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  • WORKSHOP - Combustion: CHEMKIN
    initial value of W1 to 50 O2 to 0 24 and N2 to 0 76 Source settings Click on Sources Toggle Use Earth Generated wall functions EGWF to F Click on Page Dn and then click Advanced Settings PIL Type CHEMK1 in the New box then click Apply Change the Type from CELL to VOLUME Set the Coefficients and Values as follows Variable CH4 O2 H20 CO2 TEM1 Coefficient GRND9 GRND9 GRND9 GRND9 GRND9 Value GRND9 GRND9 GRND9 GRND9 GRND9 Click Previous panel Enter numerical settings Click on Numerics Set Total number of iterations to 1000 Click Relaxation control Leave the Automatic Convergence Control ON but reset the maximum increment MAXINC for temperature TEM1 to 10 0 This will limit the iteration to iteration change in temperature to 10deg allowing the flow to build up whilst the temperature rises Click Previous panel then Limits on Variables and set the following values CH4 O2 CO2 H2O N2 TEM1 VARMIN 0 0 0 0 0 0 0 0 0 0 273 VARMAX 1 0 1 0 1 0 1 0 1 0 3000 Click Previous panel Set Monitoring Options Click Output and Settings next to Field Printout Set OUTPUT 5 SPOT and OUTPUT 6 TABL to Y for CH4 N2 and DEN1 This will make the values of these variables at the probe location appear in the solver convergence monitor graph Click Previous panel Top Menu then OK to close the Main Menu Create Objects and specify boundary conditions Create a divider Click on Settings New and New Object Change the name to DIVIDER Click on Size and set Size of the object as Xsize 0 1 Ysize 0 4 Zsize 1 0 Click on Place and set POSITION of the object as Xpos 0 0 Ypos 1 0 Zpos 0 0 Click on General Define Type BLOCKAGE Click OK Create the Oxidant Inlet Click on Settings New and New Object Change name to OXIN Click on Size and set Size of the object as Xsize 0 1 Ysize 0 4 Zsize 0 0 Click on Place and set POSITION of the object as Xpos 0 0 Ypos 1 0 Zpos 1 0 Click on General Define Type USER DEFINED Click on Attributes and make the following settings In the New entry box type NOCPCK1 then click Apply A new PATCH command will be created Change the TYPE from CELL to LOW Make the following settings for Coefficient and Value P1 W1 O2 TEM1 Coefficient FIXFLU 0 0 0 0 0 0 Value GRND9 300 0 0 24 GRND9 This sets the inlet velocity to 300 cm s and the inlet mass fraction of Oxygen to 0 24 In the PIL command entry box at the top of the dialog type SPEDAT SET NOCPCK1 TINLET R 350 This sets the inlet temperature to 350 C Click Apply then close the Attributes and Object specification dialogs Create the first fuel Inlet Click on Settings New and New Object Change name to FUIN1 Click

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/combust/wschemkn.htm (2016-02-15)
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  • WORKSHOP - Turbulence Modeling
    click on the Iso Surface toggle To select the plotting variable To select Pressure click on the Select Pressure button To select Velocity click on the Select Velocity button To select Temperature click on the Select Temperature button To select any other variable click on the Select a Variable button Select DEN1 for density or ENUL for laminar viscosity values To change the direction of the plotting plane set the slice direction to X Y or Z To change the position of the plotting plane move the probe using the probe position buttons The following picture shows the velocity vectors The following picture shows the contours of turbulent viscosity In particular look at the length of the recirculation zone and the contours of turbulent viscosity ENUT Saving the results In the PHOENICS VR environment click on Save as a case make a new folder called TURBUL select the new folder and save as KE RNG K e Model The RNG model is a variant of K e based on ReNormalisation Group theory It uses different constants and has an addition term in the e equation The effect of the changes is to reduce the turbulent viscosity in regions of high shear e g in recirculation zones Hence it should predict a longer recirculation zone in agreement with experimental evidence Within VR Editor Click on Run Pre processor GUI Pre processor VR Editor to return to the Editor Change the turbulence model to RNG Click on Main menu Models Click on KEMODL next to Turbulence models From the list of models select KE variants and click OK Slect KERNG and click OK Click on Top menu OK Running the Solver In the PHOENICS VR environment click on Run Solver and click on OK to confirm running Earth Using the VR Viewer In the PHOENICS VR environment click on Run then VR Viewer and view the velocity vectors contours and isosurfaces Saving the results In the PHOENICS VR environment click on Save as a case select the folder TURBUL and save as RNG CHEN KIM K e Model The CHEN KIM model is a variant of K e based on comparison with experimental data It uses different constants and has an addition term in the e equation The effect of the changes is to reduce the turbulent viscosity in regions of high shear e g in recirculation zones Hence it should predict a longer recirculation zone in agreement with experimental evidence Within VR Editor Click on Run Pre processor GUI Pre processor VR Editor to return to the Editor Change the turbulence model to CHEN KIM Click on Main menu Models Click on KERNG next to Turbulence models From the list of models select KE variants and click OK Click KECHEN and click OK Click on Top menu OK Running the Solver In the PHOENICS VR environment click on Run Solver and click on OK to confirm running Earth Using the VR Viewer In the PHOENICS VR environment click on Run Post

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/wsturmod.htm (2016-02-15)
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  • WORKSHOP - LVEL Turbulence Model
    the geometry appears on the screen You may now close the command prompt Reset the material of the blockages The three blockages are made of material 199 this allows fluid slip It provides no boundary conditions for the wall distance calculations Click on each blockage in turn to bring up its Object specification dialog box Click on Attributes and change the material to 198 Solid with smooth wall friction Activate the LVEL model Click on Main Menu then on Models Click on Turbulence models button From the list of turbulence models select LVEL Use Automatic convergence technique Click on Numerics and then Relaxation control Toggle Automatic convergence control from Off to ON Click on Reset solution defaults Click Previous panel Top menu and OK to quit the main menu Running the Solver In the PHOENICS VR environment click on Run Solver 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 OK on the file names dialog to accept the default files To view Vectors click on the Vector toggle Contours click on the Contour toggle Streamlines click on the

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/wslvel.htm (2016-02-15)
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  • WORKSHOP - Two Phase Flow
    the case number data entry box and click OK Click on SATELLITE command prompt and press return for all the default settings until the geometry appears on the screen You may now close the command prompt Activate solution of the second phase Click on Main menu Click on Models Click on One phase and from the list of multi phase models select IPSA Full Click OK Set interphase linkages Click on Settings next to IPSA FULL Click on Interphase Drag law User and from the list of Drag laws select Standard drag curve Click OK Set the particle diameter to 1 0E 4 m and the minimum slip velocity to 1 0E 3 m s Click Previous Panel Set properties of the second phase Click on Properties Click on Set Phase 2 properties Set the density of phase 2 to 100 kg m 3 Set initial values Click on Initialisation Set initial value of U2 to 13 same as U1 Set initial value of R1 phase 1 volume fraction to 0 9 and that of R2 phase 2 volume fraction to 0 1 You will have to use the buttons next to Variable to scroll the list of variables Set relaxation parameters Click on Numerics Click on Relaxation control and set Automatic convergence control to ON and click on Reset solution defaulds Click Previous panel Click on Output and toggle Monitor display from ASCII to GRAPHICS Set the Monitor update frequency to 1 Click Top menu and OK Set the inlet values for the two phases Click twice on the inlet object called INLET Click on Attributes Set the inlet density to 0 9 This is actually the phase 1 density 1 0 multiplied by the phase 1 volume fraction 0 9 Click on Setting values for Phase 1 to

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/ipsa/ws2phs.htm (2016-02-15)
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  • WORKSHOP - Introducing non-standard interphase transport
    storage for auxiliary variables Click on Settings next to Solution control Extra variables Set Activate Storage STORE CD for drag coefficient and click Apply Repeat for KOND NUSS REYN and VREL to activate the storage for gas thermal conductivity Nusselt number Reynolds number and relative phase velocity Click on Previous panel Set properties of the first phase Click on Properties Set Storage for density to ON Set ENUL 1 e 5 for the gas kinematic viscosity and Storage ON Click on Page Dn Click Advanced settings PIL Set C P1 5000 Set PRNDTL for Variable s R1 1 e10 to cut off phase diffusion You might need to click Page Dn again Set PRNDTL for H1 2 e 6 which is k C P1 and Click on Page Up and Click on Previous Panel Set the Kelvin to Celsius and enthalpy to temperature parameters for the first phase Click on Temperature NOT SET From the list of options select Linear in H and click OK Set T H o 273 click Storage to set it ON Click on Page Dn Set Reference temp 273 Click on Page Up Set properties of the second phase Click on Set Phase 2 Properties Set RHO 110 and click on Page Dn Set C P2 4000 Click on Page Dn or Line Dn as appropriate Click Advanced settings PIL Set PRNDTL for Variable s R2 1 e10 to cut off phase diffusion Set PRNDTL for H2 1 e10 to cancel the 2nd phase diffusion Click on Page Up Click on Previous Panel Set the Kelvin to Celsius and enthalpy to temperature parameters for the second phase Click on Temperature NOT SET from the list of select Linear in H and click OK Set T H o 273 Click Storage to set it ON Set interface properties Click on Set interface properties Set PHINT for Variable s H1 1 25 which is C P1 C P2 Set initial values Click on Initialisation Set initial value of W1 and W2 to 20 Set initial value of R1 phase 1 volume fraction to 0 999 and that of R2 phase 2 volume fraction to 0 001 You will have to use the buttons next to Variable to scroll the list of variables Set initial values of H1 to 1 365E 06 and initial value of H2 to 1 0E 06 These are the inlet enthalpies Set value of KOND to 0 01 Click on Apply Set relaxation parameters Click on Numerics Set Total number of iterations to 400 Set the Global convergence criterion to 0 1 Click on Relaxation control and set the DTFALS values for W1 W2 V1 V2 to 0 1 and H1 and H2 to 1000 Click Previous panel Top Menu OK Set the inlet values for the two phases Click twice on the inlet object called IN Click on Attributes Click on Phase fluid Set the inlet density to 0 999 This is actually the phase 1 density 1 0 multiplied by the

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/ipsa/ws2pnost.htm (2016-02-15)
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  • WORKSHOP - Two phase -- IPSA
    Z direction of the coordinate upright and Y direction pointing to the right as in the picture above Activate solution of the required variables and models Click on Menu and the on Models Change the simulation from One phase to IPSA FULL Leave Solution for velocities and pressure to ON Click on ENERGY EQUATION and then choose ENTHALPY and toggle STATIC to TOTAL Click on settings for IPSA FULL Set the interphase coefficient CFIPS to 2500 Set the interphase mass transfer coefficient CMDOT to HEATBL and turn Store to ON Set the interphase heat transfer coefficient CINT to 10 for both H1 and H2 Click on Previous panel Specify properties Clikc on Properties Turn Use property table to OFF Set the density of phase 1 to 749 94 kg m 3 Set the density of phase 2 to 35 55 kg m 3 Set interphase properties PHINT to 0 1 for H1 1 513E6 for H2 Set Initial values Click on Initialisation Set the following initial values 2 0 m s for W1 2 0 m s for W2 0 999 for R1 1 E 4 for R2 1 513E6 J kg for H2 Set gravitational force Click on Sources Turn Gravitational forces to ON Change Buoyance model to CONSTANT Set gravitational acceleration to 9 81 m s 2 in Z direction Enter numerical settings Click on Numerics Set Total number of iterations to 250 Click Relaxation control and set Automatic convergence control to OFF set the following values 0 1 for V1 False time step 0 1 for W1 False time step 0 1 for V2 False time step 0 1 for W2 False time step 0 25 for R1 Linear relaxation 0 25 for R2 Linear relaxation 1 0 for H1 False time step 1 0 for H2 False time step 0 1 for CMDO Linear relaxation Click Previous panel Click on Limits on variables and set VARMIN for H1 to 1 e 10 Click on Previous panel Click on Top menu and then on OK to exit from Menu Create Objects and specify boundary conditions Create the Inlet Click on Settings New and New Object Change name to INLET Click on Size and set Size of the object as Xsize 0 1 Ysize 0 0587 Zsize 0 0 Click on General Define Type INLET Click on Attributes Change the Inlet density to Dens Vol Frac Density Volume fraction Set enthalpy to 60000 J Kg Set velocity in Z direction at 2 m s Click on OK twice to exit from the Objectspecification Dialogue Box Create the heat source Click on Settings New and New Object Change name to Heater Click on Size and set Size of the object as Xsize 0 10 Ysize 0 Zsize 0 225 Click on Place and set Position of the object as Xpos 0 0 Ypos 0 0587 Zpos 0 15 Click on General Define Type PLATE Click on Attributes Change Energy source to Surface enthalpy and set the value to 1

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/ipsa/ws2boil.htm (2016-02-15)
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  • WORKSHOP - Free Surface Models: SEM
    variables and models Click on Menu and the on Models Leave Solution for velocities and pressure to ON Click on Turbulence models and select Laminar OK Click on Free Surface models and then choose SCALAR EQUATION Leave settings for cut off values for interface sharpening as default 0 4 and 0 6 Specify properties Click on Properties Leave the default settings for the light fluid and the heavy fluid they are 0 Air at 20 C deg 1 atm and 67 Water at 20 deg C respectively Click on Property Storage and set ON for Density and Viscosity then on Previous panel Keep the default setting for Domain initially full of Light fluid Sources settings Click on Sources Set Gravitational forces ON and click OK Set Buoyancy model to CONSTANT Change Gravitational acceleration to 0 0 in X and Y directions and 9 81 in Z Numerical settings Click on Numerics Set Total number of iterations to 10 Click Relaxation control and set Automatic convergence control to OFF Set the following values 0 01 for V1 0 01 for W1 Click Previous panel Output settings Click Field dump settings button and set First step to 1 Last step to 1000 and Step frequency to 40 and select a letter say N for PHI Click Previous panel and then on Top menu and OK to exit from Menu Create Objects and specify boundary conditions Create a Blockage for the step Click on Settings New and New Object on the top bar menu Change name to BLK Click on Size and set Size of the object as Xsize 1 0 Ysize 0 4 Zsize 0 13 Click on General Define Type Blockage Click OK to exit from the Object Dialogue Box Create the Inlet Click on Settings New and New Object on the top bar menu Change name to INLET Click on Size and set Size of the object as Xsize 1 0 Ysize 0 Zsize 0 0912 Click on Place and set Position of the object as Xpos 0 Ypos 0 Zpos 0 13 Click on General Define Type INLET Click on Attributes Set Inlet density to Heavy Set velocity in Y direction at 1 5 m s Click on OK twice to exit from the Object specification Dialogue Box Create the outlet Click on Settings New and New Object on the top bar menu Change name to OUT Click on Size and set Size of the object as Xsize 1 0 Ysize 0 Zsize 0 3 Click on Place and set Position of the object as Xpos 0 Ypos 1 0 Zpos 0 0 Click on General Define Type OUTLET Click on OK to exit from the Object specification Dialogue Box Adjust grid distribution in Z direction Click on Mesh toggle button and the grid will appear on the screen Make sure that the grid distribution is uniform in all regions Running the Solver In the PHOENICS VR environment click on Run Solver Earth and click on OK to confirm

    Original URL path: http://www.cham.co.uk/phoenics/d_polis/d_wkshp/sem/wssem2d.htm (2016-02-15)
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  • WORKSHOP - Water pouring into a bund by SEM
    OK to close the Grid mesh settings dialog Click on Models Leave the Solution for velocities and pressure ON Set the Free surface model to Scalar Equation Click on Top menu to return to the top menu Click on OK to exit the Main Menu Create the BEAM object Click on Settings New and New Object on the top bar menu Change name to BEAM Click on Size and set SIZE of object as Xsize 1 0 Ysize 0 1 Zsize 0 06 Click on Place and set POSITION of object as Xpos 0 0 Ypos 0 5 Zpos 0 0 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 on the top bar menu Change name to WATER IN Click on Size and set SIZE of object as Xsize 0 5 Ysize 0 0 Zsize 0 09 Click on General Define Type Inlet Click on Attributes and set velocity in Y direction at 5 0 m s Set Inlet density at Heavy for the inflowing water Click on OK to close the Attributes menu and on OK in the Object Dialogue Box Create the OUTLET object Click on Settings New and New Object on the top bar menu Change name to OUTLET Click on Size and set SIZE of object as Xsize 0 6 Ysize 0 0 Zsize 0 09 Click on Place and set POSITION of object as Xpos 0 2 Ypos 1 0 Zpos 0 0 Click on General Define Type Outlet Leave the default values in the Attributes dialogue box Click on OK to exit the Object Dialogue Box Create the FREE TOP object Click on Settings New and New Object on the top bar menu Change name to FREE TOP Click on Size and set SIZE of object as Xsize 1 0 Ysize 1 0 Zsize 0 0 Click on Place and set POSITION of object as Xpos 0 0 Ypos 0 0 Zpos 0 3 Click on General Define Type Outlet Leave the default values in the Attributes dialogue box Click on OK to exit the Object Specification Dialogue Box Set the initial values and fluids distributions Click on Menu and then on Initialisation Set zero values for P1 U1 V1 W1 and SURN in the fields provided for FIINIT values clicking to go through the list of variables Set the properties of heavy and light fluids Click on Properties To confirm that the light fluid material isn AIR at 20 deg C and the heavy fluid material is Water at 20 deg C Click on Propert Storage and set ON for Density and Viscosity then on Previous panel to get back Set gravity Click on Sources Set Gravitational forces ON and OK Set Buoyancy model to CONSTANT Change Gravitational acceleration to 0 0 in X and Y directions and 9 81 in Z Set the remaining solution output control parameters Click on Numerics

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