求助:rhoSimpleFoam求解残差很高的问题
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这是一个关于pressureDirectedInletVelocity 这个入口边界条件的一个问题,具体如下:
如图所示,计算所用的我现在用一个长方形的几何,单纯测试进口,里面没有任何几何。现在准备用规定速度方向的边界条件产生一个亚声速的入口条件,求解器用rhoSimpleFoam。
从模拟的结果数据而言,计算产生的流场是非常均匀,压力项随时间基本不变,都是1e5这个值,其余参数和预期符合也是比较好的,但是残差却非常高。我尝试着修改求解器的压力项和出口条件,但是结果并没有发生明显的变化。
这里给出我的求解残差图
现在怀疑是差分和求解控制那一块有问题,但是我试了很多次都没有找到问题的所在,所以请求路过的大神帮忙看一下,提些建议。这里给出fvSchemes和fvSolution。整个计算设置的原文件也会在后面给出。FoamFile { version 2.0; format ascii; class dictionary; object fvSchemes; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // ddtSchemes { default steadyState; } gradSchemes { default Gauss linear; limited cellLimited Gauss linear 1; grad(U) $limited; grad(k) $limited; grad(omega) $limited; } divSchemes { default none; // div(phi,U) bounded Gauss linearUpwind limited; /*div(U) Gauss linear; div(tauMC) Gauss linear; div(phi,epsilon) bounded Gauss upwind; div(phi,k) bounded Gauss upwind; div(phi,omega) bounded Gauss upwind;*/ //div(U) Gauss linear; /* div(phi,U) bounded Gauss linearUpwind limited; turbulence bounded Gauss upwind; energy bounded Gauss linearUpwind limited; div(phi,k) $turbulence; div(phi,omega) $turbulence; div(phi,e) $energy; div(phi,K) $energy; div(phi,Ekp) $energy; div(phid,p) Gauss linearUpwind limited; div((phi|interpolate(rho)),p) bounded Gauss upwind; div(((rho*nuEff)*dev2(T(grad(U))))) Gauss linear;*/ /*efault none; div(phi,U) bounded Gauss limitedLinearV 1; div(phi,k) bounded Gauss limitedLinear 1; div(phi,epsilon) bounded Gauss limitedLinear 1; div(phi,R) bounded Gauss limitedLinear 1; div(R) Gauss linear; div(phi,nuTilda) bounded Gauss limitedLinear 1; div((nuEff*dev2(T(grad(U))))) Gauss linear;*/ default none; div(phi,U) bounded Gauss linearUpwindV Gauss linear; div(phid,p) bounded Gauss linearUpwind Gauss linear; div(((rho*nuEff)*dev2(T(grad(U))))) Gauss linear; div(phi,e) bounded Gauss linearUpwind Gauss linear; div(phi,omega) bounded Gauss linearUpwind Gauss linear; div(phi,k) bounded Gauss linearUpwind Gauss linear; div(phi,Ekp) bounded Gauss linearUpwind Gauss linear; div(phiv,p) bounded Gauss linearUpwind Gauss linear; div(phi,K) bounded Gauss linearUpwind Gauss linear; } laplacianSchemes { default Gauss linear corrected; } interpolationSchemes { default linear; } snGradSchemes { default corrected; } wallDist { method meshWave; } // ************************************************************************* //
FoamFile { version 2.0; format ascii; class dictionary; object fvSolution; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // solvers { p { solver GAMG; smoother GaussSeidel; tolerance 1e-6; relTol 0.01; } "(U|k|omega|e)" { solver PBiCGStab; preconditioner DILU; tolerance 1e-6; relTol 0.1; } } SIMPLE { residualControl { p 1e-6; U 1e-6; "(k|omega|e)" 1e-6; } nNonOrthogonalCorrectors 0; pMinFactor 0.1; pMaxFactor 2; } /* potentialFlow { nCorrectors 10; }*/ relaxationFactors { fields { p 0.7; rho 0.01; } equations { U 0.3; e 0.7; "(k|omega)" 0.7; } } // ************************************************************************* //
原文件如下:toCFDCHINA.zip