[Ahmed Elhanafi]

Hi Everyone,

I'm using waves2foam to generate waves and current via the library "stokesFirstwCurrent". I could generate only waves and only current with very good agreement compared to wave theory and with minimal reflection from the outlet boundary even for a long time simulation. However, when I generate waves+current, the results look good for few cycles but I got reflection from the outlet boundary and an increase in water level even though I'm using an outlet relaxation zone of two wavelengths.

The second issue I'm facing is when running a simulation of waves+current (or only current with velocity 4 m/s) on a fixed cylinder. I'm using a time step 0.001 s; however, the solver crashes after 7 time steps with Max(alpha1) = 2e+24 !!!. I have increased nAlphaSubCycles to 10, but did not work. I think it is a stability issue. If I use adjustTimeStep "yes" with maxCo and maxAlphaCo = 0.25, the solution becomes more stable but very slow as deltaT automaticaly decreases to e-5 s.

Any suggestions on how to fix up these issues are highly appreciated.

Thanks in advance.
Kind regards,
Ahmed

[ngj]

Hi Ahmed,

You make reference to a wave theory, which is not distributed as standard with waves2Foam. This might explain, why people are not responding to your question.

For my part, I am unable to assist.

Kind regards

Niels