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a question about volume fraction

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Old   September 19, 2003, 09:22
Default a question about volume fraction
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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.
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Old   September 19, 2003, 23:37
Default Re: a question about volume fraction
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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.

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