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-   -   Different Boundry Condition Type at the same face (http://www.cfd-online.com/Forums/fluent/67009-different-boundry-condition-type-same-face.html)

cupidvenus July 30, 2009 23:03

Different Boundry Condition Type at the same face
 
Hi, everybody.
I met a problem. Two kind of fluid A and B mix together. And the mixing fluid flow in a rectangle pipe. Three side of the pipe is setup as wall boundry condition. The other side of the pipe is a special boundry condition. Fluid A can pass through this side and fluid B can not. It means this side is pressure-out or massflow-out boundry condition for fluid A, and is wall boundry condition for fluid B. How can I setup it?

cupidvenus August 28, 2009 05:39

I really need your help!

ageorg August 28, 2009 06:17

outflow
 
i am not very sure but i think that if you use an outflow bc and you are using say the mixture or the eulerian multiphase model than you can specify outflow rates for phase separatelly. Hence, you can set the rate for phase a equal to 1 and the corresponding rate of phase B equal to 0.

mohsen zendehbad August 29, 2009 01:06

you'd better use the DEFINE_PROFILE udf, try to find this topic in udf help of the fluent(use the index). there you can define the BC for different phases differently(there you can access different phases by using different domain numbers,by looping over the faces in different domains you can impose what you want), but it needs some time to get the capablity of working with udf.

cupidvenus September 2, 2009 21:11

ageorg and mohsen zendehbad, thank you very much, I will try both method.

cupidvenus September 10, 2009 05:16

Quote:

Originally Posted by ageorg (Post 227789)
i am not very sure but i think that if you use an outflow bc and you are using say the mixture or the eulerian multiphase model than you can specify outflow rates for phase separatelly. Hence, you can set the rate for phase a equal to 1 and the corresponding rate of phase B equal to 0.

ageorg, I'v tried your method, Fluent do not allow one set flow rate weighting of fluid A or B. Only flow rate weighting of mixture is allowed.


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