| AntonioMezzacapo |
August 29, 2022 04:00 |
rhoPimpleFoam simulation too slow
Greetings all, I am carrying on an unsteady turbulent 3D wind turbine blade simulation, using rhoPimpleFoam solver. I noticed my simulation takes many time to run . I read somewhere I might use some preconditioner in order to speed my simulation up.
I used: solver PCG; preconditioner DIC; for pressure
solver PBiCGStab preconditioner DILU; for velocity
but after a while my time step decreaes and the simulation becames instable.
Do you have any advices in order to speed it up? Thanks!
Code:
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 8
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
location "system";
object fvSchemes;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
ddtSchemes
{
default Euler;
}
gradSchemes
{
default Gauss linear;
limited cellLimited Gauss linear 1;
grad(U) $limited;
grad(k) $limited;
grad(omega) $limited;
}
divSchemes
{
default none;
div(phi,h) Gauss linearUpwind limited;
div(phi,U) Gauss linearUpwind limited;
div(meshPhi,p) Gauss linearUpwind limited;
turbulence Gauss linearUpwind limited;
energy Gauss linearUpwind limited;
div(phi,k) $turbulence;
div(phi,omega) $turbulence;
div(phi,e) $energy;
div(phi,K) $energy;
div(phi,Ekp) $energy;
div(phi,(p|rho)) $energy;
div((phi|interpolate(rho)),p) Gauss upwind;
div(((rho*nuEff)*dev2(T(grad(U))))) Gauss linear;
}
laplacianSchemes
{
default Gauss linear corrected;
}
interpolationSchemes
{
default linear;
}
snGradSchemes
{
default corrected;
}
wallDist
{
method meshWave;
}
// ************************************************************************* //
Code:
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 8
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
location "system";
object fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
solvers
{
p
{
solver smoothSolver;
smoother symGaussSeidel;
tolerance 1e-12;
relTol 0.01;
}
pFinal
{
$p;
relTol 0;
}
"pcorr.*"
{
$p;
tolerance 1e-2;
relTol 0;
}
"(rho|e|U|h|k|epsilon|omega|eFinal|ecorr.*)"
{
solver smoothSolver;
smoother symGaussSeidel;
tolerance 1e-06;
relTol 0.1;
}
"(rho|U|h|k|epsilon|omega)Final"
{
$U;
relTol 0;
}
}
PIMPLE
{
momentumPredictor yes;
transonic no;
nOuterCorrectors 3;
nCorrectors 1;
nNonOrthogonalCorrectors 0;
}
relaxationFactors
{
equations
{
"(U|h|k|epsilon|omega).*" 1;
}
}
// ************************************************************************* //
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