CFD Online Discussion Forums - The problem with my pimpleFoam residuals

Hi everyone,
I am just simulating a planar poiseuille problem but with non-Newtonian Herschel Bulkley fluid. The problem I'm solving is showing reasonable velocity profile and pressure drop, but when monitoring initial residuals, shows me some weird behaviour. I wanna know what the issue with my case in terms of residuals. I should mention that I'm using fvOption to have a periodic domain.

Code:

solvers

{

    p

    {

        solver          GAMG;

        tolerance       0;

        relTol          0.1;

        smoother        GaussSeidel;

    }



    pFinal

    {

        $p;

        smoother        DICGaussSeidel;

        tolerance       1e-06;

        relTol          0;

    }



    "(U|k|nuTilda)"

    {

        solver          smoothSolver;

        smoother        symGaussSeidel;

        tolerance       1e-05;

        relTol          0.1;

    }



    "(U|k|nuTilda)Final"

    {

        $U;

        tolerance       1e-05;

        relTol          0;

    }

}



PIMPLE

{

    nOuterCorrectors 15;

    nCorrectors     2;

    nNonOrthogonalCorrectors 0;

    pRefCell        1001;

    pRefValue       0;

    turbOnFinalIterOnly no;

}



relaxationFactors

{

    equations

    {

        ".*"   0.2;

    }

}