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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"
internalField   uniform 1.35e-5;


        type            zeroGradient;

for "U"
internalField   uniform (0 0 0);
        type            waveAbsorption2DVelocity;
        value           uniform (0 0 0);
for "Omega"
internalField   uniform 136;

        type            zeroGradient;
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interfoam, olafoam

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