Multiphase Flow - Homogeneous Model - CFX Solver

MissCFD · August 23, 2017, 17:03

Hi,

I don’t understand why I don’t see Mass Imbalance of Air in a multiphase flow simulation (water & air) in the CFX-Solver. I see only ’’RMS Mass (Water)’’ and ’’Mass Imbalance (Water)’’. For your information, I use the Homogeneous model. Somebody knows why ?

Thank you

MissCFD · August 23, 2017, 23:22

Here is a screenshot to better understand what I said

ghorrocks · August 24, 2017, 18:21

Have you looked in the documentation? That explains the equations it is solving when you turn on various physical models.

MissCFD · August 25, 2017, 13:44

Yes of course. With homogeneous model, it is mentioned that 3 momentum equations are solving (Um,Vm,Wm,P), two phasic continuity equation ( $r_{\alpha}$ , $r_{\beta}$ ) and one volume conservation equation.

Quote:

Originally Posted by ghorrocks

Have you looked in the documentation? That explains the equations it is solving when you turn on various physical models.

ghorrocks · August 25, 2017, 21:58

Close, but not quite. It is solving 3 momentum equations and continuity (UVWP), and a volume fraction equation.

The second volume fraction is simply 1-vf of the other phase, so no solution matrix is required for that one.

August 23, 2017, 17:03	Multiphase Flow - Homogeneous Model - CFX Solver	#1
MissCFD Senior Member Join Date: Aug 2014 Posts: 160 Rep Power: 11	Hi, I don’t understand why I don’t see Mass Imbalance of Air in a multiphase flow simulation (water & air) in the CFX-Solver. I see only ’’RMS Mass (Water)’’ and ’’Mass Imbalance (Water)’’. For your information, I use the Homogeneous model. Somebody knows why ? Thank you

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August 24, 2017, 18:21		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,729 Rep Power: 143	Have you looked in the documentation? That explains the equations it is solving when you turn on various physical models.

August 25, 2017, 21:58		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,729 Rep Power: 143	Close, but not quite. It is solving 3 momentum equations and continuity (UVWP), and a volume fraction equation. The second volume fraction is simply 1-vf of the other phase, so no solution matrix is required for that one.