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  • WORKSHOP - Transient Heat Conduction
    material properties Click on Properties Click on the button next to The current domain material is Select Solids from the list of material types then Steel from the list of solids Set the Initial temperature Click on Initialisation Set the FIINIT value for TEM1 to 10 Set the solution control parameters Click on Numerics Set the Total number of iterations to 50 This is the number of iterations sweeps performed on each time step Set the output parameters Click on Output then on Settings next to Field dumping Set the intermediate field dump step frequency to 1 Leave the other settings at their defaults This will instruct the Earth solver to create a special output file in which the Z axis is time and each Z plane is the X Y solution at that time Click on Previous panel Top menu and then on OK Click Reset on the Movement control panel then Fit to window to re scale the view to fit the geometry Use the View down button on the handset to rotate the image so that you are looking at the X Y plane Create the Hot end Click on Settings New and New Object Change name to HOT Click on Size and set SIZE of object as Xsize 0 0 Ysize 0 01 Zsize 0 005 Click on Place and set POSITION of object as Xpos 0 0 Ypos 0 0 Zpos 0 0 Click on General Change the Type to PLATE Click on Attributes then on Adiabatic Select Surface temperature from the list of heat sources Enter 100 as the Value Click on OK to exit the Attributes dialog and on OK to exit the Object specifications Dialogue Box Create a temperature probe Click on Settings New and New Object Change name to PROBE Click on Size and Set SIZE of object as Xsize 0 001 Ysize 0 001 Zsize 0 005 Click on Place and Set POSITION of object as Xpos 0 09 Ypos 0 006 Zpos 0 0 Click on General The change the Type to POINT HISTORY Click on OK to exit from the Object Specifications Dialogue Box Running the Solver In the PHOENICS VR environment click on Run Solver Earth and click on OK to confirm running Earth Using the VR Viewer In the PHOENICS VR environment click on Run Post processor then GUI Post processor VR Viewer Viewer Click No next to Use intermediate files to toggle to Yes then click OK to read the file Click on Settings then Editor parameters Set the Z scale to 0 00008 remove one zero from the default setting Set the Snap Size to 0 000001 otherwise the Probe will move too far for each click on the probe position buttons Select temperature as the plotting variable and turn the Contours on Note that the Z axis now represents time not distance Contours in the Z plane show the temperature distribution at a point in time Contours in the Y plane show time

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/wstrn1.htm (2016-02-15)
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  • WORKSHOP - Abrupt Rupture of a Diaphragm
    LAMINAR Set the material properties Click on Properties Click on the button next to The current domain material is Select Gases from the list of material types then Air using Ideal gas Law from the list of gases Note that by default the reference pressure and temperature are set to 1E5 bar and 273K respectively Set the Initial temperature Click on Initialisation Set the FIINIT value for TEM1 to 23 Set the solution control parameters Click on Numerics Set the Total number of iterations to 50 This is the number of iterations sweeps performed on each time step Set the output parameters Click on Output then on Settings next to Field dumping Set the intermediate field dump step frequency to 1 Leave the other settings at their defaults This will instruct the Earth solver to create a special output file in which the Z axis is time and each Z plane is the X Y solution at that time Click on Previous panel Top menu and then on OK Click on the Reset button then Fit to window to update the view Use the View down button or mouse click on Mouse button first on the handset to rotate the image so that you are looking at the X Y plane Create the High Pressure end Click on Settings New New Object The Object specification dialog box will appear Change name to HIGH P Click on Size and set SIZE of object as Xsize 0 1 Ysize 0 1 Zsize 0 1 Click on Place and use the default settings as Xpos 0 0 Ypos 0 0 Zpos 0 0 Click on General The Type is Blockage default Click on Attributes then on Other materials Select domain material Click on Initial values Set the initial pressure to 1E5 relative to 1E5 Click on OK twice to exit the Attributes menu and on OK to exit the Object specification Dialogue Box Create probes Click on Settings New New Object Change name to PROBE Click on Size and set SIZE of object as Xsize 0 005 Ysize 0 005 Zsize 0 1 Click on Place and set POSITION of object as Xpos 0 18 Ypos 0 05 Zpos 0 0 Click on General The change the Type to POINT HISTORY Click on OK to exit from the Object Specification Dialogue Box Click on the Duplicate object button on the hand set and OK to confirm Use the X Y position down button on the main control panel to move the duplicate object to XPOS 0 1 YPOS 0 05 Click on the PROBE object to select it Click on the Duplicate object button on the hand set and then OK to confirm Move the duplicate object to XPOS 0 02 YPOS 0 05 Running the Solver In the PHOENICS VR environment click on Run Solver Earth and click on OK to confirm running Earth Using the VR Viewer In the PHOENICS VR environment click on Run Post processor then GUI Post processor

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/wstrn2.htm (2016-02-15)
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  • WORKSHOP - BFC (1) Points and Lines
    domain size creating and managing Points creating and managing Lines creating and managing Surfaces creating and managing Volumes deleting unwanted entities managing the display The input and modification of POINTS is often easier if the view direction is normal to the plane the points are to be created on We want to create points on planes of constant Z so change the view to be along the z axis by clicking the View down button on the Movement control panel and keeping it pressed until the view is more or less along Z with Y pointing up and X to the right To ensure that the axis orientation is absolutely as desired click the Reset button to jump the view to be along the nearest axis For this Tutorial we are going to specify two sets of points the pentangle at z 1 and the circle at z 0 We now create the required shape at z 1 first by generating points and then connecting them together with lines To generate points click the Points button then New points then Type x y z A dialog will appear which allows the exact co ordinates of the point to be typed in with the keyboard The units of the co ordinates are metres Create five points with the following co ordinates Point name X co ordinate Y co ordinate Z co ordinate P1 0 0 0 0 1 0 P2 1 0 0 0 1 0 P3 1 2 0 7 1 0 P4 0 5 1 2 1 0 P5 0 2 0 7 1 0 After entering the data for each point click Apply to create the point and keep the dialog open for the next point After entering the data for point P5 click OK to create the point and close the dialog The screen should look like this when creating point P4 Click OK twice to get back to the BFC Menu dialog Having specified the points create the lines to join the points together For this particular geometrical plane only straight lines are required these are generated by clicking the Lines button then New lines then New Straights Click on point P1 It will be highlighted in red to confirm selection Select point P2 Line L1 is generated The names of the lines are automatically generated by the grid generator and are L1 L2 Ln Now generate the other lines at z 1 by clicking on points P2 and P3 P3 and P4 P4 and P5 and finally P5 and P1 At this point the screen should look like this Click OK twice to get back to the BFC Menu dialog Now create the points and lines at z 0 The circle will be made up of four arc segments Each arc segment is defined by three points We thus need eight points for the circle The circle has radius 0 3 and its centre is at 0 5 0 5 0 0 Click on Points

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/bfc1.htm (2016-02-15)
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  • WORKSHOP - BFC (2) Making Frames
    as I J and K There is no link between these and the Cartesian axes X Y Z used for geometry definition Surfaces are made up of frames A frame is a four sided element which may however be made up from more than four lines The pentangle at z 1 will be one frame Its corners will be points P1 P2 P3 and P5 The circle at z 0 will be another frame with corners P6 P8 P10 and P12 It is up to you to decide how to align the frame edges with the I J K grid directions The number of cells on each line can now be specified bearing in mind the requirement for a structured mesh Click on the Lines button then Modify lines Point to line A6 the bottom arc and click When the line is selected a sub menu is displayed that allows the number and distribution of cells along the line to be modified The selected line is shown in red and named in the top line of the table Enter the new number of cells 10 for line A6 When you click Ok the line is re defined and the dialog is erased The line alteration menu is active until another function is selected allowing the modification of many lines one after another At this stage in the mesh generation we have to choose cell distributions on each line to maintain a structured mesh when the frames are defined Therefore if we specified 10 cells on arc A6 we MUST specify 10 cells on arc A8 because these will become opposite sides of a frame These will become the I cells Similarly the specification of 5 cells on arc A7 will require the specification of 5 cells on arc A9 These will become the J cells By clicking on lines A7 A8 and A9 set the number of cells as follows Line name Number of cells A6 10 A7 5 A8 10 A9 5 Therefore on the z 0 plane we have specified a 10 by 5 mesh To maintain a structured mesh we have to also specify a 10 by 5 mesh on the z 1 plane This requires the selection of the lines to modify and furthermore the mesh must be specified in a suitable orientation For this case we will keep 10 cells in I in line L1 and take 5 cells in lines L3 and L4 across the top of the duct By clicking on lines L1 L2 L3 L4 and L5 set the number of cells as follows Line name Number of cells L1 10 L2 5 L3 5 L4 5 L5 5 The screen should now look like this We can now generate the surfaces Surfaces are composed of Frames Frames are generated by using the Surfaces New Frames option To generate a frame each point around the frame edge must be selected in turn The points must be joined by lines The direction of

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/bfc2.htm (2016-02-15)
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  • WORKSHOP - BFC (3) Frame Matching
    right handed We have created two frames each having 10 5 cells The 10 cells are to be in the I direction and the 5 in J There will be 5 cells in the K direction smoothly joining the two frames The pentangle will be at the outlet on plane K 16 Once the duct becomes circular at frame F2 on plane K 11 it is to rotate through 180 degrees centred on the X axis This section will contain a further 10 cells in K making 15 in all You must specify how many computational cells are present in each direction For this case it is 10 5 15 In general there will be many frames on each plane The number of cells is the sum of the cells on the frame edges in each direction Click on the Dimension button A dialog appears which allows the selection and setting for each direction in turn Set the number of cells in I NX to 10 in J NY to 5 and in K NZ to 15 Initially the cells are distributed evenly over a default cube The cube size is set via the DX DY and DZ buttons and by default all three are 1 0 When all actions in this sub menu are completed click the Ok button to return to the calling menu The default mesh is set It can be viewed by clicking Display Mesh display Outer mesh and turning the edge displays for East North and High to On Having seen the default mesh turn the edged display back to Off Click OK to close dialogs until the BFC Menu We now have to match the FIRST corner of each frame to I J and K locations We must also specify the grid directions along the first two edges Click on Surfaces then the match Grid button then click on the label of frame F1 The frame matching dialog will appear Match point P1 to I 1 J 1 and K 16 the last K plane The direction from P1 to P2 is along I and from P2 to P3 is along J so no change is needed The grid check button switches on a visual orthogonality checker which shades the cells from red ok to blue bad We are not going to use the grid checking option so click Ok to end and apply the values specified in this panel Once matched the mesh is shown on the frame and the Smoothing dialog is displayed Note the red line drawn from point P4 This is a Region boundary similar to the regions formed at object edges in the Cartesian system Region boundaries are formed on all frame edges and at intermediate edge points such as P4 We are not going to use the smoothing option for this frame so click Ok to end We now have to match frame F2 Select it with the mouse Match frame F2 to I 1 J 1 and

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/bfc3.htm (2016-02-15)
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  • WORKSHOP - BFC (4) Copy/Transfer
    on the desktop or click on Start programs PHOENICS PHOENICS In PHOENICS VR environment Start with Library case B113 click on File then on Load from libraries Type B113 into the Case Number box then click OK From the commander level To enter the PHOENICS VR environment click on the Run vre icon in the left column To enter VR Editor This is the default mode of operation Within VR Editor Activate the Grid Generator by clicking on the Grid mesh toggle on the hand set then clicking anywhere within the domain to bring up the BFC menu dialog The grid generator screen is shown below If you are continuing BFC Tutorial 3 you will join Tutorial 4 here We have created two frames each having 10 5 cells and have matched them to the K 16 and K 11 planes We now want to smoothly interpolate the mesh between K 11 and K 16 to create the intermediate planes Click the Volumes button The dialog for creating volumes has options for Extruding a surface Revolving a surface about an axis Joining two opposing surfaces Filling in a volume enclosed by six surfaces Modifying the list of commands To vary the mesh smoothly between frames 1 2 click on 2 Opp faces By default the transfer works on the I plane The other planes are available by toggling Toggle from I through J to K Enter 11 in the from plane box Frame F2 is matched to K 11 and F1 is matched to K 16 Click OK to apply this transfer Once the duct becomes circular at frame F2 it is to rotate through 180 degrees centred on the X axis This section will contain a further 10 cells in K Click on Revolve The Revolve dialog will appear

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/bfc4.htm (2016-02-15)
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  • WORKSHOP - BFC (5) Boundary Conditions
    in the Total number of iterations box Exit the Main menu by clicking Top Menu OK All the domain related settings have been made now set the flow boundary conditions Create the inlet at K 0 Click on Settings menu select New and New object to bring up the object dialog box Click on Size button to set the object size as ISize 10 JSize 5 KSize 0 Note that in BFC the object sizes are set as numbers of cells in each co ordinate direction Planar objects have zero thickness in one direction Click on General and set the Type to INLET Click on ATTRIBUTES and set the Z direction velocity to 1 0 Note that the velocities are specified in the Cartesian co ordinate system Click OK to close the Attributes dialog and OK to close the Object dialog The screen should look like this Create the outlet at K 16 Click on Settings and select New and New Object Click on Size and Place buttons to set the size and position as follows IPos 0 JPos 0 KPos 15 ISize 10 JSize 5 KSize 0 Note that in BFC the object positions are set as cell corners in each co ordinate direction The numbering starts at zero Click on General and set the Type to OUTLET Click on Attributes and switch External turbulence to User set We need to do this as the exit cuts a vortex leaving the External turbulence at the default In cell leads to excessive turbulence levels in the diffuser section Click OK twice to close the Object dialog Create four plates We now need four plates to provide friction conditions on the insides of the duct Create the first plate at J 5 the last cell corner in J Click on Settings and select New and New Object Set the size and position as IPos 0 JPos 5 KPos 0 ISize 10 JSize 0 KSize 15 Click on General and set the Type to PLATE Click OK to close the Object dialog Make the second plate at J 0 by duplication Click the Duplicate object or group button and OK Move the duplicated object to Jpos 0 Create the third plate at I 10 the last cell corner in I Click on Settings and select New and New Object Set the size and position as IPos 10 JPos 0 KPos 0 ISize 0 JSize 5 KSize 15 Click on General and set the Type to PLATE Click OK to close the Object dialog Make the last plate at I 0 by duplication Click the Duplicate object or group button and OK Move the dupliacted object to Ipos 0 The final geometry should look like this The plates are hiding the inside of the duct so we can hide them Right click on the Hide and show toggle and set the entry for PLATE to Hide all Click OK The plates will all be hidden from view but will still remain active in

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/bfc5.htm (2016-02-15)
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  • WORKSHOP - BFC (6) A Simple Case
    Dimension and set NX to 15 NY to 15 This tells the mesh generator how many cells in total it has to set Click OK Create a surface Step 1 Create the frames Click on Surfaces then New Frames Click on points A B H G and A again to close frame F1 Click on points B C D H and B to make frame F2 Click on points G H D E F and G to make frame F3 F3 has more than four points so you must indicate which are the corners When you click on G the second time it will turn blue Now click on D to indicate that it is the next corner then E The frame will now be made Step 2 Match the frames Click on Match Grid then on the label of frame F1 The frame matching dialog will be displayed In the match point A to boxes set I 1 J 1 K 1 The direction from A B is I and B H is J so no changes are required here Click OK to set the grid in frame F1 Click OK on the Smoothing dialog to close it Now click on the label of frame F2 Point B should be matched to I 6 number of cells in L1 1 J 1 and K 1 The edge directions are again correct so click OK to set the grid Click OK on the Smoothing dialog to close it Finally click on the label of frame F3 Point G should be matched to I 1 J 6 number of cells in L7 1 K 1 The edge directions are again correct so click OK to set the grid Click OK on the Smoothing dialog to close it At this point the display should look like this Click OK twice to get back to the main BFC Menu dialog Create the Volume So far the mesh has been created for the K 1 plane PHOENICS uses a finite volume mesh so both faces K 1 K 2 must be set Click Volumes then Extrude Toggle the extrude direction from I to J to K Change the copy distance DZ from 1 0 to 0 2 then click OK to close the dialog and perform the extrusion Click OK twice to get back to the main BFC Menu dialog Use the View control buttons to rotate the image and see both planes of the grid Exit the grid generator by clicking OK Activate solution of variables In the main menu click on Models Click on Equation formulation Elliptic staggered Select Elliptic GCV and click OK This selects the GCV Collocated solver which is very good at dealing with non orthogonal distorted grids Leave Solution of velocities and pressure to ON and use the default KECHEN turbulence model Set numerical controls Click on Numerics and enter 100 in the Total number of iterations box Exit the Main menu by clicking Top Menu OK All

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/bfc6.htm (2016-02-15)
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web-archive-uk.com, 2017-12-17