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    produces the smallest file sizes but they are not human readable PCB a PHOENICS VR object type A PCB object is a 3D volume solid or fluid with non isotropic thermal conductivity See the description in the PHOENICS VR Reference Guide TR326 PCOR PIL integer name group 7 PCOR indicates which whole field store will be used for the pressure corrections in response to the command STORE PCOR See IMB1 for further information PEOPLE a FLAIR object specifying the heat source due to a number of people See the description in the FLAIR User Guide PERSON a FLAIR object specifying the heat source due to a single person See the description in the FLAIR User Guide PerspVU View Menu Photon Help PHOTON will generate the image in perspective view Phase Vector Edit Menu Photon Help Phase permits selection of the plotting of first or second phase velocity vectors Phase 1 is the default and the second phase vectors may be plotted by typing in 2 This menu button is inactive for single phase runs Phase 1 length scale formulae see EL1 Phase 2 length scale formulae see EL2 Phase 1 interface values see PHNH1A Phase 1 to interface transfer coefficient formulae see CINH1A Phase 2 to interface transfer coefficient formulae see CINH2A PHASEM PIL real flag value 13 0 group 13 PHASEM is a PATCH type used to dictate that the sources associated with the corresponding COVAL commands in group 13 will be equal to coefficient value variable value at the grid node mass of the relevant phase in the cell PHASEM is recommended for introducing gravitational and other body force fields in which case FIXFLU will normally appear in the coefficient location It ensures that the mass calculated is consistent with the other terms in the finite domain equation especially the pressure term One consequence of this is that no motion will be predicted for a fluid subjected to a uniform body force eg as in hydrostatics It is recommended for use when flow resistance resulting from fluid solid interactions are to be represented by empirically based pressure drop correlations It will ensure that the finite domain formulae will reduce exactly to the required correlation when resistance is the dominant force PHENC the abbreviation used for PHOENICS Encyclopaedia PHNH1A PIL real default 0 0 group 9 sect PHNH1A parameter used in formulae for phase 1 interface values of dependent variables phi Further parameters of the same kind are PHNH1B and PHNH1C PHOCON see CONFIG PHOENICS ENVIRONMENT This module is nothing other than the VR Editor but the name environment is used when it is desired to emphasise that buttons which appear on the Editor window can initiate many other actions than those associated with the input of simulation defining data The environment module can be activated by the commands vre or sat e In some documents for example TR 326 it is referred to as the VR Environment It may be truly said that the Satellite in environment mode competes with the PHOENICS Commander for their capabilities do overlap to some extent Since however this competition allows users to choose which they prefer CHAM sees no reason to eliminate it PHOENICS Input Language see PIL PHOENICS input file libraries see POLIS PHOENICS Overview Input libraries PHOENICS 3 see PHOENICS Overview and PHOENICS Chronicle PHS2P PIL logical group 19 sec 4 PHS2P is used for two phase cases to select the particular method used for calculating the pressure excess of the second phase See the help and encyclopaedia entries on P2 and GREX for further information PHS2PA PIL real group 19 PHS2PA is used in the calculation of the pressure excess of the 2nd phase fluid when P2 is stored See the help and encyclopaedia entries on P2 and GREX for further information PHS2PB PIL real group 19 PHS2PB is used in the calculation of the pressure excess of the 2nd phase fluid when P2 is stored See the help and encyclopaedia entries on P2 and GREX for further information PHS2PC PIL real group 19 PHS2PC is used in the calculation of the pressure excess of the 2nd phase fluid when P2 is stored See the help and encyclopaedia entries on P2 and GREX for further information PICKUP PIL logical default F group 11 PICKUP start run N from run N 1 When set T in GROUP 11 the initial fields are those resulting from the previous run in a multi run series See RUN PINCON see CONFIG PINLOG file PINTO PINTO is a stand alone code which makes it possible to transfer phi file and xyz file data from one grid to another which is coarser or finer Plane Contour Menu Photon Help Plane tells the plane where the current CONTOUR element is being plotted Plane Contour Edit Menu Photon Help The colour scale for shaded and filled contours is determined by the maximum and minimum values of the plane on which the contour is being plotted PLANE scaling is used to plot contours on a single plane where the range of values is narrow compared to the overall field range Plane No Grid Menu Photon Help Plane No specifies the plane where the current GRID element is being plotted Plane No Vector Menu Photon Help Plane No specifies the plane where the current VECTOR element is plotted PlanNo Stream Menu Photon Help PlanNo together with X or Y or Z specifies the grid plane on which the plot is to be drawn In the case of STREAMLINES it specifies the particle seeding plane PLANT was introduced into PHOENICS in 1997 so as to enable the capabilities of PHOENICS to be extended by users in any desired direction This they could of course already do by means of user programming but PLANT does the programming for them PLANT allows users to express their wishes by way of formulae typed into the Q1 file these are then converted automatically into their Fortran equivalents in a GROUND sub routine which is then compiled and built into a special executable While this is convenient for many purposes it has the disadvantage that it works only with re compilable versions of PHOENICS Nowadays therefore most users prefer to make use of the later developed In Form feature which attains the same ends without the writing of any Fortran and therefore also without re compilation In Form has rendered both PLANT and user programming superfluous but both are still available for those who prefer them Click here for documentation on PLANT PLATE a PHOENICS VR object type The PLATE object represents a zero thickness obstacle to flow which may be porous See the description in the PHOENICS VR Reference Guide TR326 PLINE PIL Graphics command The syntax is PLINE X1 Y1 X2 Y2 ICOL IDASH This draws a line between screen co ordinates X1 Y1 and X2 Y2 in colour ICOL and dash IDASH The range of screen co ordinates is 0 0 to 1 0 for both X and Y Pline Photon Help If you type in a series of points in the input window PHOTON will join them one by one with straight lines to form a multiline PLOT SURFACE a PHOENICS VR object type A PLOT SURFACE object is used to declare a surface on which contours or vectors can be displayed It has no effect on the solution See the description in the PHOENICS VR Reference Guide TR326 Point setting of see GSET P Point by point solution procedure see SOLUTN POINTS Autoplot Help PO INTS Command only active for PHOENICS restart files Forces plotting of all variables including scalars at cell faces Return to cell centre cell face operation by repeating POINTS POINT HISTORY a PHOENICS VR object type A POINT HISTORY object defines a single cell transient monitor point See the description in the PHOENICS VR Reference Guide TR326 POLIS The Phoenics On Line Information system introduced with PHOENICS Version 2 0 POLRA PIL real group 13 POLRA is used to specify the flow speed on patches with names beginning with POL for BFC cases See GXPOLR for further information Polygon Photon Help If you type in a series of points in the input window PHOTON will join them one by one and close it automatically once a line with only the single carriage return has been typed in The closed space will be filled with the current colour See also Colour PORIA PIL real group 19 PORIA is used in the specification of porosities that depend dynamically upon pressure for cells for which IZ is no greater than IPORIA See the help and encyclopaedia entries on POROSI and GREX GXHOL for further information PORIB PIL real group 19 PORIB is used in the specification of porosities that depend dynamically upon pressure for cells for which IZ is no greater than IPORIA See the help and encyclopaedia entries on POROSI and GREX for further information POROSITY Porosities are factors usually but not necessarily less than unity which multiply before they are used for convection or diffusion fluxes or for sources the east areas north areas high areas or volumes of designated cells West South and Low areas are changed automatically in accordance with what is determined for the East North and High areas of adjoining cells In order to set and use porosities it is necessary either to use the CONPOR command or to do each of the following Select an unused variable index number for each porosity needed eg EPOR 18 NPOR 19 VPOR 20 Give each a name eg NAME 18 EPOR NAME 19 NPOR etc Provide the relevant storage by the commands SOLUTN EPOR Y N N N N N etc Note that items 1 2 and 3 can alternatively be achieved by means of the keyword command STORE EPOR NPOR VPOR but the stores then taken will be the first unused ones working backwards from NPHI Set the required initial values in GROUP 11 by means of FIINIT and of PATCH with INIVAL or LINVLX etc the type and of INIT with suitable arguments If porosities are to be changed during the course of execution suitable coding must be introduced into a GROUND subroutine an example of which is subroutine GXPORA called from GREX It should be remembered that PATCH and COVAL here act in an additive manner when INIADD is T Thus if HPOR say is to equal 1 0 over most of the domain but 0 2 over a small portion of it it will be best to set FIINIT HPOR 1 0 followed by PATCH name INIVAL and INIT name HPOR 0 0 0 8 for this will subtract 0 8 from 1 0 to give the required value The same field initialization can be achieved by the following commands INIADD F FIINIT HPOR 1 0 followed by PATCH name INIVAL and INIT name HPOR 0 0 0 2 for this will overwrite 1 0 by 0 2 to give the required value Porosities can be printed out in precisely the same way as other variables viz by OUTPUT variable name Porosity factors have in the past been used for the representation of solid obstacles present in the domain cells that are full of solid material being given volume and cell face porosities of zero This practice is no longer necessary or recommended Direct use of the property marker variable PRPS being preferred See also the entries for PATCH TYPE INIADD INIT INIVAL LINVLX LINVLY LINVLZ and CONPOR for further information Porosity of east face see EPOR Porosity of high face see HPOR Porosity north face see NPOR PorosityCheck ON OFF Setup Menu PorosityChe Photon Help Porosity ON OFF where the variable VPOR has been stored PHOTON will automatically disable plotting vectors and contours within cells where VPOR 0 0 If it is required to plot within blocked cells then Porosity OFF will disable the porosity checking within PHOTON Porosity ON will restore checking Position Test Menu Photon Help Position shows the position bottom left corner of the current text string in the plotting window It can be modified by typing in the new window co ordinates See also Move in the TEXT menu POTCMP PIL logical group 19 POTCMP is used to activate for potential flows a correction for compressibility See the encyclopaedia entry on potential flows and GREX and GXPOTC for further information Potential flow Introduction Potential flow also called ideal fluid flow or irrotational flow is a mathematical concept to which real flows approximate only in special circumstances namely those in which the flow is steady viscous effects are absent and compressibility effects are small Their distinguishing mathematical feature is that the velocity field obeys the equation velocity vector equals minus grad POT where POT is a scalar called the velocity potential Combination with the mass conservation principle which states that the divergence of velocity multiplied by density if this is non uniform is zero leads to the so called Laplace Equation for POT namely div rho grad POT where rho is the local fluid density Solution by PHOENICS Equations of this kind can be very easily solved by PHOENICS for they are similar to the simplest possible heat conduction equation namely that which is valid when the thermal conductivity is uniform and heat sources are absent If therefore the statement SOLVE POT is placed in the Q1 file and appropriate boundary conditions are provided PHOENICS will generate the values of the velocity field throughout the domain From these the components of the velocity vector can be obtained by differentiation and indeed this is done automatically by PHOENICS if the Q1 also contains the statements POTVEL T and STORE U1 V1 W1 If in addition the Q1 contains STORE P1 the pressure or rather the difference of the pressure from the value of FIINIT P1 will also be automatically computed and printed Because the equation is linear only one sweep through the domain is needed provided that the whole field solver is used if NZ 1 and LITER POT is set to a sufficiently large number Examples may be found in the Input File Libraries thus case 126 which shows how to compute the ideal flow field around a plate inclined to the flow Click here to see the velocity vectors case 128 which shows how to compute the ideal flow field around a model Formula 1 racing car case 129 which shows how In Form can be used so as to define the source sink distribution which has the same effect on the flow as a solid body immersed in it Click here to see the streamlines and potential contours Compressible potential flow PHOENICS can also solve the compressible flow potential equation by making Gj a function of the local Mach number Core library case 117 provides an example Because the Mach number distribution is not known at the start an iterative ie multi sweep procedure has to be adopted The relevant PIL setting is POTCMP T and this activates calls to subroutine GXPOTC in file GXMODS F An older alternative method An alternative method is based on the analogy which exists between the potential flow equations and the equations that govern flow in a highly resistive medium The command DARCY T activates these latter equations and results in solutions for the velocity fields and the pressure The velocity potential is proportional to the DARCY pressure the constant of proportionality being the reciprocal of the resistance coefficient used in the COVALs for the velocities which by default is 1 E5 This method is less economical than solving for the potential directly because it necessitates the solution of u v w and p It is however of historical interest because it was the first method used in PHOENICS for solving the potential flow equations and it illustrates the flexibility of the PHOENICS structure Core library case 275 uses the technique and library case B514 and others show that it can be used with body fitted coordinates POTVEL PIL logical group 19 POTVEL is used to activate for potential flows the calculation of velocities from the potential gradients See the encyclopaedia entries on potential flows GREX and GXPOTV for further information POWER POWER X POWER Y Autoplot Help POW ER dir f i j The X or Y as specified by dir coordinates of elements i j will be raised to the power f SCALE will redraw the plot correctly scaled to the new values See also HELP on SHIFT MULTIPLY DIVIDE Prandtl energy model See PHENC entry Prandtl energy with prescribed length scale Prandtl mixing length model See PHENC entry Prandtl mixing length model Prandtl number a dimensionless transport property defined as the kinematic viscosity divided by the thermal diffusivity for heat transfer and the kinematic viscosity divided by the material diffusion coefficient when material transfer is in question PHOENICS allows each transported quantity to be characterized by two distinct Prandtl numbers the first relating to the laminar contribution to transport and the second to the turbulent contribution The variables expressing their values are respectively PRNDTL and PRT These variable are also used alternatively for setting the thermal conductivity when heat transfer is in question and the material diffusivity with dimensions length 2 time for mass transfer That this alternative meaning is to be used is signalled by setting the value of PRNDTL to the negative of the desired value Thus if the thermal conductivity is to be set to xxxxx the Prandtl number for enthalpy or temperature according to which is being solved for must be set to xxxxx Preliminary print out see GROUP 20 24 Prescribed effective viscosity model See PHENC entry Prescribed effective viscosity model PRESS0 PIL real default 0 0 group 9 PRESS0 parameter representing the reference pressure to be added to the pressure computed by PHOENICS in order to give the physical pressure needed for calculating density and other physical properties The use of this variable is strongly recommended in cases in which

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  • TR326: VR Object Dialog
    by the geometry file associated with that object The shape is defined by quadrilateral facets which are defined in the geometry file A large selection of geometry files is supplied as a standard part of the installation A description of the data file format is given in Creating the geometry of a Virtual Reality object All the geometry files have a dat extension The default object shape is a rectangular block which completely fills the object bounding box Other shapes can be imported from the Geometry dialog box imported from CAD or made in Shapemaker The shape page is disabled for a GROUP object Using the Supplied Geometry Libraries All the standard geometry files are kept in the directory phoenics d satell d object and its sub directories Thumbnails of these standard geometry files may be viewed here Geometry files can also be stored in the current working directory and its subdirectories These will be searched before phoenics d satell d object allowing local user created geometries to replace the standard ones Clicking on Geometry brings up the dialog box shown below Use the dialog to browse for the required geometry file The supplied geometries are divided into a number of categories with fairly self explanatory names The folder PUBLIC SHAPES contains a number of geometry primitives including cuboids cylinder cone and wedge Geometry names ending in T for example CUBET DAT denote transparent objects Geometry names starting with POL for example POLCUBE DAT indicate that the geometry is suitable for use in cylindrical polar co ordinates Custom shapes can be loaded from a CAD file using the CAD Interface button Displaying Geometry File Shapes JPEG thumbnails of all the standard geometry files are usually present in the phoenics d satell d object folder If Editor detects the presence of these files it will display them rather than the actual geometry DAT files Windows 7 and Windows Vista will display the thumbnails graphically directly In Windows XP the default is to show a list If the view is then changed from List to Thumbnails the thumbnails of the geometries will be shown Importing Shapemaker Geometry Alternatively the Shapemaker program can be used to create a wide range of shapes such as Cone a pointed cone Cube strictly a truncated pyramid the ends may be of differing size Cylinder Cylinder with spherical orifice a cylinder with optional hemisphere Cylindrical bar turn Cylindrical pipe turn a sharp corner in a bar or pipe pipe has a hole down its centre Frustum Frustum with rectangular orifice a frustum cut off with an adjustable hole on its axis Pyramid with cylindrical orifice Pyramid with rectangular orifice Pyramid with spherical orifice same shape as the cube but with different holes cut into the pyramid Ring Ring pipe a torus and a toroidal pipe Sphere Sphere with cylindrical orifice Sphere with rectangular orifice See pyramid a sphere with holes Spherical shell a hollowed out half sphere with adjustable hollowing factor Spiral Spiral pipe a long spiral with a hole down the centre in tube version T junction bar T junction pipe a T junction in 2 pipes Rectangular bar turn Rectangular pipe turn a rectangle meets another rectangle Flat spiral bar Flat spiral pipe as the spiral but with a rectangular cross section X junction bar X junction pipe two bars intersect Joukowsky Airfoil NACA 4 Digit Airfoil two air foil shapes one theoretical the other well tested Design Workshop File output from Design Workshop to convert to Facets format Perforated rectangular plate rectangular flat plate with holes in regular array Baffle round flat plate with straight edge Baffle2clips round flat plate with two opposing straight edges Nonahedron nine sided figure which looks like a house with pitched roof Cooling Tower typical 3D cooling tower shell In each case the geometry can be controlled parametrically Clicking on the Shapemaker button will launch Shapemaker The image below shows the default shape a cone From the Edit menu click Select object and select the shape from the list by double clicking on it Set the parameters as needed to get the right shape Exit Shapemaker File Exit When prompted to save the facets click Yes and enter a file name for the new geometry file Note that this will be a Shapemaker GEO file which retains the Shapemaker parameters The GEO extension is preserved in the Q1 so that Shapemaker can be used to adjust the shape parameters at a later stage if needed Loading CAD Geometries CAD generated geometries may be imported in a number of common formats Clicking on the CAD button on the Shape dialog will bring up a file browser which can be used to locate the required CAD file The interface will translate the CAD file to a PHOENICS VR DAT file This will be stored in the local working directory or alternatively in the fromCAD folder A JPEG thumbnail of the imported geometry is also created Once translated these geometries are attached to the current object and are available for use with other objects of the same shape For more details see Importing CAD Data When a CAD file is imported the full name of the CAD file is retained and is written to Q1 When the Q1 is next read a check is made to see if the equivalent DAT file already exists If it does and it is newer than the CAD file the DAT file is used If the CAD file is newer or the DAT does not exist the import process is invoked to create the DAT file Importing CAD Geometries by Group This option will only be present when creating a new object It enables several CAD geometries to be read in at one time For more details see Assembling a Complete Geometry This button will not appear when the dialog is opened for an existing object Note that multiple DAT files and mixtures of DAT and CAD files can be imported this way Applying Textures Texture

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  • Tr326: VR Environment
    is newer than RESULT This function is also accessed from the icon on the tool bar Once the above files have been saved a check is made to see if intermediate step or sweep files are present see Main Menu Output Field Dumping for information on how to save intermediate files If they are present a second dialog opens asking whether these should be saved as well As these files can be very numerous and very big it may be better to save them manually by compressing them into an archive If it is chosen to save them they will be saved to the selected folder with the names case name filename e g for case run 1 saved to folder case 1 the names would be case 1 run 1 a1 case 1 run 1 a2 etc If PARSOL is active the intermediate cut cell data files will be saved as case name pbc letter number e g case 1 run 1 pbca1 case 1 run 1 pbca2 etc If GENTRA is active intermediate GENTRA restart files will be saved as case name gphi letter number File Save Q1 File As This will save the Q1 as a new file with a different name Firstly a dialog asks if changes to the Q1 are to be saved If Save changes is ticked the Q1 on disk will be overwritten with the current setup This is the default If it is not the Q1 on disk will be used After clicking OK a file browsing window will open Select or make a folder enter a name and click Save The Q1 on disk will be copied to the new name File Save Window As This allows the contents of the main graphics window to be saved as a GIF PNG BMP or JPG format file The dialog box allows the pixel size and aspect ratio for the saved image to be selected The default resolution and aspect ratio are the same as those of the original screen image The Reset button sets the height and width to the current height and width of the graphics window The default file type is set in the Graphics section of the CHAM INI file This function is also accessed from the icon on the tool bar Note that if Use virtual screen is ticked the area of the main graphics window is captured without any overlying windows and without the surrounding window frame and toolbars If the hand set is moved to lie over the main graphics window it will not be included in the saved image If Use virtual screen is unticked the entire window together with frame toolbars and any overlapping windows will be captured The image will be saved with whatever background colour has been set from Options Background colour The default folder is the current working directory Users wishing to save in PCX format should add pcx to the file name entered and a pcx of that name will be saved File Print This allows the contents of the main graphics window to be sent directly to any available printer device The dialog box allows the printer number of copies and other print options to be selected This function is also accessed from the icon on the tool bar The image will be saved with whatever background colour has been set from Options Background colour File Exit This exits from PHOENICS Before the program closes down a prompt to save the current work will be given File Quit This exits from PHOENICS without saving any files PHOENICS VR can also be exited without saving by clicking on the Close window icon in the top right corner of the main graphics screen Settings Menu The Settings menu consists of the following items Domain Attributes Probe Location Add Text New Object Attributes Find Object Datmaker Operations Editor Parameters View Direction Near Plane Rotation speed Zoom speed Depth effect Adjust lighting Settings Domain Attributes This brings up the Main Menu It is equivalent to the Main Menu button on the hand set or double clicking the DOMAIN object in the Object Management Dialog Settings Probe Location In the Editor the probe location defines the location in the model domain which will be used to monitor the progress of the solver solution It is represented visually in the domain as The probe location dialog allows the user to locate the probe either using physical units within the domain or via cell location Set view centre will set the view centre of the image to the current probe location thus centering the image on the probe The Parameters tab is described under Settings Editor Parameters Settings Add Text This option can be used to place up to twenty lines of text on to the main graphics window To create a new text object select Add from the Text menu This will open the Text Properties dialog shown below Each line of text may be up to 80 characters in length The text may be placed in the window either by specifying a pixel location or by clicking the left mouse button over the desired location The Attributes menu may be used to change some of the attributes of the text eg colour The font used for the text will be that specified by the Choose Font item on the Options menu Note The text is not saved to Q1 so is lost on exiting the VR Environment In the Viewer text items are saved to a macro Settings New There are five options New Object creates a new object and displays the object dialog for the newly created object It is equivalent to clicking on Object New New Object in the Object management Dialog reached from Object button on the hand set or the icon on the toolbar Import CAD Object Creates a new object and opens the CAD Import dialog for it Import CAD Group Opens the Group CAD import dialog which allows a number of CAD files to be imported in one action Each CAD file specified will create a new object Import Object displays a file browser with which a pre existing assembly POB file can be selected for import New objects are generated for each object in the assembly and the object dialog for the first object in the assembly is displayed Clipping plane creates a new Clipping plane object Plotting Surface creates a new Plot surface object Settings Object Attributes This brings up the object dialog box for the currently selected object It is equivalent to double clicking on an object If no object is already selected the Object Management Dialog showing a list of all objects will be displayed Settings Find Object This brings up the Object Management Dialog The selected object if any becomes the current object and is high lighted in the list of objects Settings Datmaker Operations This brings up the Datmaker Operations dialog which allows various operations to be carried out on one or more objects If no object is pre selected then the domain CHAM will be displayed in the the first line and the listbox will be empty The first object may be selected either by clicking on an object in the domain or by selecting one from the pulldown list For a single object the following repair operations are available Do Hole Mend the facets defining the shape of an object should make a complete closed volume This attempts to identify any missing facets and to fill the resulting hole with new facets Folds sometimes the facets in a geometry may be folded over each other leading to problems in detection at the solution stage This attempts to identify such facets and replaces them with unfolded facets Consistent the facets making up a closed volume must all face outwards Sometimes some facets point inwards again leading to detection problems This attempts to ensure that all facets point the same way and that all point outwards Split into closed volumes this will identify each separate closed volume within the geometry and will output a separate dat file for each These are then imported as a CAD Group with all attributes copied from the original object The original object is changed to a NULL object and all the new objects are set not to affect the grid in order to keep the mesh the same Split into CAD entities this will identify each separate CAD entity within the geometry and will output a separate dat file for each These are then imported as a CAD Group with all attributes copied from the original object The original object is changed to a NULL object and all the new objects are set not to affect the grid in order to keep the mesh the same Note that the more repair processing is selected the longer the repair may take Once a first object has been selected and Object changes is ticked then a list of compatible objects will appear in the Other objects listbox for an object to be considered compatible it must be of the same Object Type eg BLOCKAGE and have the same Material Property as the first Several objects can be selected using standard Windows selection techniques The following operations can then be performed Union Performs a complete Boolean union between two or more overlapping objects to create a single object Merge Joins coplanar faces of two or more objects to create a single object Can be quicker than Union if object faces are truly coplanar i e just touch with no overlapping After a Union or Merge operation a new object is created with size and position set to just encompass all the merged objects The original objects are all reset to NULL and the new object is set to not affect the grid in order to keep the mesh the same Difference two objects this subtracts the second object from the first e g to create a channel through a solid object by subtracting another representing the fluid A new object is created with size and position set to that of the first The original objects are set to NULL and the new object is set to not affect the grid in order to keep the mesh the same The user can provide a filename for the modified object geometry the initial default being mergedgeom dat but if this already exists then the name will increment to mergedgeom 1 dat etc The default is to save any changes to the q1 before carrying out the selected operations This Q1 is copied to another name the initial default name being saved q1 but if this already exists then the name will increment to saved 1 q1 etc This enables the user to revert to the pre operations Q1 if necessary Settings Editor Parameters The VR Editor Parameters menu sets the Increment size and Scale factors Increment controls the increment in size or position each time the Size up down or Position up down buttons on the hand set are pressed It also controls the incremental movement of the probe There is a separate increment size in each coordinate direction defaulted to give approximately 100 steps to cross the domain This can be useful if the domain dimensions are very different in each direction Snap to grid when ticked forces the size and position of objects and the probe position to be exact multiples of the increment size when the up down arrows are clicked When not ticked the default the size and position will change by the increment from the current size position Note that this function applies to the Size and Place tabs of the Object dialog not the hand set Exact values can always be typed in The scale factors control the relative scaling of the entire geometry If the aspect ratio of the domain is extreme say the domain is 100m 1m 100m it is very difficult to visualise the domain properly It can also be difficult to select objects as one of their dimensions will be very small In such a situation setting the scale factors to 1 20 1 would make the domain appear to be 100 20 100 The Probe tab is described under Settings Probe location Settings View Direction This option leads to the Reset View Parameters dialog which is described in the section Reset View Parameters Settings Near plane Parts of the image closer than the near plane are not visible The default setting ensures that the entire image is visible The near plane can be moved interactively by sliding the slider on the dialog box The dialog can remain open without interrupting other activities Reset restores the default value Image INCREASED NEAR PLANE Rotating and zooming the image will expose or hide different parts of the geometry The introduction of 3D clipping plane objects has reduced the need of using the near plane for exposing parts of the geometry Note that the backs of the exposed facets are transparent To make them solid click on View Show back of objects Image INCREASED NEAR PLANE with visible backs Note that setting the Near Plane to too small a value can lead to a phenomenon known as Z Fighting where two coplanar polygons cannot be drawn cleanly as shown in this example from Wikipedia Settings Rotation speed Rotation speed controls the speed at which the image rotates in response to the rotate and move buttons on the hand set or mouse movements The rotation speed can be changed interactively by sliding the slider on the dialog The dialog can remain open without interrupting other activities Reset restores the default value Settings Zoom speed Zoom speed controls the rate at which the image gets bigger or smaller in response to the hand set zoom buttons or mouse movements The zoom speed can be changed interactively by sliding the slider on the dialog The dialog can remain open without interrupting other activities Reset restores the default value Settings Depth effect Depth effect controls the degree of perspective visible Another way of controlling this is the Angle Up Angle Down button pair Image Large depth effect Image Small depth effect The depth effect can be changed interactively by sliding the slider on the dialog The dialog can remain open without interrupting other activities Reset restores the default value Settings Adjust light Adjust light controls the illumination of the scene Light ambient Turns the ambient light on and off The intensity controls the amount of lighting effect applied to all objects regardless of the light source position An ambient light of zero means that areas unlit by the diffuse light source receive no lighting at all and are entirely black while areas lit by the diffuse light source get only the effect of that light Larger values produce more lighting effect in areas not lit by the diffuse light source making these areas show some of the surface color An ambient light of 100 means that all areas are lit by the maximum amount and areas unlit by the diffuse light source use the full surface color Light diffuse Turns the directional light on and off The intensity controls the amount of lighting effect produced by this light source An intensity of 100 produces the maximum contrast between lit and unlit areas and fully lit areas use the full surface color Lesser values produce less contrast between lit and unlit areas and fully lit areas use darker colors An intensity of zero means the light source produces no contrast between lit and unlit areas and all areas are black Light specular Turns specular highlights on and off for all light source shaded objects in the plot Specular Highlighting adds the semblance of reflected light to 3D shaded or flooded objects The intensity controls intensity of specular highlights that is the amount of reflected light which controls the amount of whiteness at the peak of the highlight Light source location The light source is attached to the domain so the lighting does not change as the domain is rotated The upper slider moves the light through 360 in the X Y plane and the lower slider through 360 in the Y Z plane When both sliders are at zero at the left end the light shines straight down the Y axis Secondary opposing light source Turns on and off a second light source directly opposite to the main light source This lights the back of the model giving a fairly uniform illumination View Menu The View menu contains the following items Control Panel Movement control Toolbars Status bar Text box Show back of objects Window size View Control Panel This controls whether the object and domain hand set is visible or nor The hand set can be closed by clicking on the close window icon in the top right corner This may be required for example in order to get an unobstructed full screen image Once closed the hand set can only be restored from this menu When the hand set is closed additional buttons appear on the toolbar in order to maintain functionality View Movement control This controls whether the movement hand set is visible or nor The hand set can be closed by clicking on the close window icon in the top right corner This may be required for example in order to get an unobstructed full screen image Once closed the hand set can only be restored from this menu When the movement hand set is closed the mouse control is automatically activated View Tool bar This controls which parts of the toolbar appear at the top of the graphics screen The toolbar can be used to replace the functions of either hand set The general toolbar contains the file handling icons and also displays the name and type of the currently selected object If no object is selected it will display the name of the domain usually set to CHAM The domain toolbar contains icons connected to the domain including the probe and Main Menu The Object toolbar contains icons connected with object management The Movement toolbar contains the movement icons from the Movement handset All displays all the currently available portions of the toolbar The tool bar is automatically turned off if the BFC mesh generation menu is entered View Status bar This controls whether the status bar along the bottom of the graphics image is visible or not If it is turned off it will not appear in the images saved by File Save window as View Text box This controls whether the Satellite command prompt should be visible or not If a Q1 being loaded into the VR Editor requires a response from the user or if errors are detected reading the Q1 file the Command prompt will be automatically made visible regardless of this setting View Show backs of objects By default the facets defining the objects are only drawn single sided If holes appear it is likely that some facets are pointing the wrong way and the object is not valid If the Near Plane setting or a Clipping Plane object has been used to cut away part of the geometry then again the transparent backs of some facets will be exposed To make them appear solid toggle the tick mark next to Show backs of objects View Window size This causes the current window size to be displayed at the right hand end of the Status bar at the bottom of the screen Run Menu The Run menu consists of the following items Pre processor Parallel Solver Solver Post processor Utilities Pre processor The Pre processor sub menu contains the following items GUI Pre processor VR Editor Text mode Satellite Fortran creator Plant Menu CHEMKIN Interpreter Run GUI Pre processor VR Editor This option is grayed out when the VR Editor is active In the VR Viewer it is the way to switch to the VR Editor Run Text mode Satellite This will run the PHOENICS Satellite using the Q1 file in the current working directory Talk T runs Satellite in interactive mode Talk F runs Satellite in silent mode The Q1 is read the input file for Earth EARDAT is written and Satellite exits with no interactive session This mode is suitable for advanced users who are making all their changes by hand editing the Q1 input file Run Fortran creator Plant Menu The PLANT menu is a graphical environment for the creation of Fortran code which is linked into the Earth Solver Expressions are provided in algebraic form for physical properties source terms specialised output PLANT turns these expressions into error free Fortran Full on line help is available within the PLANT menu To create the new Earth executable and run it Click Options Run Version select Earth and then Private Click Run Solver The PLANT specified coding will be generated and the compilation linking process will happen automatically Run CHEMKIN Interpreter This forms part of the interface between PHOENICS and CHEMKIN2 It runs the CKINTERP program which transforms the mechanism file ckm into the CLINK and TPLINK files required by CHEMKIN Parallel Solver The Parallel Solver option will only appear if the installation has the appropriate license file When the item is chosen a dialog will appear from which the number of processes to be started on the current machine can be chosen or an MPI configuration file can be selected The dialog box provides the user with an option to select up to 64 processes in steps of 2 If the number required is not in the pull down list it can be typed into the box If the parallel run is to use processors which are located within a cluster of PCs a list of available hosts must be provided Local only restricts the run to processors physically on the local host machine typically the four processors of a quad core PC Any allows access to all machines on the local cluster and Specify in list allows access to specified machines only When this is selected Machine list browses for a text file with a lst extension containing a list of machines and Add adds the specified machine to the list Use MPI configuration file allows the specified configuration file to be used to set the processors to be used The splitting of the domain between the processors domain decomposition can be Automatic the default or Manual When set to Manual the numbers of subdivisions in the X Y and Z directions are saved to Q1 as IG 1 IG 2 and IG 3 respectively and LG 2 is set T to indicate manual decomposition These settings are made in Group 19 of Q1 Note that the total number of processors specified manually IG 1 IG 2 IG 3 must match the number set in the Number of processes box otherwise the solver will display an error message and the run will not continue Solver This will run the PHOENICS Earth solver on the user s own computer using the EARDAT file in the current directory VR Editor will write out a new Q1 and EARDAT before starting the Earth run Normally the PUBLIC or CHAM supplied Earth will be run If GROUND coding has been created either by using the PLANT menu or by hand editing GROUND HTM or GENTRA HTM the local or PRIVATE executable will have to be run From the Options menu select Run Version then Earth then Private Whenever GROUND HTM or GENTRA HTM are newer than the local Earth executable EAREXE EXE there will be a prompt to re compile and re link before running PLANT will re generate GROUND HTM every time so if no changes have been made time can be saved by choosing not to recompile and re link Post processor The Post processor sub menu contains the following items GUI Post processor VR Viewer Text mode Photon X Y Graph plotter Autoplot Run GUI Post processor VR Viewer This will run the VR Viewer If The VR Viewer is already running this item will be grayed out In the Viewer press F6 to plot new files but keep all the view settings Run Text mode Photon This will start the PHOTON visualisation program PHOTON can be switched between a Windows version and the original from Options Run Version Run X Y Graph plotter Autoplot This will start the AUTOPLOT X Y graph plotting program AUTOPLOT can be switched between a Windows version and the original from the PHOTON entry in Options Run Version Utilities The contents of the Utilities sub menu are read from a configuration file phoenics d allpro phoesav cfg and may be customised either by CHAM prior to delivery or by the user after installation The menu may contain some or all of the following items AC3D Shapemaker SimLab Composer GENTRA track unpacker TECPLOT translator PINTO ParaView USPGRID PHO2VTK Run AC3D This will run the AC3D program a program for creating shapes for use in the VR Editor It can also be used to import and repair STL and some DXF files from CAD Run Shapemaker This will start a stand alone interactive program which generates shapes for use in the VR Editor The same functionality is accessible from the Shape tab of the Object Specification dialog Run SimLab Composer SimLab Composer from SimLab Soft is a 3D scene building rendering sharing and animation application It is shipped with PHOENICS and is used silently to convert many CAD formats to the PHOENICS DAT format This item runs SimLab Composer interactively allowing the user full access to all its capabilities All that is needed is an unlocking request to be made to CHAM which holds a number of SimLab licence strings Run GENTRA track unpacker This will run the GENTRA unpack program which extracts individual particle track histories from the track file GHIS This is no longer needed as in general the Viewer can plot all the tracks directly from GHIS TECPLOT translator standalone This will start the stand alone interface between PHOENICS and the TECPLOT visualisation program from Tecplot Inc The interface will read a named PHOENICS PHI and XYZ for BFC file and produce a TECPLOT TECDATA DAT file It does not produce a geometry file and does not take account of PARSOL cut cells TECPLOT output files including model geometry are also created by the Editor and Solver when TECPLOT is selected under Options Additional interfaces This is the preferred way of generating TECPLOT output IGES reader This starts a program which reads an IGES file and translates points lines arcs and splines into PHOENICS BFC mesh generation commands PINTO PHI Interpolator This starts the PINTO interpolation program It reads in a PHI file and interpolates it onto a different grid Further information on how to operate PINTO can be found in the Encyclopaedia ParaView This starts the ParaView post processor available for free download on the web Run USPGRID This starts the Unstructured PHOENICS mesh generator in standalone mode It is run automatically whenever an Earth run is to be made but this allows it to be run at any time Run PHO2VTK This starts a standalone program which converts the PHOENICS output file PHI or PHIDA to a VTK file for use with ParaView Options Menu The Options menu contains the following items Solver monitor options Run version Select Private Solver Change working directory PHOENICS Environment Setting Use PQ1 Editor File format Hardware Acceleration Change font Background Colour Clear Textbox content Additional Interfaces Options Monitor options The Solver Monitor options menu brings up a dialog box which controls the Earth graphical convergence monitor ISG50 can be unset 0 enforce endpause 1 or turn off endpause 2 ISG51 can be unset 0 enforce figures 1 or turn of figures 2 ISG52 can be unset 0 maximum and minimum values 1 max abs corrections 2 or spot value 3 Note that the above three settings are also on the Main Menu Output panel and that when first two are Unset the function can be controlled by Pause and Figures below Rolling monitor width When set greater than zero the monitor screen will continuously show the last n sweeps Save all 3 monitor views When ticked images of all three convergence plots spot value and residual maximum correction and nett source and maximum and minimum value in the field will be saved at the end of the run Pause determines whether Earth will wait at the end of a run with the convergence monitoring information on screen for END DUMP or ABORT to be pressed before writing out the RESULT and PHI files or whether it will automatically write all output files and close down with no user intervention It can be useful to turn pause on for long over night runs Figures determines whether the numerical values of the convergence plots are displayed or just the graphs For very coarse grids the time taken to update the numbers may be a considerable fraction of the elapsed run time Sweep determines whether the current sweep iteration number is displayed Spinner determines whether an activity indicator is displayed between screen updates during big runs This will give some impression of whether anything is happening or whether Earth has crashed However the CPU overhead can be significant Timer determines whether the elapsed time and estimated total run time are displayed Z planes is used in 3D cases to determine whether to display the current IZ plane number Line thickness sets the width in pixels of the line used to draw the convergence monitor curves All the monitor options settings are held in the CHAM INI file which can be edited from File Open file for editing Options Run version The Run version menu leads to the dialog boxes below These allow the choice between Public Private and Prompt for Satellite and Earth Public means run the executable located in the default locations These are normally the files supplied by CHAM Private means run the executable built in the local working directory Prompt means select between Public and Private each time the executable is run See also the Compile and Build menus for information on creating private executables Note that if the private executable is chosen and GROUND HTM or MAIN HTM or GENTRA HTM are newer than EAREXE EXE the choice will be offered of re compiling and re linking If the answer is No the existing EAREXE EXE will be run PLANT will re create GROUND HTM each time EARTH is run If no changes have been made to the PLANT settings considerable time can be saved by not re building For Photon the choice is between Photon and WinPho Photon is the original version of the text mode post processor WinPho is a new Windows version Options Select Private Solver This option allows the user to select any named executable to be used as the PHOENICS solver thus avoiding the necessity of having to have the private solver in the local directory The name of the private solver is then saved to the file Phoenics cfg at the end of the session Options Change working directory This allows the working directory be changed The current working directory is displayed in the status bar at the bottom of the main graphics window and as the starting point on the dialog Browse to the required directory then double click on the folder icon or click OK If the VR Editor is active it will read the Q1 if any in the new directory Options Phoenics Environment Setting The Phoenics environment variable is used when Phoenics has not been installed in the root directory Any changes here are not made permanent and only persist for the duration of the session and are reset when the users leaves the VR environment Options Use PQ1 Editor The default file editor is the PQ1 Editor It is very similar to Notepad but has many features to aid editing the PHOENICS input file Q1 If the option is unticked Notepad will be used instead Options File format This allows the choice between sequential and direct access format for the PHI and XYZ files Direct access PHIDA XYZDA files will give faster access in Earth Photon and VR Viewer They may also be smaller depending on the relative sizes of the grid and physical record length They are not however portable between different computer platforms These settings are held in the PREFIX file This can be edited from File Open file for editing The direct access record lengths are set in CONFIG Note that if the CONFIG file is changed the CONFIG setting at the end of PREFIX should be changed to CONFIG config otherwise the changes will not be picked up Options Hardware Acceleration When ticked the graphics card hardware acceleration feature will be active When not ticked it will be turned off On some computers turning the hardware acceleration off can eliminate graphics artifacts such as grey blocks where dialogs used to be or Viewer contour scales not being redrawn after a rotation This setting will over ride any global settings made in Windows dialogs It is held in the CHAM INI file in the FTN386 section This file can be edited from File Open file for editing Options Change font This allows the font font weight and font size used to be changed A list of available fonts is presented The new font will be used the next time an object dialog box the Main menu or a Text item is displayed The font information is held in CHAM INI which can be edited from File open file for editing The default font is Courier new The System font also works well The dialogs are designed to work best with fixed pitch fonts Note that the Font style Italic setting is ignored If a dialog is so tall that the OK button at the bottom is not visible reducing the font size by one or two point sizes will make it visible again Options Clear textbox contents This deletes the contents of the Text Box Options Background Colour This opens a dialog which allows the background colour of the VR Editor VR Viewer main graphics window to be set The RGB values of the chosen colour are saved in a local copy of the CHAM INI file This file can be edited from File Open file for editing The extract which sets the background colour is shown below FTN386 VR Background iRed iBlue iGreen where iRed iBlue iGreen are the Red Blue and Green indices on a scale of 0 255 0 0 0 is black and 255 255 255 is white 222 222 222 produces a grey background The names black 0 0 0 white 255 255 255 blue 0 0 255 green 0 255 0 red 255 0 0 and navy 0 0 128 are also recognised as VR Background settings If the VR Background line is missing or incorrect black is assumed If a white or light colour background is chosen the text colour will be black For darker background colours the text colour will be white When images are saved to a file File Save Window As or sent to the printer File Print the current background colour will be used as the background colour Additional Interfaces This leads to additional output interfaces Additional TECPLOT Output Additional Fieldview Output Additional VTK Output Additional STL single file Output Additional individual STL Output Additional TECPLOT Output When selected additional output files in Tecplot format are written by the Editor and the Solver In total three files are involved TECGEOM DAT containing the geometry and PHOENICS MCR a macro are written by the Editor TECDATA DAT containing the solution is written by the Earth solver The data files written are compatible with Tecplot 10

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  • What's new in PHOENICS August 2007; TR 006
    shape Save as a case and Open existing case save and restore intermediate step sweep files In Flair HOTBOX the file holding the fan characteristics curves can be edited directly from within the interface In Flair HOTBOX the list of fans present in the fan data file is presented as a selectable list In Flair there are two sight length variables for weakly reflective and light emitting objects Point history object can select which variable s to create time history information for Changes to the Earth Solver When PARSOL and GENTRA are active together the particles will bounce from the true facetted surface of the object Previously they bounced from the underlying fully blocked cells which could give rise to spurious reflection The calculation of forces and moments on blockages has been extended to non facetted objects those which use cube dat as a geometry file In addition more control has been added so that the user can select which objects are included or excluded from a global summation of force and moment The drag and lift coefficients can also be printed if the user supplies normalising areas The calculation of forces and moments is correct for cylindrical polar coordinates

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  • ANGLED-IN and ANGLED-OUT objects
    created These allow inlets and outlets to be placed on the outer surface of any arbitrarily shaped blockage The active Inlet outlet area is the area of intersection of the ANGLED IN OUT object with any blockage object In the image below a cylindrical ANGLED IN object is intersecting a quarter cylinder blockage The inflow can be specified as Cartesian velocity components as above velocity normal to the blockage surface

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  • Domain-partitioning via transfer objects
    by In Form number of cells in X Y Z direction 1 20 1 X coordinates of the cell faces 0 000000E 00 1 000000E 02 Y coordinates of the cell faces 0 000000E 00 1 000000E 02 2 000000E 01 Z coordinates of the cell faces 0 000000E 00 1 000000E 00 Field Values of P1 7 947696E 04 1 147313E 03 6 130185E 04 Field Values of U1 6 805007E 02 9 728204E 02 9 946590E 02 Field Values of V1 1 206840E 03 1 995379E 03 0 000000E 00 Field Values of H1 5 355338E 01 9 021159E 01 1 000000E 00 Field Values of C1 8 131076E 01 2 500963E 01 8 074208E 12 It is the first part of the transfer object file which corresponds to that of the POB file Here such parameters are described as a position size of transfer object number and coordinates of vertices number of facets facet connectedness and colour In the second part after data derived by In Form the parameters characteristic only for transfer objects are listed Each new line begins with symbol which is interpreted by Satellite as a beginning of the comment The numbers of cells in X Y Z direction are specified as integers after the appropriate comment Further the coordinates of cell faces are listed as reals consistently in X Y Z direction The number of coordinates in each direction is equal to the number of cells plus 1 Further the fields of all dependent variables follow as reals after the line Field Values of where stands for the appropriate variable name The field of the variable P1 contains the mass flux values The fields of other variables contain values of these variables near to the transfer object surface Number of values in each field equal the number of cells in the transfer object 3 Simple examples 3 1 One dimensional heat conduction Input file library case 855 concerns heat conduction in the z direction The low wall is held at zero temperature while a fixed heat flux is applied at the right hand end The grid which extends also in the y direction is divided into two parts but provision is made for the values of NY to differ in the two parts low high wall 1st part 2nd part wall y z direction The calculation for each part is executed in a separate run Transfer object TROB1 for the high boundary is created at the end of the first run by means an In Form export statement The second run applies this information to its low boundary by reason of an In Form import statements and then creates its own export object TROB2 at its high boundary 3 2 Two dimensional flow in channel Input file library case 856 concerns convective heat exchange and mass transfer in a channel The inlet flow is uniform The north and south walls have uniform temperatures A point source of concentration is set in the first

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  • What's new in PHOENICS June 2006; TR 006
    as well as for plates By setting the surface velocity a range of cases involving steady movement can be treated as steady state In Cartesian co ordinates there is a Spin option which sets the surface velocity as if the object were rotating about its axis In Polar the slide velocity can be in m s or rad s The following image shows a bar being pulled at constant speed through a Polar domain The input for multiple STL import is now taken from a multiple file selection dialog not from a list file as previously For MOFOR the MOF files controlling the motion can be created and edited directly from the Sources page of the Main menu The Editor can output the entire geometry in TECPLOT format Each object is shown in TECPLOT as a zone A TECPLOT macro is also written which sets common flags and performs common data manipulation such as calculating absolute velocity and performing Cartesian polar transformations In total 3 files are involved TECGEOM DAT containing the geometry and PHOENICS MCR the macro are written by the Editor TECDATA DAT containing the solution is written by the Earth solver The image below shows the geometry for an offshore platform approximately 120 objects exported to TECPLOT 10 Changes to the Earth Solver When PARSOL is active the cut cells are calculated properly for polar geometries For buoyancy driven flows the effect of buoyancy on turbulence can be significant In stably stratified flows such as smoke layers turbulence can be damped Conversely in the vicinity of plumes the turbulence can be enhanced These effects are implemented in the K e models via an additional source term The choice between stable or unstable stratification was previously made by setting a constant to 0 0 or 1 0 and so could never be universally correct An auto function has been introduced which switches between the stable and unstable forms depending on the local flow direction This should produce better results for cases with zones of both stable and unstable stratification The auto option is now the default for new cases set via the Editor but constant values can still be set from the Main Menu Sources panel The solution can be output in TECPLOT format An output file TECDATA DAT containing two TECPLOT zones for each PHOENICS domain is written One zone is contains data at the cell centres adjusted for PARSOL cut cells and one contains data at the cell corners The first is better for plotting vectors the second for plotting contours and iso surfaces The image below shows the geometry and solution from Library case V146 displayed in TECPLOT 10 Domain partitioning via Transfer objects The domain partitioning technique is useful for computer simulation of flow phenomena characterised by a predominant direction of flow as for example when several chemical plant vessels are connected in series as sketched below the flow being always from left to right vessel 1 vessel 2 vessel 3 upstream direction of

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  • Chapter 1: The PHOENICS object concept
    from the beginning but better late than never The new practice is especially useful when the objects are characterised in practice by rather few parameters which may well remain the same from case to case such as a perforated floor tile which has an unchanging flow versus pressure drop relation and is nearly always placed horizontally a standard size electronic equipment cabinet which always stands upright and is mainly characterized by its heat source or a standard size wall mounted heating panel which is mainly characterised by the temperature at which it is maintained Section 1 2 New thinking about objects and patches Changes of language assist changes of thinking Therefore the concept of the Phoenics Object file with the extension POB has been introduced Although in fact dat and pob files are treated in the same way by the PHOENICS satellite the former name is preferred for the old style geometry only files of which there are very many while the latter is ascribed to any file of which there are still rather few which contains non geometric attributes in addition The pob file is not the first to contain both geometric and non geometric information for the geo file produced by the Shapemaker modules did the same Moreover whereas the VR Editor could work only with imported shapes Shapemaker could create them AND assign attributes to the associated objects In order to simplify the user s task it has been decided to combine the capabilities of both the VR Editor and Shapemaker so that if the required shape already exists the appropriate dat file will be imported if it does not Shapemaker will be called on to make it even during the VR Editor session required non geometric attributes will be added by way of either Shapemaker or the VR Editor menus as the user finds convenient the resulting Phoenics Object will be stored for future re use in a POB file There have been other changes in thinking which are gradually taking effect One of these is the lessened tendency to attach patches to objects The reasons for the tendency and its lessening are as follows In the early days of PHOENICS PATCHes with their associated COVALs presented the only means of introducing initial and boundary conditions Thus if a solid rectangular grid fitting object was to be represented one initial value patch would be used so as to specify the material index i e PRPS value of each cell within the block Then six additional wall type patches would be created one for each surface to express the frictional influence of those surfaces on the flow This practice has been unnecessary for many years for the EGWF i e earth generated wall function feature enables the frictional influence to be deduced simply from knowledge of which cells contain fluid and which solid A related early days notion is the supposition that if the just specified rectangular object also provided a source of heat a distinct patch

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