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Mass concentration (custom field function)

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Old   December 12, 2011, 11:50
Default Mass concentration (custom field function)
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I want to plot contours of SO2 concentration in kg/m^3.

Can someone help me with custom field function for that?

I was thinking of C (as concentration):

C = m_i / V

m_i - mass fraction
V - volume

But fluent don't offer me these when I am writing my custom field function.
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