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multiphase volume fraction defintion

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Old   November 9, 2010, 10:24
Default multiphase volume fraction defintion
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Daniel Baeriswyl
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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
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Old   November 9, 2010, 16:40
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Glenn Horrocks
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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.
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Old   November 18, 2010, 12:01
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Willian
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Quote:
Originally Posted by ghorrocks View Post
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
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Old   September 2, 2011, 05:01
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Vishal
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Specify the working fluids as Water and air. That may solve your problem.
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