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Old   August 4, 2006, 09:38
Default information regarding void fraction.
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hi all, can anyone help me how to view void fractions for flow through a cavitation tunnel? and can the cfx mesh be refined manually?? regards, deep

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Old   May 20, 2011, 03:33
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M. A.
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Hi friends,
I'm simulating a tube with water flow.
The tube encounters boiling near the wall.
I intend to calculate 'void fraction versus enthalpy' along the channel.
Can you help me how to calculate void fraction?

I'm in an emergency condition.
Waiting for your comments!!!

Thanks Everybody
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Old   May 20, 2011, 06:11
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Glenn Horrocks
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That sounds like the volume fraction of the vapour. This is a normal variable accessible in the post processor.
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Old   May 20, 2011, 06:46
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Thanks ghorrock for your comment.

So you mean there is no difference between 'void fraction' and 'volume fraction'?

Yes I have seen volume fraction in the post processor, but I didn't know they are the same.

Again thanks a lot for your guide.

All the best
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Old   May 21, 2011, 07:58
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I do not know how you are defining void fraction - but you would think void fraction is the same as gas volume fraction.
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Old   May 21, 2011, 12:18
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Hi ghorrocks,
Yes you're right. I mean what you said.
I've worked in single phase for more than 1 year.
But I'm beginner in multiphase flow.
Can you help me how to define multiphase in CFX-Pre?
Thanks
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