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Uncertain k values with multiphaseStabilizedTurbulence

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Old   April 27, 2020, 11:21
Default Uncertain k values with multiphaseStabilizedTurbulence
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Grivalszki Péter
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Hi!

I have uncertain k values from my multiphase simulations.
I used the new multiphaseStabilizedTurbulence fvOption to get correct k everywhere. Unfortunatelly, I did not get the k values I expected. On my graphs, one can see average k in specified verticals. The green line shows the result I expect, but If I refine my mesh, the k values are not better, but worse. Why is it? Do I have to use different BCs, or is there a mistake in the fvOptions?
I have a RAS with k-omega SST turbulence closure, and I use kqRWallFunction on the walls. For free surface capturing, I use isoAdvector (interIsoFoam).

Thank you in advance!

Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1812                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      fvOptions;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

    multiphaseStabilizedTurbulence1
    {
        type            multiphaseStabilizedTurbulence;
        active          yes;

        multiphaseStabilizedTurbulenceCoeffs
        {
            // Optional coefficients
            lambda2         0.1;   // A value of 0 sets the nut correction to 0
            Cmu             0.09;  // from k-epsilon model
            C               1.51;  // from k-omega model
            alpha           1.36;  // 1/Prt
        }
    }


// ************************************************************************* //
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File Type: jpg 02.jpg (115.8 KB, 10 views)

Last edited by GrivalszkiP; April 27, 2020 at 11:24. Reason: text mistake
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Old   August 22, 2022, 00:58
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Juwon Jang
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Hi what CFD problem it is?
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Tags
interisofoam, isoadvector, kqrwallfunction, refinement, stabilizedturbulence

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