# RMS P-vol . what does it refer to?

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 August 21, 2013, 12:11 RMS P-vol . what does it refer to? #1 Senior Member     hamed Join Date: Apr 2009 Posts: 148 Rep Power: 10 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

 August 21, 2013, 18:38 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 13,874 Rep Power: 107 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.

 August 22, 2013, 01:14 #3 Senior Member     hamed Join Date: Apr 2009 Posts: 148 Rep Power: 10 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.

 August 22, 2013, 10:02 #4 Senior Member   Bruno Join Date: Mar 2009 Location: Brazil Posts: 279 Rep Power: 14 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. hmasenger likes this.

 August 22, 2013, 10:46 hi #5 New Member   mohammad Join Date: May 2013 Posts: 10 Rep Power: 6 when you use segreted solution it is p-vol and when you are using coupled solutin it is p-mass in multiphase flows

August 23, 2013, 02:14
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hamed
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Quote:
 Originally Posted by brunoc 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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