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Reply To: Gas-liquid turbulent flows with LBM


Dear Aurelio,

I just can guess, because I don’t know your simulation setup. If you want to simulate such a high Reynolds number, you should respect your grid spacing.
How do you estimate your grid spacing?
Do you have a wallbounded flow, if this is the fact what is your y+?
If you grid is to coarse you have to deal with a small tau, which could lead to instabilities.
Do you know where the instabilities occur? (at the boundaries, at the gas liquid Interface…)
You lattice velocitiy is too high, you should avoid lattice velocities higher than 0.1.

My suggestions:
-increase your grid size to get a stable simulation
-estimate your smallest scales and adapt your grid spacing again to get physical meaningful results

Best Marc