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#1 |
New Member
ron kenneth
Join Date: Oct 2022
Posts: 3
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Hi
I am trying to run external aerodynamics of a Car ( SimpleFoam, RAS k-omegaSST with turbulence on) I have ran the simulation for 5000 timesteps, but the pressure residue keeps on Fluctuating even though k,Ux,Uy,Uz have become steady. This is the FV scheme I am currently using. I have tried using LES model as well but getting somewhat similar results FoamFile { version 2.0; class dictionary; format ascii; location "system"; object fvSchemes; } ddtSchemes { default steadyState; } gradSchemes { default cellLimited Gauss linear 1.0; } divSchemes { div((nuEff*dev2(T(grad(U))))) Gauss linear; div(R) Gauss linear; default bounded Gauss upwind; div(phi,U) bounded Gauss upwind; div(phi,k) bounded Gauss upwind; div(phi,omega) bounded Gauss upwind; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } fluxRequired { default no; p ; } wallDist { method meshWave; nRequired false; } Please Help its been a long since I have found answer to this. |
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#2 |
New Member
ron kenneth
Join Date: Oct 2022
Posts: 3
Rep Power: 3 ![]() |
fv Solution
FoamFile { version 2.0; class dictionary; format ascii; location "system"; object fvSolution; } solvers { p { solver GAMG; smoother GaussSeidel; relTol 0.01; cacheAgglomeration true; nFinestSweeps 2; nPreSweeps 0; maxIter 100; nPostSweeps 1; agglomerator faceAreaPair; nCellsInCoarsestLevel 10; tolerance 1.0E-6; mergeLevels 1; } U { solver PBiCGStab; relTol 0.1; preconditioner DILU; tolerance 1.0E-6; maxIter 100; } k { solver PBiCGStab; relTol 0.1; preconditioner DILU; tolerance 1.0E-6; maxIter 100; } omega { solver PBiCGStab; relTol 0.1; preconditioner DILU; tolerance 1.0E-6; maxIter 100; } } SIMPLE { consistent true; nNonOrthogonalCorrectors 1; residualControl { p 1.0E-6; U 1.0E-6; k 1.0E-6; omega 1.0E-6; } pRefCell 0; pRefValue 0.0; } relaxationFactors { p 0.2; U 0.2; k 0.2; omega 0.2; } |
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Tags |
convergence, openfoam, pressure residual, residue, simplefoam convergence |
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