大涡模拟壁湍流雷诺剪切应力
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@东岳 老师，目前在试算，所以我用的是一套二维网格，亚格子模型为WALE
simulationType LES; LES { LESModel WALE; 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; } }您说的van driest damping是vanDriestCoeffs里的设置吗？
上面的图是平均速度，实验数据为黑线，下方的正弦曲线是底部边界；5-30s我开始认为湍流没有完全发展，所以一直算到200s，又对100-200s取时均，定性上看，两个时间段的平均速度变化差不多；
雷诺应力的图被我删掉了，有关于湍动能的结果，实验数据为黑线，这个就完全不一致，而且不同时间段的湍动能时均值也不一致；
以下是我的设置：FoamFile { version 2.0; format ascii; class volScalarField; object nut; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 2 -1 0 0 0 0]; internalField uniform 0; boundaryField { INLET { type cyclicAMI; } OUTLET { type cyclicAMI; } BOTTOMWALL { type nutUSpaldingWallFunction; value uniform 0; } ATMOSPHERE { type nutUSpaldingWallFunction; value uniform 0; } frontAndBackPlanes { type empty; } }FoamFile { version 2.0; format ascii; class volScalarField; object p; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 2 -2 0 0 0 0]; internalField uniform 0; boundaryField { INLET { type cyclicAMI; } OUTLET { type cyclicAMI; } BOTTOMWALL { type zeroGradient; } ATMOSPHERE { type zeroGradient; //p0 uniform 0; } frontAndBackPlanes { type empty; } }FoamFile { version 2.0; format ascii; class volVectorField; object U; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // dimensions [0 1 -1 0 0 0 0]; internalField uniform (0 0 0); boundaryField { INLET { type cyclicAMI; } OUTLET { type cyclicAMI; } ATMOSPHERE { type noSlip; //value uniform (0 0 0); } BOTTOMWALL { type noSlip; } frontAndBackPlanes { type empty; } }FoamFile { version 2.0; format ascii; class dictionary; location "constant"; object fvOptions; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // momentumSource { type meanVelocityForce; selectionMode all; fields (U); Ubar (0.08 0 0); }FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSchemes; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default Euler; } gradSchemes { default Gauss linear; } divSchemes { default none; div(phi,U) bounded Gauss linearUpwind grad(U); div(phi,k) bounded Gauss limitedLinear 1; div(phi,epsilon) bounded Gauss limitedLinear 1; div(phi,omega) bounded Gauss limitedLinear 1; div(phi,v2) bounded Gauss limitedLinear 1; div((nuEff*dev2(T(grad(U))))) Gauss linear; div(nonlinearStress) Gauss linear; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } wallDist { method meshWave; }FoamFile { version 2.0; format ascii; class dictionary; location "system"; object fvSolution; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // solvers { p { solver PCG; preconditioner DIC; tolerance 1e-06 relTol 0.05; } pFinal { $p; relTol 0; }; "(U|k|B|nuTilda)" { solver smoothSolver; smoother GaussSeidel; tolerance 1e-05; relTol 0; } } PISO { nCorrectors 2; nNonOrthogonalCorrectors 0; pRefCell 0; pRefValue 0; }希望得到老师的回复，谢谢。
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@ewz 把你的divSchemes里面的bounded去掉，然后时间精度换backward试试。还有就是nut的边界条件nutUSpaldingWallFunction，这个可以换别的试试，具体哪个更好也说不清。
另外，你模拟的是什么？挺有意思的，要发SCI么，可以考虑下 http://www.cfd-china.com/topic/1716/cfd验证算例支持计划
黑线是实验数据，红线是什么？
vanDriest这样用：
simulationType LES; LES { LESModel WALE; turbulence on; printCoeffs on; delta vanDriest;// 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; } } -
C coolhhh 被引用 于这个主题
