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Pressure Residue Fluctuations

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Old   November 21, 2022, 04:17
Default Pressure Residue Fluctuations
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ron kenneth
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Hi
I am trying to run external aerodynamics of a Car ( SimpleFoam, RAS k-omegaSST with turbulence on)

I have ran the simulation for 5000 timesteps, but the pressure residue keeps on Fluctuating even though k,Ux,Uy,Uz have become steady.

This is the FV scheme I am currently using.
I have tried using LES model as well but getting somewhat similar results

FoamFile
{
version 2.0;
class dictionary;
format ascii;
location "system";
object fvSchemes;
}
ddtSchemes
{
default steadyState;
}
gradSchemes
{
default cellLimited Gauss linear 1.0;
}
divSchemes
{
div((nuEff*dev2(T(grad(U))))) Gauss linear;
div(R) Gauss linear;
default bounded Gauss upwind;
div(phi,U) bounded Gauss upwind;
div(phi,k) bounded Gauss upwind;
div(phi,omega) bounded Gauss upwind;
}
laplacianSchemes
{
default Gauss linear corrected;
}
interpolationSchemes
{
default linear;
}
snGradSchemes
{
default corrected;
}
fluxRequired
{
default no;
p ;
}
wallDist
{
method meshWave;
nRequired false;
}

Please Help its been a long since I have found answer to this.
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Old   November 21, 2022, 05:00
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ron kenneth
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fv Solution

FoamFile
{
version 2.0;
class dictionary;
format ascii;
location "system";
object fvSolution;
}
solvers
{
p
{
solver GAMG;
smoother GaussSeidel;
relTol 0.01;
cacheAgglomeration true;
nFinestSweeps 2;
nPreSweeps 0;
maxIter 100;
nPostSweeps 1;
agglomerator faceAreaPair;
nCellsInCoarsestLevel 10;
tolerance 1.0E-6;
mergeLevels 1;
}
U
{
solver PBiCGStab;
relTol 0.1;
preconditioner DILU;
tolerance 1.0E-6;
maxIter 100;
}
k
{
solver PBiCGStab;
relTol 0.1;
preconditioner DILU;
tolerance 1.0E-6;
maxIter 100;
}
omega
{
solver PBiCGStab;
relTol 0.1;
preconditioner DILU;
tolerance 1.0E-6;
maxIter 100;
}
}
SIMPLE
{
consistent true;
nNonOrthogonalCorrectors 1;
residualControl
{
p 1.0E-6;
U 1.0E-6;
k 1.0E-6;
omega 1.0E-6;
}
pRefCell 0;
pRefValue 0.0;
}
relaxationFactors
{
p 0.2;
U 0.2;
k 0.2;
omega 0.2;
}
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convergence, openfoam, pressure residual, residue, simplefoam convergence

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