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Old   May 26, 2003, 21:30
Default Another question on Free Surface
  #1
Miko
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Now I have another question. For free surface flow in vacuum, how can I simulate it?
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Old   May 27, 2003, 16:42
Default Re: Another question on Free Surface
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Robin
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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
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Old   May 27, 2003, 21:13
Default Re: Another question on Free Surface
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Miko
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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?
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Old   May 28, 2003, 09:53
Default Re: Another question on Free Surface
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Robin
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Yes, but if the density of your gas is too low, you may experience convergence problems.

Robin
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Old   May 28, 2003, 20:31
Default Re: Another question on Free Surface
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Miko
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Hi Robin,

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

Best regards!

Miko
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Old   May 30, 2003, 05:06
Default Re: Another question on Free Surface
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Peter Bartsch
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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0.1 otherwise the continuum assumption inherent to CFD codes is no longer valid.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
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