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Old   November 22, 2008, 16:14
Default Two fluids
  #1
Armen A. Ghirghidov
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Does anyone know how can I model two fluids in FLOW-3D. Am I need two mesh blocks for them. Unfortunately I did not find anything in User Manual unusefull.

Regards, Armen
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Old   November 24, 2008, 13:21
Default Re: Two fluids
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HC
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No, you don't have to have two mesh blocks for them. In two fluids model, fluid #1 has the fluid fraction of 1, and fluid #2 has 0. The fluid fraction between 0 and 1 means the mixture of two fluids. When you create initial fluid regions, just make sure the fluid fraction for each region is assigned with the correct value. The same applies to the boundary conditions.
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Old   November 25, 2008, 07:12
Default Re: Two fluids
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Armen A. Ghirghidov
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In this case when I need to include surface tension I do not know which one surface tension is on - water or oil, for example.
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Old   November 27, 2008, 01:05
Default Re: Two fluids
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michael barkhudarov
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Armen,

Surface tension is not a property of a fluid, rather of the interface between two media. So when you turn it on in oil-water case, it applies to the interface between oil and water.
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Old   November 27, 2008, 06:57
Default Re: Two fluids
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Armen A. Ghirghidov
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Thanks a lot.
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