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-   -   multiphase volume fraction defintion (http://www.cfd-online.com/Forums/cfx/81868-multiphase-volume-fraction-defintion.html)

daniebae November 9, 2010 11:24

multiphase volume fraction defintion
 
Dear all,

i am doing a transient simulation. A solid is pressing in a fluid. the Fluid contains water and air. How can i define in CFX which part of the domain contains water or air ? there is no outlet and inlet.


thanks for an answer.

daniel

ghorrocks November 9, 2010 17:40

The CFX tutorials show the various ways water and air can be specified. The 2D flow over a bump one shows the free surface approach, the bubble column one shows the eularian approach.

100tinela November 18, 2010 13:01

Quote:

Originally Posted by ghorrocks (Post 282807)
The CFX tutorials show the various ways water and air can be specified. The 2D flow over a bump one shows the free surface approach, the bubble column one shows the eularian approach.

Like ghorrocks said, the tutorial "Flow over a bump" show how you can define it. You basically define these fluids in your domain settings and create a expression using step function to define two different volume fractions.

You also can find more information in CFX manual looking for "free surface".

Good luck,
Willian

vishal.indomitable September 2, 2011 05:01

Specify the working fluids as Water and air. That may solve your problem.


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