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RMS P-vol . what does it refer to?

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Old   August 21, 2013, 12:11
Default RMS P-vol . what does it refer to?
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hi all
i don't know what does P-vol in RMS equation refer to?
i know it is about continuity equation but what is the exact meaning?
i also know it changes into RMS mass by changing the boundary conditions
would you pleas help me figure it out?
best regards
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Old   August 21, 2013, 18:38
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This is all explained in the CFX theory manual.

But I do not understand your question "I also know it changes into RMS mass by changing the boundary conditions". That does not make sense to me.
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Old   August 22, 2013, 01:14
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i mean it is sometimes P-vol and sometimes P-mass.
i have the theory guide but i don't know where to look for it.i searched for P-vol equation but i didn't find anything.
by the way thanks for your quick reply glenn.
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Old   August 22, 2013, 10:02
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It's P-vol when you are solving multiphase problems, P-mass otherwise.

On multiphase problems the continuity equation is re-written as a volume conservation equation, therefore P-vol (P is because it is used to return the Pressure - the manual has this covered). Additional conservation equations are solved for each phase, giving you the volume fraction.
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Old   August 22, 2013, 10:46
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when you use segreted solution it is p-vol and when you are using coupled solutin it is p-mass in multiphase flows
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Old   August 23, 2013, 02:14
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Quote:
Originally Posted by brunoc View Post
It's P-vol when you are solving multiphase problems, P-mass otherwise.

On multiphase problems the continuity equation is re-written as a volume conservation equation, therefore P-vol (P is because it is used to return the Pressure - the manual has this covered). Additional conservation equations are solved for each phase, giving you the volume fraction.
tnx brunoc. i get your point
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