CFD slot die results for kinematic viscosity of 0.2 (turbulence turned off)

in case/system/fvSolution

........

relaxationFactors
{
    equations
    {
        U               0.85; // 0.9 is more stable but 0.95 more convergent
        ".*"            0.85; // 0.9 is more stable but 0.95 more convergent
    }
}

potentialFlow
{
    nNonOrthogonalCorrectors 10;
}

........

The program crashes with the turbulence turned off

===================================================
 relaxationFactors
{
    equations
    {
        U               0.9; // 0.9 is more stable but 0.95 more convergent
        ".*"            0.9; // 0.9 is more stable but 0.95 more convergent
    }
}

===================================================

relaxationFactors
{
    equations
    {
        U               0.95; // 0.9 is more stable but 0.95 more convergent
        ".*"            0.95; // 0.9 is more stable but 0.95 more convergent
    }
}

===================================================

relaxationFactors
{
    equations
    {
        U               0.98; // 0.9 is more stable but 0.95 more convergent
        ".*"            0.98; // 0.9 is more stable but 0.95 more convergent
    }
}

Hmm...I wonder if I can run things longer for the higher relaxation factors.


====================================
fvSolution:::

relaxationFactors
{
    equations
    {
        U               0.98; // 0.9 is more stable but 0.95 more convergent
        ".*"            0.98; // 0.9 is more stable but 0.95 more convergent
    }
}

controlDict::

stopAt          endTime;

endTime         20;    //// this is double the previous 0.98 relaxation run

==================================================

fvSolution:::

relaxationFactors
{
    equations
    {
        U               0.98; // 0.9 is more stable but 0.95 more convergent
        ".*"            0.98; // 0.9 is more stable but 0.95 more convergent
    }
}

controlDict::

stopAt          endTime;

endTime         30;    //// this is double the previous 0.98 relaxation run

===================================================

/constant/turbulenceProperties/

simulationType RAS;

RAS
{
    // Tested with kEpsilon, realizableKE, kOmega, kOmegaSST, v2f,
    // ShihQuadraticKE, LienCubicKE.
    RASModel        kEpsilon;

    turbulence      on;

    printCoeffs     on;
}



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

with everything else (i.e. relaxationFactors, ControlDict) like the previous run!

ahhh.... crashing...

==================================================

fvSolution::

.......

SIMPLE
{
    nNonOrthogonalCorrectors 0;
    consistent      yes;

    residualControl
    {
        p               1e-1;
        U               1e-1;
        "(k|epsilon|omega|f|v2)" 1e-3;
    }
}

relaxationFactors
{
    equations
    {
        U               0.98; // 0.9 is more stable but 0.95 more convergent
        ".*"            0.98; // 0.9 is more stable but 0.95 more convergent
    }
}

............

controlDict::

startTime       0;

stopAt          endTime;

endTime         30;