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SIMPLEC (SIMPLE-consistent) is selected by setting "consistent" option true/yes:
SIMPLE
{
nNonOrthogonalCorrectors 0;
consistent yes;
}
which relaxes the pressure in a "consistent" manner and additional
relaxation of the pressure is not generally necessary. In addition
convergence of the p-U system is better and reliable with less
aggressive relaxation of the momentum equation, e.g. for the motorbike
tutorial:
relaxationFactors
{
equations
{
U 0.9;
k 0.7;
omega 0.7;
}
}
The cost per iteration is marginally higher but the convergence rate is
better so the number of iterations can be reduced.
The SIMPLEC algorithm also provides benefit for cases with large
body-forces, e.g. SRF, see tutorials/incompressible/SRFSimpleFoam/mixer
and feature request http://www.openfoam.org/mantisbt/view.php?id=1714
93 lines
2.0 KiB
C++
93 lines
2.0 KiB
C++
/*--------------------------------*- C++ -*----------------------------------*\
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| ========= | |
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| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
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| \\ / O peration | Version: dev |
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| \\ / A nd | Web: www.OpenFOAM.org |
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| \\/ M anipulation | |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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version 2.0;
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format ascii;
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class dictionary;
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object fvSolution;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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solvers
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{
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p
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{
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solver GAMG;
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tolerance 1e-7;
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relTol 0.01;
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smoother GaussSeidel;
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nPreSweeps 0;
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nPostSweeps 2;
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cacheAgglomeration on;
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agglomerator faceAreaPair;
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nCellsInCoarsestLevel 10;
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mergeLevels 1;
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}
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Phi
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{
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$p;
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}
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U
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{
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solver smoothSolver;
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smoother GaussSeidel;
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tolerance 1e-8;
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relTol 0.1;
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nSweeps 1;
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}
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k
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{
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solver smoothSolver;
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smoother GaussSeidel;
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tolerance 1e-8;
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relTol 0.1;
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nSweeps 1;
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}
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omega
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{
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solver smoothSolver;
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smoother GaussSeidel;
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tolerance 1e-8;
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relTol 0.1;
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nSweeps 1;
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}
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}
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SIMPLE
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{
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nNonOrthogonalCorrectors 0;
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consistent yes;
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}
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potentialFlow
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{
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nNonOrthogonalCorrectors 10;
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}
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relaxationFactors
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{
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equations
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{
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U 0.9;
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k 0.7;
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omega 0.7;
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}
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}
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cache
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{
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grad(U);
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}
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// ************************************************************************* //
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