[Beingzzz]

Hi all!

I´m doing a simulation with overset meshes. I ran already the tutorials that come with the version v2006.The simulation results are in line with expectations, but there are many numerical oscillations in lift and drag. I don't know what caused this, or overset itself will have such a result. Below are my results and fv settings, please give me some suggestions, thank you.
fvschemes

ddtSchemes
{
    default         Euler;
}

gradSchemes
{
    default         Gauss linear;
    grad(T)         Gauss linear;
}

divSchemes
{
    default         none;
    div(phi,U)      Gauss limitedLinearV 1;
    div(phi,k)      Gauss limitedLinear 1;
    div(phi,epsilon) Gauss limitedLinear 1;
    div(phi,R)      Gauss limitedLinear 1;
    div(R)          Gauss linear;
    div(phi,nuTilda) Gauss limitedLinear 1;
    div((nuEff*dev(T(grad(U))))) Gauss linear;
    div((nuEff*dev2(T(grad(U))))) Gauss linear;
}

laplacianSchemes
{
    default         Gauss linear corrected;
    laplacian(diffusivity,cellDisplacement)  Gauss linear corrected;
}

interpolationSchemes
{
    default         linear;
}

snGradSchemes
{
    default         corrected;
}

oversetInterpolation
{
    method              inverseDistance;
   

    //method              trackingInverseDistance;
    //searchBoxDivisions  2{(100 100 1)};
}

fluxRequired
{
    default         no;
    pcorr           ;
    p               ;
}

fvsolution

solvers
{
    cellDisplacement
    {
        solver          PCG;
        preconditioner  DIC;

        tolerance       1e-06;
        relTol          0;
        maxIter         100;
    }

    p
    {
        solver          PBiCGStab;
        preconditioner  DILU;
        tolerance       1e-6;
        relTol          0;
    }

    pFinal
    {
        $p;
    }

    pcorr
    {
        $p;
        solver          PCG;
        preconditioner  DIC;
    }

    pcorrFinal
    {
        $pcorr;
        relTol          0;
    }

    "(U|k|epsilon)"
    {
        solver          smoothSolver;
        smoother        symGaussSeidel;
        tolerance       1e-6;
        relTol          0;
    }

    "(U|k|epsilon)Final"
    {
        $U;
        tolerance       1e-6;
        relTol          0;
    }
}

PIMPLE
{
    momentumPredictor   no;
    correctPhi          no;
    nOuterCorrectors    1;
    nCorrectors         2;
    nNonOrthogonalCorrectors 0;

    ddtCorr             false;

    pRefPoint           (0.0001 0.0001 0.001);
    pRefValue           0.0;
}

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