[bmarkus]

Dear all,

I am trying to implement a multiphase flow of air and water. The water content is present as dispersed droplets. Number and diameter are given.

The flow that I am trying to model is basically the flow around an optical probe, which is cylindrical. The optical probe has to be protected against the water droplets. This protection is realized by implementing air jets at the probe.

So far I ran steady state and transient calculations without any droplets which worked out perfectly fine.

But once I apply the dispersed flow with a certain volume fraction of the water my simulations crashed because of an overflow caused by too high Mach numbers. I took a look at the results right before the overflow where I recognized that the high Mach numbers of the air are in the vicinity of the wall.

Does anyone have an idea what could cause this problem?


Thanks in advance!