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-   -   about CFX 5.7 post for volume fraction (https://www.cfd-online.com/Forums/cfx/20752-about-cfx-5-7-post-volume-fraction.html)

 tec October 26, 2004 04:40

about CFX 5.7 post for volume fraction

Dear Sir:

I simulate the multi-species fluid flow and obtain many kinds of species based on mass fraction. I need the volume fraction of species, but don't know how to do? Could you point out what I should do in CFX-post?

The other question is that I want to evaulate the volume flow rate through the outlet for different species? What should I do in the CFX-post ?

Thanks for your attention.

 Neale November 1, 2004 23:49

Re: about CFX 5.7 post for volume fraction

y_i = x kg i / kg fluid r_i = x m^3 i / m^3 fluid

so:

r_i = x kg_i / kg_fluid * rho kg_fluid/m^3 fluid * 1/rho_i m^3 i / kg_i

or

volume fraction = mass fraction * fluid density / component density.

Just make a new variable in CFX-Post.

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