OpenFOAM

T721_033 buoBouPim hotRoom

この記事は約16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>\heatTransfer\buoyantBoussinesqPimpleFoam\hotRoom

結果図

流速表示

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。//
//0.origから0へ(.org削除)
//コマンド:メッシュ作成
blockMesh

//コマンド実行
setFields

//計算実行//
buoyantBoussinesqPimpleFoam

//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
hotRoom                    
├ 0.orig                  
│ ├ alphat               
│ ├ epsilon              
│ ├ k                    
│ ├ nut                  
│ ├ p                    
│ ├ p_rgh                
│ ├ T                    
│ └ U                    
├ constant                
│ ├ g                    
│ ├ transportProperties  :物性値
│ └ turbulenceProperties 
├ 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
│ └ setFieldsDict        
├ Allclean                
└ Allrun                     

0.orig

設定確認 alphat

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

internalField   uniform 0;

boundaryField
{
    floor
    {
        type            alphatJayatillekeWallFunction;
        Prt             0.85;
        value           uniform 0;
    }

    ceiling
    {
        type            alphatJayatillekeWallFunction;
        Prt             0.85;
        value           uniform 0;
    }

    fixedWalls
    {
        type            alphatJayatillekeWallFunction;
        Prt             0.85;
        value           uniform 0;
    }
}

epsilon

dimensions      [0 2 -3 0 0 0 0];

internalField   uniform 0.01;

boundaryField
{
    floor
    {
        type            epsilonWallFunction;
        value           uniform 0.01;
    }

    ceiling
    {
        type            epsilonWallFunction;
        value           uniform 0.01;
    }

    fixedWalls
    {
        type            epsilonWallFunction;
        value           uniform 0.01;
    }
}

k

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

internalField   uniform 0.1;

boundaryField
{
    floor
    {
        type            kqRWallFunction;
        value           uniform 0.1;
    }

    ceiling
    {
        type            kqRWallFunction;
        value           uniform 0.1;
    }

    fixedWalls
    {
        type            kqRWallFunction;
        value           uniform 0.1;
    }
}

nut

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

internalField   uniform 0;

boundaryField
{
    floor
    {
        type            nutkWallFunction;
        value           uniform 0;
    }

    ceiling
    {
        type            nutkWallFunction;
        value           uniform 0;
    }

    fixedWalls
    {
        type            nutkWallFunction;
        value           uniform 0;
    }
}

設定確認 p

//ファイル:p//

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

internalField   uniform 0;

boundaryField
{
    floor
    {
        type            calculated;
        value           $internalField;
    }

    ceiling
    {
        type            calculated;
        value           $internalField;
    }

    fixedWalls
    {
        type            calculated;
        value           $internalField;
    }
}

p_rgh

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

internalField   uniform 0;

boundaryField
{
    floor
    {
        type            fixedFluxPressure;
        rho             rhok;
        value           uniform 0;
    }

    ceiling
    {
        type            fixedFluxPressure;
        rho             rhok;
        value           uniform 0;
    }

    fixedWalls
    {
        type            fixedFluxPressure;
        rho             rhok;
        value           uniform 0;
    }
}

T

dimensions      [0 0 0 1 0 0 0];

internalField   uniform 300;

boundaryField
{
    floor
    {
        type            fixedValue;
        value           nonuniform List<scalar> 
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)
;
    }
    ceiling
    {
        type            fixedValue;
        value           uniform 300;
    }
    fixedWalls
    {
        type            zeroGradient;
    }
}

設定確認 U

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

internalField   uniform (0 0 0);

boundaryField
{
    floor
    {
        type            noSlip;
    }

    ceiling
    {
        type            noSlip;
    }

    fixedWalls
    {
        type            noSlip;
    }
}

constant

g

dimensions      [0 1 -2 0 0 0 0];
value           (0 -9.81 0);

設定確認 transportProperties

transportModel Newtonian;

// Laminar viscosity
nu              1e-05;

// Thermal expansion coefficient
beta            3e-03;

// Reference temperature
TRef            300;

// Laminar Prandtl number
Pr              0.7;

// Turbulent Prandtl number
Prt             0.85;

turbulenceProperties

simulationType      RAS;

RAS
{
    RASModel        kEpsilon;

    turbulence      on;

    printCoeffs     on;
}

system

設定確認 blockMeshDict

scale   1;

vertices
(
    (0 0 0)
    (10 0 0)
    (10 5 0)
    (0 5 0)
    (0 0 10)
    (10 0 10)
    (10 5 10)
    (0 5 10)
);

blocks
(
    hex (0 1 2 3 4 5 6 7) (20 10 20) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
    floor
    {
        type wall;
        faces
        (
            (1 5 4 0)
        );
    }
    ceiling
    {
        type wall;
        faces
        (
            (3 7 6 2)
        );
    }
    fixedWalls
    {
        type wall;
        faces
        (
            (0 4 7 3)
            (2 6 5 1)
            (0 3 2 1)
            (4 5 6 7)
        );
    }
);

mergePatchPairs
(
);

設定確認 controlDict

application     buoyantBoussinesqPimpleFoam;

startFrom       startTime;

startTime       0;

stopAt          endTime;

endTime         2000;

deltaT          2;

writeControl    timeStep;

writeInterval   200;

purgeWrite      0;

writeFormat     ascii;

writePrecision  6;

writeCompression off;

timeFormat      general;

timePrecision   6;

runTimeModifiable true;

adjustTimeStep  no;

maxCo           0.5;

設定確認 fvSchemes

ddtSchemes
{
    default         Euler;
}

gradSchemes
{
    default         Gauss linear;
}

divSchemes
{
    default         none;

    div(phi,U)      Gauss upwind;
    div(phi,T)      Gauss upwind;

    turbulence      Gauss upwind;
    div(phi,k)      $turbulence;
    div(phi,epsilon) $turbulence;
    div(phi,R)      $turbulence;
    div(R)          Gauss linear;

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

laplacianSchemes
{
    default         Gauss linear uncorrected;
}

interpolationSchemes
{
    default         linear;
}

snGradSchemes
{
    default         uncorrected;
}

設定確認 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          PBiCGStab;
        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
{
    equations
    {
        "(U|T|k|epsilon|R)" 1;
        "(U|T|k|epsilon|R)Final" 1;
    }
}

設定確認 setFieldsDict

defaultFieldValues
(
    volScalarFieldValue T 300
);

regions
(
    boxToFace
    {
        box (4.5 -1000 4.5) (5.5 1e-5 5.5);

        fieldValues
        (
            volScalarFieldValue T 600
        );
    }
);

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