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Why my force values on the half patch are very high ? |
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July 6, 2023, 21:15 |
Why my force values on the half patch are very high ?
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Rishabh Kumar
Join Date: Sep 2017
Posts: 9
Rep Power: 9 |
I'm trying to simulate fluid flow over a hull to calculate it's resistace, the issue is i'm getting unusual high value of resistance on the hull patch.
I'm using interFoam on openFOAM2212. I have around 6 mil cells with very poor generatoin of layers, I tried a lot to improve the layer additions using snappyhexmesh but to no avail. I need suggestions, why my force values on the half patch are very high ? controldict ================================================ application interFoam; startFrom startTime; startTime 0; stopAt endTime; endTime 4000; deltaT 1; writeControl timeStep; writeInterval 100; purgeWrite 0; writeFormat binary; writePrecision 6; writeCompression off; timeFormat general; timePrecision 6; runTimeModifiable yes; functions { forces { type forces; libs (forces); patches (hull); log on; writeControl timeStep; writeInterval 1; CofR (0 0 0); } } FVschemes ================================================== ddtSchemes { default localEuler; } gradSchemes { default Gauss linear; limitedGrad cellLimited Gauss linear 1; } divSchemes { div(rhoPhi,U) Gauss linearUpwind grad(U); div(phi,alpha) Gauss vanLeer; div(phirb,alpha) Gauss linear; div(phi,k) Gauss linearUpwind limitedGrad; div(phi,omega) Gauss linearUpwind limitedGrad; div(((rho*nuEff)*dev2(T(grad(U))))) Gauss linear; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } wallDist { method meshWave; } FVSolution ================================================== ===== solvers { "alpha.water.*" { nAlphaCorr 2; nAlphaSubCycles 1; cAlpha 1; icAlpha 0; MULESCorr yes; nLimiterIter 10; alphaApplyPrevCorr yes; solver smoothSolver; smoother symGaussSeidel; tolerance 1e-8; relTol 0; minIter 1; } "pcorr.*" { solver PCG; preconditioner { preconditioner GAMG; smoother GaussSeidel; tolerance 1e-5; relTol 0; }; tolerance 1e-5; relTol 0; }; p_rgh { solver GAMG; smoother DIC; tolerance 1e-7; relTol 0.01; }; p_rghFinal { $p_rgh; relTol 0; } "(U|k|omega).*" { solver smoothSolver; smoother symGaussSeidel; nSweeps 1; tolerance 1e-7; relTol 0.1; minIter 1; }; } PIMPLE { momentumPredictor no; nOuterCorrectors 1; nCorrectors 2; nNonOrthogonalCorrectors 1; maxCo 10; maxAlphaCo 5; rDeltaTSmoothingCoeff 0.05; rDeltaTDampingCoeff 0.5; nAlphaSpreadIter 0; nAlphaSweepIter 0; maxDeltaT 1; } relaxationFactors { equations { ".*" 1; } } cache { grad(U); } |
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interfoam hull, openfoam 10, postprocessing; openfoam; |
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