a question about volume fraction

September 19, 2003, 10:22

hello,evryone I have a question about volume fraction in multiphase flow problem.I want to add a user scalar in cfx4.4. when I defined the source term P of the scalar in user fortran,which is correct, Su=Su+P or Su=Su+P/VF? VF is the volume fraction of corresponding phase.

September 20, 2003, 00:37

A scalar, such as a mass fraction, is added in as such. It will be added as mass/(mass of phase in cell). If you are adding a source which is on a volume basis, you will have to convert it using densities and volume fractions to get it to a mass basis.

Jeff

September 19, 2003, 10:22	a question about volume fraction	#1
bill Guest Posts: n/a	hello,evryone I have a question about volume fraction in multiphase flow problem.I want to add a user scalar in cfx4.4. when I defined the source term P of the scalar in user fortran,which is correct, Su=Su+P or Su=Su+P/VF? VF is the volume fraction of corresponding phase.

September 20, 2003, 00:37	Re: a question about volume fraction	#2
Jeff Guest Posts: n/a	A scalar, such as a mass fraction, is added in as such. It will be added as mass/(mass of phase in cell). If you are adding a source which is on a volume basis, you will have to convert it using densities and volume fractions to get it to a mass basis. Jeff

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