[saeed jamshidi]

Hello,

I have simulated flow around a cylinder in turbulent flow (Re=2*10^5) with the K- omega SST in 3D.
However, I have a question about the vorticity field that I have attached. Why there is such let's say noise in the area where I have shown by arrow?!!

I am going to share my fvsolution and fvscheme to have a better discusion.
Could you give me general advice on this matter?

Thank you.

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2106                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

solvers
{
    p
    {
        solver          GAMG;
        smoother        DICGaussSeidel;
        tolerance       1e-06;
        relTol          0.05;
    }

    pFinal
    {
        $p;
        relTol          0;
    }

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

    "(U|k|omega|s)Final"
    {
        $U;
        relTol          0;
    }
}


SIMPLE
{
    nNonOrthogonalCorrectors 0;
    pRefCell        0;
    pRefValue       0;
}

PIMPLE
{
    nOuterCorrectors 1;
    nCorrectors      3;
    nNonOrthogonalCorrectors 1;
    pRefCell        0;
    pRefValue       0;
	momentumPredictor yes;
	correctPhi no;
}

relaxationFactors
{
    fields
    {
    }
    equations
    {
        ".*"        1;
    }
}


// ************************************************************************* //

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2112                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      fvSchemes;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

ddtSchemes
{
    default         backward;
}

gradSchemes
{
    default         Gauss linear;
    grad(p)         Gauss linear;
}

divSchemes
{
    default         none;

    div(phi,U)      Gauss linear;

    div(phi,k)      Gauss limitedLinear 1;

    div(phi,omega) Gauss limitedLinear 1;
	
	div(phi,s) Gauss limitedLinear 1;

    div((nuEff*dev2(T(grad(U))))) Gauss linear;
}

laplacianSchemes
{
    default         Gauss linear corrected;
}

interpolationSchemes
{
    default         linear;
}

snGradSchemes
{
    default         corrected;
}

wallDist
{
    method          meshWave;
    nRequired       yes;
}


// ************************************************************************* //