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Sudden increase of turbulent kinetic energy "k"

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Old   December 8, 2016, 14:02
Default Sudden increase of turbulent kinetic energy "k"
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kasra karimi
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Dear foamers:

I am using OlaFoam (which is based on interFoam) to modeling a 3-D wave flume. the turbulent model is k-omega SST and the flume size is 12*2.2*1

the problem is that it works perfectly in 2D model, but when it comes to 3D, after 5-6 wave period "k" would increase suddenly from order of "0-1" to "3000" in one cell at the outlet boundary. I have put some snapshots of surface elevation and "k" together in the below picture + my mesh.




this increment would cause decreasing "deltaT" and the simulation won't progress. I would be really thankful if anyone could help me on this

*as you may ask about the boundary condition I have put it here:
for "k"
Code:
internalField   uniform 1.35e-5;

boundaryField
{

    outlet
    {
        type            zeroGradient;

    }
for "U"
Code:
internalField   uniform (0 0 0);
outlet
    {
        type            waveAbsorption2DVelocity;
        value           uniform (0 0 0);
    }
for "Omega"
Code:
internalField   uniform 136;

boundaryField
{
    outlet
    {
        type            zeroGradient;
    }
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