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Old   January 31, 2010, 02:00
Post two fluid
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JunWei Wang
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Hi, everyone!

I have a question about Flow 3D.

If i want to design a model for two fluids, A and B.

The initial condition is that A fluid is all in the tank.

The inflow is B, and how to do to set Q and H.

thanks your help.
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Old   February 1, 2010, 00:40
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michael barkhudarov
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Is Q the flow rate? What is H?
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Old   February 1, 2010, 05:27
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Q is flow rate.

H is fluid height.
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Old   February 1, 2010, 10:19
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michael barkhudarov
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fluid A is below H and fluid B above? Is Q the flow rate of fluid B? no fluid A is entering at the boundary, right?
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Old   February 1, 2010, 11:15
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the A fluid and B fluid are the same height.

the A fluid is like a reservoir.

the B fluid is like sediment flow. And the boundary is B's flow rate.

No A fluid enter at the boundery.

thanks a lot.
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Old   February 1, 2010, 23:46
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michael barkhudarov
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Quote:
Originally Posted by great1427 View Post
the A fluid and B fluid are the same height.

the A fluid is like a reservoir.

the B fluid is like sediment flow. And the boundary is B's flow rate.

No A fluid enter at the boundery.

thanks a lot.
How can you have sediment fluid B flow without fluid A?

In any case, you can define both fluid height and flow rate at an x or y mesh boundary using the flow rate BC. If you are using the two-fluid model, then the fluid fraction at the boundary controls the A/B mixture: F=1 - fluid #1 (A), F=0 - fluid #2 (B). If you use the sediment scour mode instead, then you can define the sediment concentration at the boundary directly. In that case, sediment is not treated as fluid, but rather as a concentration of sediment in fluid #1.
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Old   February 3, 2010, 22:46
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JunWei Wang
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And i have a question.

how about to set the mass source?

If i want the B fluid that is salt flow,then i have to set the model that is fluid 2,right?

however, i don't kown how to set the Mass-moment sources and Mass sources.

if you can, give an example.

thanks a lot.
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