5fd30443f3
The momentum equation central coefficient and drag matrix is formulated, inverted and used to eliminate the drag terms from each of the phase momentum equations which are combined for formulate a drag-implicit pressure equation. This eliminates the lagged drag terms from the previous formulation which significantly improves convergence for small particle and Euler-VoF high-drag cases. It would also be possible to refactor the virtual-mass terms and include the central coefficients of the phase acceleration terms in the drag matrix before inversion to further improve the implicitness of the phase momentum-pressure coupling for bubbly flows. This work is pending funding.
88 lines
1.8 KiB
C++
88 lines
1.8 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 | Website: https://openfoam.org
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\\ / A nd | Version: dev
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\\/ M anipulation |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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format ascii;
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class dictionary;
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location "system";
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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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"alpha.*"
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{
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nAlphaCorr 1;
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nAlphaSubCycles 2;
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}
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p_rgh
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{
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solver GAMG;
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smoother DIC;
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tolerance 1e-8;
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relTol 0;
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}
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p_rghFinal
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{
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$p_rgh;
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relTol 0;
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}
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"U.*"
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{
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solver smoothSolver;
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smoother symGaussSeidel;
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tolerance 1e-5;
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relTol 0;
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minIter 1;
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}
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"e.*"
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{
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solver smoothSolver;
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smoother symGaussSeidel;
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tolerance 1e-8;
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relTol 0;
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minIter 1;
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}
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"(k|epsilon).*"
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{
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solver smoothSolver;
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smoother symGaussSeidel;
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tolerance 1e-7;
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relTol 0;
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minIter 1;
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}
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}
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PIMPLE
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{
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nOuterCorrectors 3;
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nCorrectors 1;
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nNonOrthogonalCorrectors 0;
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faceMomentum no;
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VmDdtCorrection yes;
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dragCorrection yes;
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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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".*" 1;
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}
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}
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// ************************************************************************* //
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