# two fluid

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 January 31, 2010, 02:00 two fluid #1 New Member   JunWei Wang Join Date: Jan 2010 Posts: 13 Rep Power: 7 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.

 February 1, 2010, 00:40 #2 Senior Member   michael barkhudarov Join Date: Mar 2009 Posts: 331 Rep Power: 9 Is Q the flow rate? What is H?

 February 1, 2010, 05:27 #3 New Member   JunWei Wang Join Date: Jan 2010 Posts: 13 Rep Power: 7 Q is flow rate. H is fluid height.

 February 1, 2010, 10:19 #4 Senior Member   michael barkhudarov Join Date: Mar 2009 Posts: 331 Rep Power: 9 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?

 February 1, 2010, 11:15 #5 New Member   JunWei Wang Join Date: Jan 2010 Posts: 13 Rep Power: 7 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.

February 1, 2010, 23:46
#6
Senior Member

michael barkhudarov
Join Date: Mar 2009
Posts: 331
Rep Power: 9
Quote:
 Originally Posted by great1427 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.

 February 3, 2010, 22:46 #7 New Member   JunWei Wang Join Date: Jan 2010 Posts: 13 Rep Power: 7 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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