FLUENT V6 - Procedure for setting up a laminar flamlet combustion calculation (steady & unsteady) using the CHEMKIN database
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Procedure to create a steady and unsteady laminar flamlet combustion case using materials and reactions from CHEMKIN database in FLUENT 6.3.17 STEADY LAMINAR FLAMELET: 1. Copy the thermo.db file located in localFluent.Increleasefluent6.2.16cpropepdatathermo.db to your local working directory. 2. Edit this by appending new species using the NASA 14-coefficient format and save. 3. Create a CHEMKIN mechanism file by copying a sample file (eg. /usr/local/Fluent.Inc/release/prepdf4.1.4/db/hydrogen18.che) and providing the reactions with their Arrhenius reaction kinetic constants. 4. Switch on the Non-premixed model through Define>Models>Species>Transport&Reaction and click on Non-premixed combustion. 5. Switch on Create Table under PDF options. 6. Switch on the Steady Flamelets model at the chemistry tab. 7. You may now import the CHEMKIN Mechanism and thermodynamics by clicking on the Import button when Create Flamelet is selected. 8. Provide the thermo.db in your working directory as the Thermodynamic database file and your CHEMKIN reaction mechanism file (*.che) and hit Import 9. At the Boundary tab, provide the mass fractions of fuel and oxidiser and Apply. 10. Generate the flamlets by visiting the Flamlets tab and click at Calculate Flamlets. You may want to change the flamelet library settings on the same form before calculating. 11. Create the PDF table by visiting the Table tab and click Calculate PDF Table. 12. You may display the PDF table by Display>PDF Tables/Curves 13. Save the PDF file at File>Write>PDF... 14. Setup the boundary conditions and solver controls and start iterating UNSTEADY LAMINAR FLAMELET: 1. Copy the thermo.db file located in localFluent.Increleasefluent6.2.16cpropepdatathermo.db to your local working directory. 2. Edit this by appending new species using the NASA 14-coefficient format and save. 3. Create a CHEMKIN mechanism file by copying a sample file (eg. /usr/local/Fluent.Inc/release/prepdf4.1.4/db/hydrogen18.che) and providing the reactions with their Arrhenius reaction kinetic constants. 4. Switch on the Non-premixed model through Define>Models>Species>Transport&Reaction and click on Non-premixed combustion. 5. Switch on Create Table under PDF options. 6. Switch on the Unsteady Flamelets model at the chemistry tab. 7. You may now import the CHEMKIN Mechanism and thermodynamics by clicking on the Import button when Create Flamelet is selected. 8. Provide the thermo.db in your working directory as the Thermodynamic database file and your CHEMKIN reaction mechanism file (*.che) and hit Import 9. At the Boundary tab, provide the mass fractions of fuel and oxidiser and Apply. 10. At the Flamelet tab, you will have to generate Unsteady Flamelets for each of the Slow product species by clicking at Create Unsteady Flamelets. Provide appropriate residence time and scalar dissipation for each of scalars.You may save the flamelet libraries for repeated use. 11. Create the PDF table by visiting the Table tab and click Calculate PDF Table. 12. You may display the PDF table by Display>PDF Tables/Curves 13. Save the PDF file at File>Write>PDF... 14. Setup the boundary conditions and solver controls and start iterating |
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