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transient laminar free-convection flow

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Old   August 17, 2016, 11:30
Default transient laminar free-convection flow
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A. Min
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Hi dears

I want to solve a transient laminar free-convection flow and heat transfer of water around a cylinder.
1- I select buoyantBussinesqPimpleFoam. Is it correct?
2- I solved it but the results are wrong! i.e. I have very small amount of velocity! in order of 10^-9 !! Whats the problem?
3- If I solve my problem by the assumption of turbulent flow, it will give me correct answers!!

- my openFoam version: 2.3.1
- endtime=1000
- deltat=1, 0.01, 0.001 (non of them gave me correct answer)
- div schemes: Gauss linear, bounded Gauss linear, bounded Gauss linearUpwind(non of them gave me correct answer)



FvSolution:
solvers
{
p_rgh
{
solver PCG;
preconditioner DIC;
tolerance 1e-8;
relTol 0.01;
}

p_rghFinal
{
$p_rgh;
relTol 0;
}

"(U|T|k|epsilon|R)"
{
solver PBiCG;
preconditioner DILU;
tolerance 1e-6;
relTol 0.1;
}

"(U|T|k|epsilon|R)Final"
{
$U;
relTol 0;
}
}

PIMPLE
{
momentumPredictor no;
nOuterCorrectors 1;
nCorrectors 2;
nNonOrthogonalCorrectors 0;
pRefCell 0;
pRefValue 0;
}

relaxationFactors
{
fields
{
}
equations
{
"(U|T|k|epsilon|R)" 0.9;
"(U|T|k|epsilon|R)Final" 0.9;
}
}




FvSchems:

ddtSchemes
{
default Euler;
}

gradSchemes
{
default Gauss linear;
}

divSchemes
{
default none;
//vanleer; //bounded Gauss upwind; linearUpwind;
div(phi,U) bounded Gauss linearUpwind grad(U);
div(phi,T) bounded Gauss linearUpwind grad(T);
div(phi,k) bounded Gauss linearUpwind;
div(phi,epsilon) bounded Gauss linearUpwind;
div(phi,R) bounded Gauss linearUpwind;
div(R) bounded Gauss linearUpwind;
div((nuEff*dev(T(grad(U))))) Gauss linear;
}

laplacianSchemes
{
default Gauss linear corrected;
}

interpolationSchemes
{
default linear;
}

snGradSchemes
{
default corrected;
}

fluxRequired
{
default no;
p_rgh ;
}
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flow, free-convection, laminar, openfoam, transient

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