How does CFX and/or CFD-post convert from mass fraction to molar concentration? -- CFD Online Discussion Forums

April 23, 2020, 20:25	How does CFX and/or CFD-post convert from mass fraction to molar concentration?	#1
lordluan Member Lucas Join Date: May 2019 Posts: 41 Rep Power: 7	Hi There, I am doing a simulation with gases. In the boundary IN, CFX requires the mass fraction which I added. Looking the results in CFD-post, I see the results as a plot of molar concentration x time (since its transient problem) of a point I placed in the Boundary IN. The values of Molar concentration calculated by the software are higher than the ones calculated using the ideal gas law. So I'd like to know how CFX converts the mass fraction value into molar concentration, since the boundary IN isn't affect by the phenomena I'm simulating. Last edited by lordluan; April 23, 2020 at 22:33. Reason: Make the text clearer

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