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setting nutilda boundary condition for LES

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Old   October 28, 2023, 05:32
Exclamation setting nutilda boundary condition for LES
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Saeed Jamshidi
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Hello,

I'm going to adapt nutilda in 0 folder for my simulation, but I don't know how can I do it?!

Although I'v read lots of materials about it, I couldn't reach a conclusion.

there are various boundary types for nutilda, such as symmetry, fixedValue ...

what is the type of nutilda for slip boundary???

please, provide me some information regarding this.

Any ideas are welcome.
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Old   October 28, 2023, 09:53
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I am confused as to why you are talking about nutilda, i.e. the Spalart Allmaras model, for an LES simulation ... but as for your question: a slip boundary is the same as a symmetry plane (think about what the two conditions mean - they are equivalent). So just apply a symmetry boundary.
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Old   October 28, 2023, 10:29
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Dear Tobermory, thank for the reply.

I just want to run pitzdaily problem in the below tutorial:

Code:
\\wsl.localhost\Ubuntu-18.04\home\myfoam\OpenFOAM\myfoam-v2112\run\tutorials\incompressible\pisoFoam\LES\pitzDaily\0
which nutilda was there by default.

Besides, by searching among other tutorials I found zerogradient type for slip boundary condition.
Here is the turbulence model


turbulenceProperties:
Code:
/*--------------------------------*- 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      turbulenceProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

simulationType      LES;

LES
{
    LESModel        dynamicKEqn;

    turbulence      on;

    printCoeffs     on;

    delta           cubeRootVol;

    dynamicKEqnCoeffs
    {
        filter simple;
    }

    cubeRootVolCoeffs
    {
        deltaCoeff      1;
    }

    PrandtlCoeffs
    {
        delta           cubeRootVol;
        cubeRootVolCoeffs
        {
            deltaCoeff      1;
        }

        smoothCoeffs
        {
            delta           cubeRootVol;
            cubeRootVolCoeffs
            {
                deltaCoeff      1;
            }

            maxDeltaRatio   1.1;
        }

        Cdelta          0.158;
    }

    vanDriestCoeffs
    {
        delta           cubeRootVol;
        cubeRootVolCoeffs
        {
            deltaCoeff      1;
        }

        smoothCoeffs
        {
            delta           cubeRootVol;
            cubeRootVolCoeffs
            {
                deltaCoeff      1;
            }

            maxDeltaRatio   1.1;
        }

        Aplus           26;
        Cdelta          0.158;
    }

    smoothCoeffs
    {
        delta           cubeRootVol;
        cubeRootVolCoeffs
        {
            deltaCoeff      1;
        }

        maxDeltaRatio   1.1;
    }
}


// ************************************************************************* //
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Old   October 28, 2023, 10:32
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Yep - zeroGradient is the correct one - that gives a symmetry condition.
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