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  • WORKSHOP - Lighter fluid penetrating heavier liquid
    Set Reference density 1000 Click Top menu and click OK Adjust the view point Click on Move right toggle to view in X direction Click Reset to line up Create the OIL IN object Click on Settings New and New Object Change name to OIL IN Click on Size and set SIZE of object as Xsize 1 0 Ysize 0 2 Zsize 0 0 Click on Place and set POSITION of object as Xpos 0 0 Ypos 0 4 Zpos 1 0 Click on General Define Type Inlet Click on Attributes Set velocity in Z direction to 2 0 m s Set Inlet density at Domain fluid Set C1 Inlet value 0 0 Click on OK to close the Attributes menu and on OK in the Object Specification Dialogue Box Create the FREE N object Click on Settings New and New Object Change name to FREE N Click on Size and set SIZE of object as Xsize 1 0 Ysize 0 0 Zsize 1 0 Click on General Define Type Outlet Click on Attributes and set C1 External value USER SET Set User set 1 0 Click on OK twice to exit the Object Dialogue Box Create the FREE S object Click on Settings New and New Object Change name to FREE S Click on Size and set SIZE of object as Xsize 1 0 Ysize 0 0 Zsize 1 0 Click on Place and set POSITION of object as Xpos 0 0 Ypos 1 0 Zpos 0 0 Click on General Define Type Outlet Click on Attributes and set C1 External value USER SET Set User set 1 0 Click on OK twice to exit the Object Dialogue Box Create the FREE LOW object Click on Settings New and New Object Change name to FREE LOW Click on Size

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/sem/wsprosem.htm (2016-02-15)
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  • WORKSHOP - Multi-phase: ASM
    Solution for velocities and pressure to ON Click on LAMINAR Turbulence models and choose the KEMODL Click on ONE PHASE next to The simulation is and select Algebraic slip Click Settings next to ALGEBRAIC SLIP and set Number of particles 2 then click Apply Carrier fluid properties Density 1000 Kinematic viscosity 1 E 6 Particle properties PT1 PT2 Density 1250 1250 Diameter 1 E 3 1 E 4 Viscosity 2 5E 6 2 5E 6 The user is advised to check Properties which should show the same settings as above Initialisation Click on Initialisation Set the initial value for PT0 to 1 0 and to 0 01 for PT1 and PT2 PT0 is the carrier fluid and the domain is initially full of the carrier fluid with no particles Click on next to Variable to scroll the list of variables until PT0 is visible Set gravitational force Click on Sources Switch Gravitational forces to ON The buoyancy model is DENSITY DIFFERENCE and gravitational acceleration is in Y direction Enter numerical settings Click on Numerics Set Total of number of iterations to 250 Set Global convergence criterion to 0 0001 otherwise the pressure correction and particle solutions may cut out too soon in this case Click Relaxation control and set the following values U1 V1 KE EP PT0 PT1 0 2 0 2 0 5 0 3 0 8 0 8 Click Previous panel Click on Top menu and then on OK to exit from Menu To get the right view point click on Reset then View Z Up Y then Fit to window Create Objects and specify boundary conditions Create the inlet Click on Obj Button on the VR Editor control panel Change name to IN Set Position and Size of the object as Xpos 0 0 Xsize 0 0 Ypos 1 1 Ysize 1 0 Zpos 0 0 Zsize 1 0 Define Type Inlet Click on Attributes Set the Volume fraction of PT1 to 0 01 Set the Volume fraction of PT2 to 0 01 Set the X direction velocity to 3 m s Click OK to exit from the Object Dialogue Box Create the outlets Click on Obj Button on the VR Editor control panel Change name to OUTU Set Position and Size of the object as Xpos 8 0 Xsize 0 0 Ypos 1 7 Ysize 0 5 Zpos 0 0 Zsize 1 0 Define Type Outlet Click OK to exit from the Object Dialogue Box Click on Obj Button on the VR Editor control panel Change name to OUTL Set Position and Size of the object as Xpos 8 0 Xsize 0 0 Ypos 0 0 Ysize 0 5 Zpos 0 0 Zsize 1 0 Define Type Outlet Click OK to exit from the Object Dialogue Box Create the blockages Create the following Blockage type objects Name Xpos Ypos Zpos Xsize Ysize Zsize PLT 2 0 1 5 0 0 6 0 0 2 1 0 SLTU 4 0 2 6 0 0 0 2 0

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/asm/wsasm1.htm (2016-02-15)
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  • WORKSHOP - Local depth in an open U-bend
    the left column fs In PHOENICS VR environment Start with an empty case click on File then on Start New Case then on Core then click on OK to confirm the resetting To enter VR Editor This is the default mode of operation Within VR Editor Load Library case B527 and run the base rigid wall case Click on File then Load from Libraries Enter B527 in the case number data entry box and click OK Click on Satellite command prompt and press return until the geometry appears on the screen Within VR Editor Activate solution of isentropic analog of shallow water equations Click on Menu Click on Properties Click on Density CONSTANT and from the list of options select Isentropic Click OK Set RHOA 2 9 81 0 5 0 4515 and RHOB 0 5 Change Storage ON Set Reference pressure 9 81 h in 2 2 4 905 where h in 1 m inlet depth Click Top Menu and OK Set the inlet conditions Click on the Object management button on the main control panel Click twice on the inlet object called IN to bring up the object specification dialog box Click on Attributes Change at a pressure

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/shallwat/wshalwat.htm (2016-02-15)
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  • WORKSHOP - A whirlpool in a shallow pond
    models and select CONSTANT Click on Settings and set Turbulent viscosity 2 e 4 Click Previous panel to get back Activate anisotropic analog of shallow water equations Click on Properties Set Use property tables OFF Click on Density CONSTANT from the list of options select Isentropic and click OK Set RHOA 2 1000 9 81 1 2 14 278 and RHOB 0 5 Change Storage ON Change Viscosity 1 e 6 Click on Page Dn and Set Reference pressure 1000 9 81 0 5 2 2 1226 Click on Page Up and then click Top menu and click OK Click on Reset button and Fit to window Create the BEAM object Use the view toggles to adjust the view point as appropriate Click on Settings New and New Object to bring up the Object specification dialog box Change name to BEAM Click on Size and set SIZE of object as Xsize 1 0 Ysize 5 0 Zsize 0 83 Click on Place and set POSITION of object as Xpos 0 0 Ypos 0 0 Zpos 4 17 Click on General Select Type Blockage default and on OK to close the Object Specification Dialogue Box Create the WATER IN object Click on Settings New and New Object to bring up the Object specification dialog box Change name to WATER IN Click on Size and set SIZE of object as Xsize 1 0 Ysize 2 86 Zsize 0 0 Click on General Define Type Inlet Click on Attributes and set velocity in Z direction at 1 0 m s Click on OK to close the Attributes menu and on OK in the Object Specification Dialogue Box Create the OUTLET object Click on Settings New and New Object to bring up the Object specification dialog box Change name to OUTLET Click on Size

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/shallwat/wshalpln.htm (2016-02-15)
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  • WORKSHOP - GENTRA
    Menu Setting the Input Output Controls From the GENTRA Main Menu click on I O Controls The following Menu panel will appear on the VDU Output of histories and trajectories Click Output of histories and trajectories to display the following Menu panel Since we require individual history and trajectory files click on Output for Individual particle and then the following menu panel appears Enter H as the first character for the name of the individual history file Enter T as the first character for the name of the individual trajectory file Enter 1 as the first track for which an individual history trajectory file is required Enter 5 as the last track for which an individual history trajectory file is required Click on Previous panel twice to return to the I O controls Menu Click Previous panel twice more to return to the Main Menu Click Top Menu and OK to leave the Main menu and return to the VR Editor 3 Defining the Inlet Conditions for the Particles The task is now to specify the particle inlet conditions in the Q1 file For more detailed information than is given here the user is referred to the instructions given in Section 2 7 1 of the GENTRA User Guide TR211 Click on File then on Open file for editing and then on Q1 Click on Yes when prompted to save files Now insert the lines of inlet data between the two special marks provided by the GENTRA Menu Session i e GENTRA INLET DATA and END GENTRA INLET Please note that the inlet data lines must not start in the 1st or 2nd column of the Q1 file and the length of the data should not exceed column 68 in the Q1 file The final result is shown in the following extract from the Q1 file GENTRA GROUP 2 Boundary conditions for particles Inlet data file name GINFIL Q1 GENTRA INLET DATA X Y U V DIA RHO MASSFLO 0 0E 00 9 0E 02 11 25 6 5 1 E 05 1500 2 00E 03 0 0E 00 7 0E 02 11 25 6 5 1 E 05 1500 2 00E 03 0 0E 00 5 0E 02 5 63 0 4 1 E 05 1500 2 00E 03 2 0E 01 0 5E 02 1 80 0 6 1 E 05 1500 2 00E 03 2 0E 01 1 0E 02 8 54 0 3 1 E 05 1500 2 00E 03 END GENTRA INLET It may be convenient to use Copy and Paste to insert the above settings In addition increase LSWEEP from 150 to 200 in Group 15 in the Q1 file as more sweeps will be needed for convergence of the GENTRA run Now save the modified Q1 by clicking on File Exit and Yes Allow VR to re load themodified Q1 4 Running the GENTRA CFD Solver Run EARTH by clicking on Run Solver Earth and OK 5 The GENTRA Output Files In addition

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/gentra/wsgentra.htm (2016-02-15)
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  • WORKSHOP - PLANT
    Click on General Define Type as Plate Click on OK to exit from the Object Dialogue Box Create the left adiabatic wall by duplicating RIGHT Click on the Duplicate object or group button and then click on OK to confirm duplicating Double click on the image of the copy to bring up the Object specification dialog box Change name to LEFT Click on Place and change Xpos to 0 0 Click on OK to exit from the Object Dialogue Box Create a fixed pressure point in the middle Click on Settings New and New Object Change name to FIXEDP Click on Size and set Size of the object as Xsize 0 005 Ysize 0 1 Zsize 0 005 Click on Place and set Position of the object as Xpos 0 05 Ypos 0 0 Zpos 0 05 Click on General Define Type as Pressure Relief Click on OK to exit from the Object Dialogue Box Set the grid Click on the Mesh toggle button The default mesh shown as orange lines will appear on the screen Click anywhere on the image and the Grid mesh settings dialog box will appear Change the Number of cells to 15 in X and 15 in Z Set Power ratio for both X and Z to 2 0 and Symmetric to Yes Click on OK to close the dialog box The mesh will now be shown as blue lines Click on Mesh toggle again to turn off the mesh display Make the PLANT settings Click on Run Pre processor then Fortran creator Plant menu Click on Properties of the medium then click Add On the next panel scroll the list of available properties down until laminar kinematic viscosity appears Then click on it to select it In the PLANT statements box enter the formula VISL 1 E 3 EXP 1 6 TEM1 Click OK to set the expression then Exit to quit the PLANT menu Make the solution control settings Click on Main menu then on Numerics Leave the total number of iterations to 100 Click on Relaxation Switch Automatic convergence control OFF Set the Self Adjusting Relaxation algoritHm SARAH parameter to 0 005 Set the relaxation value for TEM1 to 1000 Click on Previous panel Top menu and OK to exit the Main menu Running the Solver In the PHOENICS VR environment click on Options then Run version For Earth select Private Click on Run Solver Earth Click on OK to confirm running the Solver Click on Yes to allow the compilation and re linking to proceed Using the VR Viewer In the PHOENICS VR environment click on Run Post processor then GUI Post processor VR Viewer Viewer and view the velocity vectors contours and isosurfaces Click on C to select the viscosity variable ENUL Hint change the slice direction to Y Workshop 2 linear inlet profile This workshop shows the user how to set a linear inlet velocity profile using PLANT It is based in library case 240 The library case is

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/wsplant.htm (2016-02-15)
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  • WORKSHOP - Modifying GROUND
    See the FUNCTion library entry in POLIS for a complete list of FN subroutines and 2 Direct access to the F array using the L0F function to obtain starting locations The entry to GROUND for density will be activated in Q1 by setting RHO1 GRND In VR this means selecting USER for the density formula Compiling and Linking The new GROUND has to be compiled before a new EARTH can be built Compilation is performed via the COMPILE Ground menu of VR Environment and building through BUILD Earth If a private Earth is selected to be run see below and the GROUND file is newer than the Earth executable the option of recomiling and relinking will be offered Testing the Coding The coding will be tested by comparing the results generated by the GREX option and the new coding Library case B529 which is concerned with supersonic flow around a rocket happens to use the Ideal Gas Law and hence can be used for testing The following steps should be followed VR must be turned off to enable the multi run to work Click on Run then Commander From this environment any of the PHOENICS modules can be run Click on Run Pre processor Text mode Satellite T and load library case B529 This can be done from command mode F2 by typing LOAD B529 or from the Top Menu by going to Library F4 selecting 2 Load specified case and entering B529 End F7 saving the input file Edit the Q1 click on File Open file for Editing select Q1 Modify the first line to read RUN 1 3 instead of RUN 1 1 This indicates that three EARTH runs will be made in one submission This is called a multi run See the Encyclopaedia entry on RUN for more information Change LSWEEP from 100 to 2 in order to reduce run time We are not interested in converged solutions just identical solutions Before the STOP at the bottom of the file insert NOWIPE T This will prevent the input data being reset to default values for subsequent runs Each run then becomes a parameter variation on the first By default EARTH writes out the flow field into a file called PHI or PHIDA In this case each run would overwrite the PHI file from the previous run This can be avoided by changing the name of PHI for each run This is done by setting NSAVE RUN1 say for the first run This case happens to set USEGRD F Delete this line otherwise the new GROUND coding will never be executed The settings before the STOP define the default case against which we will test the new coding After the STOP insert RHO1 GRND which will switch off the built in coding and activate the new coding Set RG 1 to the required gas constant Set IG 1 1 to elect the first method of calculation and set NSAVE RUN2 say to prevent the PHI file being overwritten

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/wsground.htm (2016-02-15)
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  • WORKSHOP - In-Form: Inlet Boundary Layer Profile
    all regions in Z direction Set the power for region 1 to 1 4 This will make the Z grid finer near the ground Click OK Click on OK to close the Grid mesh settings dialog Models settings Click on Models Turn Solution for velocities and pressure to ON Click on LAMINAR Turbulence models and choose the KE Variants From the next dialog choose KEMMK This model is suitable for atmospheric boundary layers Enter numerical settings Click on Numerics Set Total of number of iterations to 400 Click Previous panel Click on Top menu and then on OK to exit from Menu Create Objects and specify boundary conditions Click on the Object Management button O on the toolbar or on the hand set This will display a currently empty apart from the domain list of objects Create the inlet In the Object management dialog click on Object New and New Object Change name to IN Set Position and Size of the object as Xpos 0 0 Xsize 0 0 Ypos 0 0 Ysize 1 0 Zpos 0 0 Zsize 20 0 Define Type User Defined Click on Attributes then on Edit InForm 13 The In Form editor will appear Between the lines SAVE13BEGIN and SAVE13END which appear in the input window type in the following commands SAVE13BEGIN DEFINE CONSTANT PARAMETER REAL GA GD GE GA 5 0 GD 0 05 GE 20 0 DEFINE VIN MDOT CHAR VIN MDOT VIN GA ZG 1 0 7 0 MDOT RHO1 VIN DEFINE SOURCE OF VARIABLES SOURCE OF P1 AT IN IS MDOT WITH AREA SOURCE OF U1 AT IN IS MDOT VIN WITH AREA SOURCE OF KE AT IN IS MDOT GD VIN 2 0 WITH AREA SOURCE OF EP AT IN IS MDOT 0 1643 KE 1 5 GD GE WITH AREA SAVE13END Click on File then Save current block Close the In Form Editor The line VIN GA ZG 1 0 7 0 sets the velocity profile to be V in a Z 1 7 where a is 5 0 GA above and Z is the height The next line multiplies the velocity by the density to get a mass flux The following lines set the mass momentum and K e sources for the object IN The with area qualifier states that the source is per unit area Note that the easiest way to insert these lines is to highlight them in the browser window right click and copy then paste into the In Form Editor window Click OK to exit from the Object Dialogue Box Create the outlets In the Object management dialog click on Object New and New Object Change name to OUT Set Position and Size of the object as Xpos 100 0 Xsize 0 0 Ypos 0 0 Ysize 1 0 Zpos 0 0 Zsize 20 0 Define Type Outlet Click OK to exit from the Object Dialogue Box In the Object management dialog click on Object New and New Object Change name to SKY Set

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/inform/wsinf1.htm (2016-02-15)
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