Another question on Free Surface
 

Now I have another question. For free surface flow in vacuum, how can I simulate it?

Re: Another question on Free Surface
 

Hi Miko,

This is not physically realistic. To have a liquid free surface, there must be some gas phase applying pressure.

If you like, you can specify your second phase to have a very small density, but I suspect you will have problems if it is too small.

Robin

Re: Another question on Free Surface
 

Hi Robin,

Yes, you are right. I think I should apply a certain gas around it. If the density of the gas is small but with certain value of pressure, is it possible?

Re: Another question on Free Surface
 

Yes, but if the density of your gas is too low, you may experience convergence problems.

Robin

Re: Another question on Free Surface
 

Hi Robin,

Oh, I see. OK, I will pay attention it. Thank you!

Best regards!

Miko

Re: Another question on Free Surface
 

I recommend that you calculate Knudsen number (mean free path / reactor dimension) for the gas side. It should be <0.1 otherwise the continuum assumption inherent to CFD codes is no longer valid.

Peter