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July 2, 2014, 11:41 |
Constant rho in compressible solver
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#1 |
New Member
kamil
Join Date: Jun 2014
Posts: 11
Rep Power: 12 |
I'm solving simple case with flow in сoaxial circular tube, and found one strange problem.
The problem is that rho field is constant and equals 1 everywhere except walls. Although using equation of state density must be near 1.12. Solver is rhoSimplecFoam. fvSolution: Code:
solvers { p { solver GAMG; tolerance 1e-08; relTol 0.1; smoother GaussSeidel; nPreSweeps 0; nPostSweeps 2; nFinestSweeps 2; cacheAgglomeration true; nCellsInCoarsestLevel 20; agglomerator faceAreaPair; mergeLevels 1; } "(U|h|k|epsilon)" { solver GAMG; tolerance 1e-08; relTol 0.1; smoother GaussSeidel; nPreSweeps 0; nPostSweeps 2; nFinestSweeps 2; cacheAgglomeration true; nCellsInCoarsestLevel 20; agglomerator faceAreaPair; mergeLevels 1; } } SIMPLE { nNonOrthogonalCorrectors 0; rhoMin rhoMin [1 -3 0 0 0] 0.1; rhoMax rhoMax [1 -3 0 0 0] 1.0; transonic no; } relaxationFactors { fields { p 1; rho 1; } equations { U 0.9; h 0.8; k 0.9; epsilon 0.9; } } Code:
thermoType hPsiThermo<pureMixture<sutherlandTransport<specieThermo<hConstThermo<perfectGas>>>>>; mixture { specie { nMoles 1; molWeight 28.9; } thermodynamics { Cp 1007; Hf 0; } transport { As 1.4792e-06; Ts 116; } } P. S. Sorry for my English. Last edited by zaripov; July 2, 2014 at 13:32. |
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July 2, 2014, 15:57 |
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#2 |
Senior Member
Nima Samkhaniani
Join Date: Sep 2009
Location: Tehran, Iran
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well in fvSolution you defined the min and max of density , increase rhoMax, forexample put it 2
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July 3, 2014, 05:13 |
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#3 |
New Member
kamil
Join Date: Jun 2014
Posts: 11
Rep Power: 12 |
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Tags |
density, rho, rhosimplecfoam |
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