计算一个简单二维多圆柱绕流的动网格算例，网格数量大概40-50万，fvsolution中的nOuterCorrectors和nCorrecters我尝试了不同的值，发现随着该值设置的越来越大，结果才会收敛，最终分别等于20和10。但是这个条件下，计算时间特别久，一个二维40-50万网格的算例要计算将近90个小时，感觉很不合理。想请教一下各位大佬，我是不是哪里设置出错了？

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2006                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

solvers
{
    "(p|pcorr)"
    {
        solver          PCG;
        preconditioner        DIC;
        tolerance       1e-04;
        relTol          0.1;
    }
    "(p|pcorr)Final"
    {
        $p;
        relTol          0;
    }
    U
    {
        solver          smoothSolver;
        smoother        symGaussSeidel;
        tolerance       1e-04;
        relTol          0.1;
    }
    UFinal
    {
        $U;
        tolerance       1e-04;
        relTol          0.0;
    }
}


PIMPLE
{
    momentumPredictor   no;
    correctPhi          yes;
    nOuterCorrectors    20;
    nCorrectors         10;
    nNonOrthogonalCorrectors 1;
    ddtCorr             true;

    pRefPoint           (20.0 0.0 0.5);
    pRefValue           0.0;
}

relaxationFactors
{
   fields
   {
   }
   equations
   {
       "U.*"             1;
   }
}
// ************************************************************************* //

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2006                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "system";
    object      fvSchemes;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

ddtSchemes
{
    default         Euler;
}

gradSchemes
{
    default         Gauss linear;
}

divSchemes
{
    default         none;
    div(U)          Gauss linear;
    div(phi,U)      Gauss linearUpwind grad(U);
    div(phi,k)      Gauss linearUpwind grad(U);
    div(phi,K)      Gauss linearUpwind grad(U);
    div(phi,omega)  Gauss linearUpwind grad(U);
    div((nuEff*dev2(T(grad(U))))) Gauss linear;
}

laplacianSchemes
{
    default         Gauss linear corrected;
}

interpolationSchemes
{
    default         linear;
}

snGradSchemes
{
    default         corrected;
}

wallDist
{
    method meshWave;
}


// ************************************************************************* //

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