T721_01 OpenFoam pitzDaily

T721_016 rho LES pitzDaily

この記事は約18分で読めます。

OpenFoamのサンプル確認(パラメータやキーワードの覚書)です。

バージョン : Windows版(OpenFOAM-v2106-windows-mingw.exe)

チュートリアルフォルダ:チュートリアル場所(windows)

引用元

<チュートリアルフォルダ>\compressible\rhoPimpleFoam\LES\pitzDaily

結果図

流速 下段温度

流体速度のモデルになります。

作業

基本的な流れはT703 OpenFoam tipsと同じです。(または作業

//チュートリアルからサンプルをコピーしておきます。//

//コマンド:メッシュ作成
blockMesh

//計算実行//
rhoPimpleFoam

//ParaView用VTK変換//
foamToVTK

モデル

設定値の抜粋まとめ

全体構造

//初期フォルダ・ファイル構成
pitzDaily                  
├ 0                       
│ ├ alphat               
│ ├ k                                 
│ ├ muTilda
│ ├ nut                  
│ ├ p       
│ ├ T    
│ └ U                    
├ constant                
│ ├ transportProperties  :物性値
│ ├ thermophysicalProperties : 物性値
│ └ turbulenceProperties  :乱流設定
└ system                  
   ├ blockMeshDict        :ブロックメッシュ定義
   ├ controlDict          :解析ジョブ設定
   ├ fvSchemes            :ソルバー設定
   └ fvSolution           :ソルバー設定

0

設定確認 alphat

//ファイル:alphat//

dimensions      [1 -1 -1 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            zeroGradient;
    }

    upperWall
    {
        type            zeroGradient;
    }

    lowerWall
    {
        type            zeroGradient;
    }

    frontAndBack
    {
        type            empty;
    }
}

設定確認 k

dimensions      [0 2 -2 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform 2e-05;
    }

    outlet
    {
        type            inletOutlet;
        inletValue      uniform 0;
        value           uniform 0;
    }

    upperWall
    {
        type            fixedValue;
        value           uniform 0;
    }

    lowerWall
    {
        type            fixedValue;
        value           uniform 0;
    }

    frontAndBack
    {
        type            empty;
    }
}

設定確認 muTilda

dimensions      [1 -1 -1 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform 0;
    }

    outlet
    {
        type            inletOutlet;
        inletValue      uniform 0;
        value           uniform 0;
    }

    upperWall
    {
        type            fixedValue;
        value           uniform 0;
    }

    lowerWall
    {
        type            fixedValue;
        value           uniform 0;
    }

    frontAndBack
    {
        type            empty;
    }
}

設定確認 nut

dimensions      [0 2 -1 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            zeroGradient;
    }

    upperWall
    {
        type            zeroGradient;
    }

    lowerWall
    {
        type            zeroGradient;
    }

    frontAndBack
    {
        type            empty;
    }
}

設定確認 p

dimensions      [1 -1 -2 0 0 0 0];

internalField   uniform 1e5;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            waveTransmissive;
        psi             thermo:psi;
        gamma           1.3;
        fieldInf        1e5;
        lInf            0.3;
        value           $internalField;
    }

    upperWall
    {
        type            zeroGradient;
    }

    lowerWall
    {
        type            zeroGradient;
    }

    frontAndBack
    {
        type            empty;
    }
}

設定確認 T

dimensions      [0 0 0 1 0 0 0];

internalField   uniform 300;

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform 300;
    }

    outlet
    {
        type            inletOutlet;
        inletValue      uniform 300;
        value           uniform 300;
    }

    upperWall
    {
        type            fixedValue;
        value           uniform 300;
    }

    lowerWall
    {
        type            fixedValue;
        value           uniform 300;
    }

    frontAndBack
    {
        type            empty;
    }
}

設定確認 U

dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0 0 0);

boundaryField
{
    inlet
    {
        type            turbulentInlet;
        referenceField  uniform (10 0 0);
        fluctuationScale (0.02 0.01 0.01);
        value           uniform (10 0 0);
    }

    outlet
    {
        type            pressureInletOutletVelocity;
        inletValue      uniform (0 0 0);
        value           uniform (0 0 0);
    }

    upperWall
    {
        type            noSlip;
    }

    lowerWall
    {
        type            noSlip;
    }

    frontAndBack
    {
        type            empty;
    }
}

constant

設定確認 thermophysicalProperties

thermoType
{
    type            hePsiThermo;
    mixture         pureMixture;
    transport       const;
    thermo          eConst;
    equationOfState perfectGas;
    specie          specie;
    energy          sensibleInternalEnergy;
}

mixture
{
    specie
    {
        molWeight   28.9;
    }
    thermodynamics
    {
        Cv          712;
        Hf          0;
    }
    transport
    {
        mu          1.8e-05;
        Pr          0.7;
    }
}

設定確認 turbulenceProperties

simulationType      LES;

LES
{
    LESModel        kEqn;

    turbulence      on;

    printCoeffs     on;

    delta           cubeRootVol;

    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;
    }
}

system

設定確認 blockMeshDict

scale   0.001;

vertices
(
    (-20.6 0 -0.5)
    (-20.6 25.4 -0.5)
    (0 -25.4 -0.5)
    (0 0 -0.5)
    (0 25.4 -0.5)
    (206 -25.4 -0.5)
    (206 0 -0.5)
    (206 25.4 -0.5)
    (290 -16.6 -0.5)
    (290 0 -0.5)
    (290 16.6 -0.5)

    (-20.6 0 0.5)
    (-20.6 25.4 0.5)
    (0 -25.4 0.5)
    (0 0 0.5)
    (0 25.4 0.5)
    (206 -25.4 0.5)
    (206 0 0.5)
    (206 25.4 0.5)
    (290 -16.6 0.5)
    (290 0 0.5)
    (290 16.6 0.5)
);

negY
(
    (2 4 1)
    (1 3 0.3)
);

posY
(
    (1 4 2)
    (2 3 4)
    (2 4 0.25)
);

posYR
(
    (2 1 1)
    (1 1 0.25)
);


blocks
(
    hex (0 3 4 1 11 14 15 12)
    (18 30 1)
    simpleGrading (0.5 $posY 1)

    hex (2 5 6 3 13 16 17 14)
    (180 27 1)
    edgeGrading (4 4 4 4 $negY 1 1 $negY 1 1 1 1)

    hex (3 6 7 4 14 17 18 15)
    (180 30 1)
    edgeGrading (4 4 4 4 $posY $posYR $posYR $posY 1 1 1 1)

    hex (5 8 9 6 16 19 20 17)
    (25 27 1)
    simpleGrading (2.5 1 1)

    hex (6 9 10 7 17 20 21 18)
    (25 30 1)
    simpleGrading (2.5 $posYR 1)
);

edges
(
);

boundary
(
    inlet
    {
        type patch;
        faces
        (
            (0 1 12 11)
        );
    }
    outlet
    {
        type patch;
        faces
        (
            (8 9 20 19)
            (9 10 21 20)
        );
    }
    upperWall
    {
        type wall;
        faces
        (
            (1 4 15 12)
            (4 7 18 15)
            (7 10 21 18)
        );
    }
    lowerWall
    {
        type wall;
        faces
        (
            (0 3 14 11)
            (3 2 13 14)
            (2 5 16 13)
            (5 8 19 16)
        );
    }
    frontAndBack
    {
        type empty;
        faces
        (
            (0 3 4 1)
            (2 5 6 3)
            (3 6 7 4)
            (5 8 9 6)
            (6 9 10 7)
            (11 14 15 12)
            (13 16 17 14)
            (14 17 18 15)
            (16 19 20 17)
            (17 20 21 18)
        );
    }
);

設定確認 controlDict

application     rhoPimpleFoam;

startFrom       startTime;

startTime       0;

stopAt          endTime;

endTime         0.3;

deltaT          1e-05;

writeControl    timeStep;

writeInterval   100;

purgeWrite      10;

writeFormat     ascii;

writePrecision  6;

writeCompression off;

timeFormat      general;

timePrecision   6;

runTimeModifiable true;

adjustTimeStep  no;

maxCo           0.5;

functions
{
    fieldAverage1
    {
        type            fieldAverage;
        libs            (fieldFunctionObjects);
        writeControl    writeTime;

        fields
        (
            U
            {
                mean        on;
                prime2Mean  on;
                base        time;
            }

            p
            {
                mean        on;
                prime2Mean  on;
                base        time;
            }
        );
    }
}

設定確認 fvSchemes

ddtSchemes
{
    default         backward;
}

gradSchemes
{
    default         Gauss linear;
}

divSchemes
{
    default         none;

    div(phi,U)      Gauss LUST grad(U);

    div(phi,e)      Gauss LUST grad(e);
    div(phi,K)      Gauss linear;
    div(phiv,p)     Gauss linear;

    div(phi,k)      Gauss limitedLinear 1;
    div(phi,B)      Gauss limitedLinear 1;
    div(phi,muTilda) Gauss limitedLinear 1;
    div(B)          Gauss linear;

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

laplacianSchemes
{
    default         Gauss linear corrected;
}

interpolationSchemes
{
    default         linear;
}

snGradSchemes
{
    default         corrected;
}

設定確認 fvSolution

solvers
{
    "(p|rho)"
    {
        solver          PCG;
        preconditioner  DIC;
        tolerance       1e-6;
        relTol          0.01;
    }

    "(p|rho)Final"
    {
        $p;
        relTol          0;
    }

    "(U|e|k|nuTilda)"
    {
        solver          smoothSolver;
        smoother        symGaussSeidel;
        tolerance       1e-6;
        relTol          0.01;
    }

    "(U|e|k|nuTilda)Final"
    {
        $U;
        relTol          0;
    }
}

PIMPLE
{
    momentumPredictor yes;
    nOuterCorrectors 3;
    nCorrectors     1;
    nNonOrthogonalCorrectors 0;

    pMinFactor      0.5;
    pMaxFactor      2.0;
}

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


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