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Armen A. Ghirghidov November 22, 2008 15:14

Two fluids
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

HC November 24, 2008 12:21

Re: Two fluids
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.

Armen A. Ghirghidov November 25, 2008 06:12

Re: Two fluids
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.

michael barkhudarov November 27, 2008 00:05

Re: Two fluids

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.

Armen A. Ghirghidov November 27, 2008 05:57

Re: Two fluids
Thanks a lot.

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