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BC in multiphase flow

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Old   July 23, 2013, 03:08
Default BC in multiphase flow
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Ivan Telnov
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Hi everyone!

I am engaged in studing of sewage aeration (multiphase flow water/air, Eulerian - Eulerian approach).
Could you help me with BC?

How can I specify BC, where it will be like water surface (water - primary phase), but for air it will be outlet (or air will vanish there) ?
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Old   July 24, 2013, 04:22
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OJ
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What you are probably looking for is a degassing boundary condition that works as a mass sink for the air but a free slip wall for water.

CFX has an in-built degassing BC but FLUENT didn't untill version 14.5 (I guess). If you have FLUENT 14.5, look for this BC in your simulation.

Otherwise, you may have to write a UDF to achieve this.

OJ
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Old   July 24, 2013, 05:53
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Ivan Telnov
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thanks for the reply! I've really worked in Fluent 14.0 and that's why I've not seen BC that you mentioned.
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