Difference between phi and phiv

yhy20081016 · May 24, 2014, 11:56

Hi, everybody.
Usually, for many solvers, in "createFields.H", the face-flux is created by including the header file "createPhi.H". For compressible flows, the header "compressibleCreatePhi.H" is used instead. However, I observed that in the solver "cavitatingFoam", a third header named "createPhiv.H" is used. I cannot understand the difference between "phi" and "phiv". Does anyone has an idea? Thank you very much.

kettnera · August 21, 2014, 10:20

Quote:

Originally Posted by yhy20081016

Hi, everybody.
Usually, for many solvers, in "createFields.H", the face-flux is created by including the header file "createPhi.H". For compressible flows, the header "compressibleCreatePhi.H" is used instead. However, I observed that in the solver "cavitatingFoam", a third header named "createPhiv.H" is used. I cannot understand the difference between "phi" and "phiv". Does anyone has an idea? Thank you very much.

Reviewing both createPhi.H and createPhiv.H the files appear to be identical other than using phiv rather than phi.

mturcios777 · August 21, 2014, 13:46

Not knowing much about cavitatingFoam but quickly reviewing the solver, it appears phiv is the flux for the vapour fractin. This makes sense as you have a two phase flow you are solving for and each phase will have a different flux.

kettnera · August 21, 2014, 13:52

So the phiv and phi are identical but intended for different phases. I have not done multiphase work and the answer may be obvious if I had, but how does the code distinquish between the phases. Like I said earlier the code is identical. I will take a look at cavitatingFoam to see I can figure it out.

May 24, 2014, 11:56	Difference between phi and phiv	#1
yhy20081016 Member yehanyu Join Date: Mar 2012 Location: Beijing, China Posts: 48 Rep Power: 14	Hi, everybody. Usually, for many solvers, in "createFields.H", the face-flux is created by including the header file "createPhi.H". For compressible flows, the header "compressibleCreatePhi.H" is used instead. However, I observed that in the solver "cavitatingFoam", a third header named "createPhiv.H" is used. I cannot understand the difference between "phi" and "phiv". Does anyone has an idea? Thank you very much.

August 21, 2014, 13:46		#3
mturcios777 Senior Member Marco A. Turcios Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 740 Rep Power: 28	Not knowing much about cavitatingFoam but quickly reviewing the solver, it appears phiv is the flux for the vapour fractin. This makes sense as you have a two phase flow you are solving for and each phase will have a different flux. lpz456 likes this.

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August 21, 2014, 13:52		#4
kettnera New Member Andrew Kettner Join Date: May 2012 Posts: 4 Rep Power: 14	So the phiv and phi are identical but intended for different phases. I have not done multiphase work and the answer may be obvious if I had, but how does the code distinquish between the phases. Like I said earlier the code is identical. I will take a look at cavitatingFoam to see I can figure it out.