# Covergence Problem with simpleFoam

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 February 4, 2013, 12:11 Covergence Problem with simpleFoam #1 Senior Member     Marco Longhitano Join Date: Jan 2013 Location: Aachen Posts: 103 Rep Power: 5 Hi Foamers, we are simulating a valve with simpleFoam! We have carried out the first simulation by using a first order (upwind) numerical schems for divergence. So, we have switched it with a second order one (Gauss Linear). Here appears many problems with convergence!! Anyone knows how set properly fvSchemes in order to have a seocnd order accurancy?? Here is our fvSchemes and fvSolutiuon: ddtSchemes { default steadyState; } gradSchemes { default cellLimited Gauss linear 1; grad(p) cellLimited Gauss linear 1; grad(U) cellLimited Gauss linear 1; grad(omega) cellLimited Gauss linear 1; grad(k) cellLimited Gauss linear 1; } divSchemes { default none; div(phi,U) Gauss linearUpwindV cellMDLimited Gauss linear 1; div(phi,k) Gauss linearUpwind cellLimited Gauss linear 1; div(phi,omega) Gauss linearUpwind cellLimited Gauss linear 1; div((nuEff*dev(T(grad(U))))) Gauss linear; } laplacianSchemes { default none; laplacian(nuEff,U) Gauss linear limited 0.5; laplacian((1|A(U)),p) Gauss linear limited 0.5; laplacian(DkEff,k) Gauss linear limited 0.5; laplacian(DepsilonEff,epsilon) Gauss linear limited 0.5; laplacian(DomegaEff,omega) Gauss linear limited 0.5; laplacian(DREff,R) Gauss linear limited 0.5; laplacian(DnuTildaEff,nuTilda) Gauss linear limited 0.5; } interpolationSchemes { default linear; interpolate(U) linear; } snGradSchemes { default corrected; } fluxRequired { default no; p ; } __________________________________________________ ______- solvers { p { solver GAMG; tolerance 1e-08; relTol 0.05; smoother GaussSeidel; nPreSweeps 0; nPostSweeps 2; cacheAgglomeration true; agglomerator faceAreaPair; nCellsInCoarsestLevel 10; mergeLevels 1; } U { solver smoothSolver; smoother GaussSeidel; tolerance 1e-08; relTol 0.1; nSweeps 1; } k { solver smoothSolver; smoother GaussSeidel; tolerance 1e-08; relTol 0.01; nSweeps 1; } omega { solver smoothSolver; smoother GaussSeidel; tolerance 1e-08; relTol 0.01; nSweeps 1; } } SIMPLE { nNonOrthogonalCorrectors 2; residualControl { p 1e-5; U 1e-5; k 1e-5; omega 1e-5; } } relaxationFactors { default 0; p 0.3; U 0.7; k 0.7; omega 0.7; nut 0.7; } } Thx Regards Marco

 February 6, 2013, 08:31 #2 Senior Member     Marco Longhitano Join Date: Jan 2013 Location: Aachen Posts: 103 Rep Power: 5 Hi Foamers, no one has an idea about which problem could be??? Pleaseee answer!! Regards Marco

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