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  • TR326: Space and Time Grids
    on X region 3 and Y region 1 of the example shown previously for example brings up the dialog box shown below Image GRID Mesh SETTINGS manual Number of cells Sets the total number of cells in the X Y and Z directions If all regions are Set this value cannot be changed directly as there are no Free regions to accommodate the change Tolerance Sets the tolerance used for this direction Object edges closer together than this will not generate separate regions Number of regions This displays the current number of regions in each direction This can only be changed by modifying objects or modifying the tolerance Modify region This is the number of the region selected for modification In the diagram above an X Y plane is displayed and the cursor was clicked into the third region in X and the first region in Y To modify a different region enter its number here directly and click Apply or click OK then click on the new region Size This displays the size in meters or radians of the region selected for modification The size of a region can only be changed by modifying objects or modifying the tolerance Distribution This toggles between Power law and Geometrical progression It controls how the cells within the region are spaced Cell Power This toggles between Free and Set Free means that the number of cells can be automatically adjusted as the total number of cells is changed so as to keep the grid as uniform as possible Set means that the number of cells in this region and their distribution have been set by the user and cannot be automatically changed Cells in region This initially displays the number of cells allocated to this region by the automatic meshing algorithm The number of cells in this region can be changed by typing in a different value Cells will be taken from or distributed amongst other Free regions to keep the total number constant Power ratio This sets the expansion power or geometric expansion common ratio The default setting of 1 0 gives a uniform grid Positive values mean that the expansion goes from the start of the region towards the end negative values mean the expansion starts at the end and goes to the beginning Symmetric This toggles between No and Yes If Yes the expansion specified by Distribution and Power ratio is applied symmetrically from each end of the region Edit all regions This displays a dialog which shows all the region settings in a particular direction and allows them to be changed This is the easiest way to change the settings for several regions The diagram below shows a simple three part grid Region 1 has 10 cells with a power of 1 5 Region 2 has 10 cells with a symmetric power of 1 5 and region 3 has 10 cells with a power of 1 5 Image DIAGRAM 1 The next diagram shows the same grid but with geometrical expansions in all three regions Image DIAGRAM 2 Advice on Grid Settings The user is advised to use the power law or geometrical expansions to reduce the change in grid size between regions This will assist convergence of the Earth solver With the auto meshing turned on this is controlled by reducing the minimum cell size and adjusting the maximum size ratio Reducing both these values will act to reduce the rate of change of grid size across region boundaries but also increase the number of cells The tolerance can be adjusted to eliminate very thin regions where objects nearly line up Body Fitted Co ordinates All BFC library cases and all user generated BFC cases can be loaded into PHOENICS VR The possible methods of grid generation are The BFC Menu in the VR Editor External grid generator such as ICEM CFD from ANSYS FEMGV from TNO Diana These all lead to grid files read in with READCO PIL GSET Commands hand edited into Q1 Displaying the Grid Turning the mesh toggle on the hand set ON by clicking on the Grid mesh button causes the current grid to be displayed on the graphics image Image BFC Grid The grid is displayed on a plane at the probe location The plane is normal to the co ordinate axis nearest the view direction For example if the view direction is along or close to Z the X Y plane will be displayed As the probe is moved or view directions are changed the grid display will also change to follow In a multi block grid the grid will be displayed in the block containing the probe Moving the Probe In BFC the probe can only be moved from cell centre to cell centre The probe location is always in IX IY IZ In a multi block case these are shown in big grid co ordinates not in local block co ordinates Any cell can be moved to directly by typing the cell IX IY IZ values into the hand set Note the colouring of the block containing the probe The blue axis is the I axis The green axis is the J axis The yellow axis is the K axis In a complex multi block case this will help in identifying which way to move the probe To move the probe from one block to the next move up to a linked face and then step through it by continuing to move in that direction The axis colouring will jump to the next block If the Move probe button is kept pressed and the IJK orientation of the next block is different the probe may take off in an unexpected direction it may even jump back to the previous block if the axes are reversed Modifying the Grid Creating a Grid with the PHOENICS Grid Generator To enter the Grid Generator turn the grid display ON by clicking on the Grid mesh button Click on the grid anywhere

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_docs/tr326/vr-grids.htm (2016-02-15)
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  • FLAIR Tutorial 1: Investigating library case I203
    of the geometry e g the curved roof and stage The domain is filled with air and ideal gas law was used in calculating pressure temperature density relationships The roof floors and walls were modelled using a material with the following properties density 1700kg m 3 specific heat 800J kg degK thermal conductivity 0 62W m degK The effects of gravity were included by way of sources of momentum in the equations for the z component velocity using the built in buoyancy facilities available in PHOENICS The LVEL model of turbulence is used to close the Reynolds averaged Navier Stokes equations The air supply under the balcony on the long side of the theatre is introduced at 12degC The incoming air velocity from this long slot is fixed at 3m s giving a mass flow rate of about 2 5m 3 s Further air is supplied under the seating at the rear of the auditorium only at 18degC The inflow supply rate is 0 7m 3 s providing by seven 70mm high inlets The occupant and light gains were modelled using heat sources respectively equivalent to 145W m 2 and 50W m 2 The ten outlets at the top of the domain were modelled as 500mm long by 250mm wide fixed pressure openings You may close the window after viewing the description After successful loading the geometry of case I203 will appear on the screen as shown below This case was to simulate the air flow and thermal characteristics in the theartre influenced by the ventilation system Investigating the model settings Click on the Object management button You will see all the objects listed on the object management dialog box as shown below You may double click on each of those objects and investigate their attributes For example you double

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/flair/fla_tut1.htm (2016-02-15)
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  • FLAIR Tutorial 2: A room with two radiators
    object on the Object management dialog Click on the Duplicate object button followed by clicking OK to confirm duplicating Please note that the duplicated object is at the same place as that of the original object Double click on the newly duplicated object to bring up the Object specification dialog box Change the name to RADIAT2 Click on the Place button and set Position of the object as X 0 0 m Y 2 92 m Z 0 0 m Click OK to return to the Object Management dialog box f add a vent Click on the Object menu and select New New Object on the Object management dialog box to bring up the Object specification dialog box Change name to VENT Click on the Size button and set Size of the object as X 0 3 m Y 0 0 m Z 0 27 m Click on the Place button and set Position of the object as X 2 48 m Y 0 0 m Z 2 15 m Click on General button and set value of Type to be OPENING The user can click on Attributes to examine the default settings which are used Click on OK to close the Object specification dialog box g add the wall at x 3m The wall object with the PLATE type is used to set the wall friction and the surface temperature The window objects created above have the same effect Click on the Object menu and select New New Object on the Object management dialog box to bring up the Object specification dialog box Change name to WALL1 Click on the Size button and set Size of the object as X 0 m Y tick to end Z tick to end Click on the Place button and set Position of the object as X tick at end Y 0 0 m Z 0 0 m Click on General button and set value of Type to be PLATE Click on Attributes button and select Surface temperature for Energy source Set Value to 20 degree C Click on OK to close the Attributes panel and click on OK to close the Object specification dialog box h add the wall at y 5m Click on the Object menu and select New New Object on the Object management dialog box to bring up the Object specification dialog box Change name to WALL2 Click on the Size button and set Size of the object as X tick to end Y 0 0 m Z tick to end Click on the Place button and set Position of the object as X 0 0 m Y tick at end Z 0 0 m Click on General button and set value of Type to be PLATE Click on Attributes button and select Surface temperature for Energy source Set Value to 20 degree C Click on OK to close the Attributes panel and click on OK to close the Object specification dialog box i add the wall at y

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/flair/fla_tut2.htm (2016-02-15)
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  • FLAIR Tutorial 3: Comfort index in a room
    on OK to close the object specification dialog box Use the Rotate object up button to rotate the MAN object until the man faces the positive y direction To activate the physical models a The Main Menu panel Click on the main Menu button Click on the Title dialogue box Then type in Comfort indices in a room Click on Models to obtain the Model menu page FLAIR always solves pressure and velocities The temperature is also solved as the default setting The Models page of the Main Menu b To activate LVEL turbulence model Click on the Turbulence models button to bring up a list of available turbulence models Select the LVEL from it Click on OK c To activate IMMERSOL radiation model Click on Radiation models button The following dialog box will appear Select Immersol and the click OK to return to the Models panel as shown below d To activate Comfort indices Locate Comfort indices and then click on its Settings button Switch on Predicted Mean Vote PMV as shown below We use a Fixed radiant temperature of 25 C for this case Click on Previous panel followed by clicking on Top panel To set the grid numbers and to solver parameters Click on Geometry Set the number of cells in X direction to 20 cells in Y direction to 40 cells in Z direction to 22 cells with the following sub region s modifications Region Cell Number X Y Z 1 1 5 7 2 4 2 1 3 1 2 6 4 2 2 1 5 1 1 1 6 4 8 2 7 3 5 2 8 2 7 2 9 2 8 n a Note that there are only 8 regions in Z direction Click OK to apply the changes and to close the Grid mesh Settings You can click on the mesh toggle button on the main control panel to view the grid distribution on the screen as shown below Click on Initialisation then set the following initial values Variable W1 TEM1 FIINIT Value 0 01 20 The above initial settings are used to secure the convergence Click on Top menu to return to the top menu Click on Main menu on Numerics Set the Total number of iterations to 1000 Click on Limits on variables then set the following values Variables T3 TEM1 VARMIN 15 15 The above settings are used to secure the convergence Click on Previous panel Click on Top menu back to the top menu panel Next a point in the flow domain should be set where the flow variables can be probed or monitored as the solution runs The monitor point is shown as the red pencil probe It can be moved interactively with the X Y Z position up and down buttons as long as no object is currently selected For example set the x position 0 67 the y position 1 35m and the z position 0 44m It can also be set by clicking

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/flair/fla_tut3.htm (2016-02-15)
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  • FLAIR Tutorial 4: Fire in a room
    the WIND1 object in the Object management dialog box Click on Duplicate object button followed by clicking OK to confirm duplicating Double click on the newly duplicated object in the object list to bring up the Object specification dialog box Change name to WIND2 Click on the Place button and set Position of the object as X tick at end Y 4 0 m Z 1 0 m Click OK to return to the Object management dialog box g add the third window Highlight the WIND1 object in the Object management dialog box Click on Duplicate object button followed by clicking OK to confirm duplicating Double click on the newly duplicated object in the object list to bring up the Object specification dialog box Change name to WIND3 Click on the Size button and set Size of the object as X 1 5 m Y 0 0 m Z 0 8 m Click on the Place button and set Position of the object as X Un tick at end and set 1 0 m Y tick at end Z 1 0 m Click OK to return to the Object management dialog box h add the fourth window Highlight the WIND3 object on the Object management dialog box Click on Duplicate object button followed by clicking OK to confirm duplicating Double click on the newly duplicated object in the object list to bring up the Object specification dialog box Change name to WIND4 Click on the Place button and set Position of the object as X 4 0 m Y tick at end Z 1 0 m Click OK to return to the Object management dialog box i add the partition Click on the Object menu and select New New Object on the Object management dialog box to bring up the Object specification dialog box Change name to PART Click on the Size button and set Size of the object as X 0 0 m Y 3 0 m Z 1 8 m Click on the Place button and set Position of the object as X 7 0 m Y 3 0 m Z 0 0 m Click on General button and Define TYPE PLATE Click on OK to close the Object specification dialog box j add the floor Click on the Object menu and select New New Object on the Object management dialog box to bring up the Object specification dialog box Change name to FLOOR Click on the Size button and set Size of the object as X tick to end Y tick to end Z 0 0 m Click on the Place button and set Position of the object as X 0 0 m Y 0 0 m Z 0 0 m Click on General button and Define TYPE PLATE Click on Attributes then on Adiabatic next to Energy source Select Surface temperature and click OK Set the surface temperature value to 20 C Click on OK to close the Object specification dialog box k add the ceiling

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/flair/fla_tut4.htm (2016-02-15)
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  • FLAIR Tutorial 5: A room with sunlight
    default screen Click on Edit menu and choose Select object This brings up the list of shapes Scroll down and find the Sunlight object in the list as shown below The List of shapes A double click on the Sunlight object will bring up the Object parameters dialog box for the Sunlight The Room parameters should be defined first It is important that the room size should be the same as that in VR Editor otherwise the window shadows could be in the middle of the room as internal plates and the heat source on the shadows will be lost For this case set the room size Length X 3m Width Y 5m Height Z 2 7m Set the window size Width Y 1m Height Z 1m Set the window position Y coordinate 1m Z coordinate 1m Set the Angle between the ray direction and X axis in XZ plane 30 degrees Please note that the wall where the window is located is largely controlled by the Angle between the ray direction and X axis as follows It is obvious that the window can be only on the West wall if 0 degree in XY plane is specified and on the East wall if 180 degree in XY plane is specified The right bottom entry box in the sunlight parameters panel enables the user to specify the intensity of the thermal radiation through the window and the Shapemaker will calculate the heat source heat on the window shadows For this case Set the intensity of thermal radiation to 10 W m 2 The Sunlight Object parameters Click on Save as POB file button and in the Save POB as window click on save then click on Exit The resulting sunlight object will appear as shown below The Sunlight object Click on File menu and Exit The saved POB will be automatically imported Click on OK on the Position of Imported Assembly dialog box and the following picture will appear on the screen Click on OK to close the Object specification dialog box The type of the imported sunlight object appearing in the Object management dialog box is Assembly Click on Action menu and Hide Object s You may click on the projected shadows to check their attributes which should be as shown below Then click on object and close to close the Object Management box To activate the physical models a The Main Menu panel Click on the Main Menu button Click on the Title dialogue box Then type in A room with sunlight Click on Models to obtain the Model menu page FLAIR always solves pressure and velocities The temperature is also solved as the default setting The Models page of the Main Menu b To activate LVEL turbulence model Click on the Turbulence models button to bring up a list of available turbulence models Select the LVEL from it Select LVEL turbulence model Click on OK Click on Top menu To set the grid numbers and to solver

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/flair/fla_tut5.htm (2016-02-15)
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  • FLAIR Tutorial 6: A fan mounted at the boundary of a cabinet
    and set Size of the object as X 0 05 m Y 0 07 m Z 0 02 m Click on the Place button and set Position of the object as X 0 15 m Y 0 15 m Z 0 35 m Click on General button Click on Attributes button to bring up the attributes dialog Change Types to Solids Change the Material to 100 ALUMINIUM at 27 deg C Change the Energy source to Fixed Heat Flux and Total Heat Flux Change the Value to 0 5 W Click on OK to return to the Object specification dialog box Click on OK to close the Object specification dialog box d add the second chip by duplicating CHIP1 Highlight the CHIP1 object on the Object management dialog box Click on the Duplicate object or group button and then refresh the Object management dialog box Double click on the newly duplicated object to bring up the Object specification dialog box Change the name to CHIP2 Click on the Place button and set Position of the object as X 0 3 m Y 0 15 m Z 0 35 m Click on General button Click on Attributes and change the total heat flux value to 0 7 Click on OK to return to the attributes dialog Click on OK to close the Object specification dialog e add the PCB Click on the Object menu and select New New Object on the Object management dialog box to bring up the Object specification dialog box Change name to PCB Click on the Size button and set Size of the object as X 0 3 m Y 0 3 m Z 0 01 m Click on the Place button and set Position of the object as X 0 1 m Y 0 1 m Z 0 34 m Click on General and select PCB from the list of geometry type Click OK to return to Object Management Box Now we have 5 objects listed in the Object management dialog box as shown below To activate the physical models a The Main Menu panel Click on the Main Menu button The top page of the main menu will appear on the screen Click on the Title dialogue box Type in A cabinet with a fan To activate K E turbulence model Click on Models to obtain the Model menu page FLAIR always solves pressure and velocities The temperature is also solved as the default setting The Models page of the Main Menu Click on the Turbulence models button to bring up a list of available turbulence models Select the KEMODL from it Click on OK to activate Fan operating point option Change Fan operating point option from OFF to ON with default settings Click on Settings for Fan operating point then click Edit on the next dialog The fandata file will be opened in the default file editor Scroll down to FAN1 and check that the settings are as shown below FAN1 5 0 8

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/flair/fla_tut6.htm (2016-02-15)
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  • FLAIR Tutorial 7: A computer room
    on OK In the Object specification dialog box Change name to Diffuser Click on the Size button and set Size of the object as X 1 0 m Y 1 0 m Z 0 1 m Click on the Place button and set Position of the object as X 4 5 m Y 14 0 m Z 2 9 m Click on Attributes and then set the supply temperature to 20 degree C and Supply volume to 500 L s Click on OK to return to the Object specification dialog box Click OK again c add the array of desks and computers Click on the Object menu and select New New Object on the Object management dialog box to bring up the Object specification dialog box Change name to DESK Click on the Size button and set Size of the object as X 2 0 m Y 1 2 m Z 1 2 m Click on the Place button and set Position of the object as X 2 0 m Y 2 0 m Z 0 0 m Click on Shape and select the desk object from the directory d object public furnture for the geometry Click on OK to close the object specification dialog box Click on the Object menu and select New New Object on the Object management dialog box to bring up the Object specification dialog box Change name to MONITR Click on the Size button and set Size of the object as X 0 8 m Y 0 8 m Z 0 8 m Click on the Place button and set Position of the object as X 2 6 m Y 2 0 m Z 1 2 m Click on Shape and select the monitor object from the directory d object public furnture for the geometry Click on OK to close the object specification dialog box Highlight the DESK and MONITR objects on the Object management dialog box Click on Group menu and click on Save This will produce a GROUP object listed on the Object management dialog box Highlight all three objects GROUP DESK and MONITR Click on Object menu and select Array objects option This will bring up the Array settings dialog box on the screen Set dimension and pitch values as shown below Click on OK to complete the arraying objects operation To activate the physical models a The Main Menu panel Click on the main Menu button Click on the Title dialogue box Then type in Flow in a computer room Click on Models to obtain the Model menu page FLAIR always solves pressure and velocities The temperature is also solved as the default setting The Models page of the Main Menu b To activate K E turbulence model Click on the Turbulence models button to bring up a list of available turbulence models Select the KEMODL from it Click on OK Click on Top menu c To set the grid numbers and to solver parameters Click on Geometry Set the number

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/flair/fla_tut7.htm (2016-02-15)
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