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January 4, 2024 at 2:26 pm
christian.scheffler
Subscriber

I tested air pressure/density at 20000m level -> no visible influence. 

Convergence is almost below 1e-4 RMS for all momentums. But I am not sure if RMS assessment is correct for such a large area where only a small number of cells contain the water jet.
Any ideas how to improve convergence for the steady state analysis? Timescale settings? Note: The distance of the jet in x is about 1m, that means a travel duration of about 0.25s for one fluid particle.

Convergence Momentums and Volume Fractions

I will test to increase jet size in order to minimize interface losses between the two fractions air/water and increase the cell number trying to improve convergence.

Reducing the drag coefficient from 0.44 to 0.0 seems to had the biggest impact.

Any other ideas are welcome.