| guserik |
January 26, 2014 10:19 |
Time step continuity
Hello
I got problem with time step continuity when try to run rhoPimpleFoam, i have 2 regions with 8 bar in pressure differnce. When i start my simulation i got really high error directly in the second iteration step. I have tried to change alot of parameters in my fvSolution and fvSchemes without any sucess.
Code:
time step continuity errors : sum local = 0.463969, global = -0.463969, cumulative = -5.10366
rho max/min : 6.5 1.05679
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.2.2 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object fvSchemes;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
ddtSchemes
{
default Euler;
}
gradSchemes
{
default Gauss linear;
}
divSchemes
{
default none;
div(phi,U) Gauss upwind limited 1;
div(phi,h) Gauss upwind;
div(phi,k) Gauss upwind;
div(phi,epsilon) Gauss upwind;
div((muEff*dev2(T(grad(U))))) Gauss linear;
div(phi,K) Gauss linear;
}
laplacianSchemes
{
default none;
laplacian(muEff,U) Gauss linear corrected;
laplacian(Dp,p) Gauss linear corrected;
laplacian(alphaEff,h) Gauss linear corrected;
laplacian(DkEff,k) Gauss linear corrected;
laplacian(DepsilonEff,epsilon) Gauss linear corrected;
}
interpolationSchemes
{
default linear;
interpolate(U) linear;
}
snGradSchemes
{
default corrected;
}
fluxRequired
{
default yes;
p ;
}
// ************************************************************************* //
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.2.2 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
solvers
{
rho
{
solver PCG;
preconditioner DIC;
tolerance 1e-10;
relTol 0;
}
rhoFinal
{
$rho;
tolerance 1e-10;
relTol 0;
}
U
{
solver smoothSolver;
smoother GaussSeidel;
nSweeps 2;
tolerance 1e-10;
relTol 0;
}
UFinal
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0.01;
}
p
{
solver GAMG;
tolerance 1e-11;
relTol 0;
smoother GaussSeidel;
nPreSweeps 1;
nPostSweeps 1;
cacheAgglomeration true;
nCellsInCoarsestLevel 100;
agglomerator faceAreaPair;
mergeLevels 1;
maxIter 1500;
}
pFinal
{
$p;
relTol 0;
}
h
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0;
}
hFinal
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0;
}
"(k|epsilon)"
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-5;
relTol 0.1;
}
"(k|epsilon)Final"
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-10;
relTol 0.1;
}
}
PIMPLE
{
nOuterCorrectors 3;
nCorrectors 3;
nNonOrthogonalCorrectors 1;
momentumPredictor yes;
rhoMin rhoMin [ 1 -3 0 0 0 ] 0.5;
rhoMax rhoMax [ 1 -3 0 0 0 ] 6.5;
}
relaxationFactors
{
default 0; //Other tries :
p 0.01; // 0.3 0.2 0.3
U 0.01; // 0.5 0.2 0.5
nuTilda 0.7; // 0.6 0.4 0.6
h 0.01; // 0.6 0.4 0.3
rho 0.05; // 0.05 0.05 0.025
hFinal 0.01; // 0.6 0.6 0.3
"(U|nuTilda)Final" 0.07; // 0.6 0.4 0.6
}
// ************************************************************************* //
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