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-   -   Mass transfer units in fluent (https://www.cfd-online.com/Forums/fluent/45371-mass-transfer-units-fluent.html)

nite_surfer July 12, 2007 12:51

Mass transfer units in fluent
 
Hi all, I hope someone can give me an advice in this topic.

In Fluent's UDF manual it is stated that the units that must be returned in a DEFINE_MASS_TRANSFER UDF are kg/m3.

Commonly mass transfer coefficients are in kg/m3-s so for non-steady simulations it is possible to multiply by the current time step and the units are fullfilled, but in steady state it is not possible.

I have been told that UDF manual is a misprint and that the returned units are always kg/m3-s, but my simulations in steady state gave me too high mass transfer values, while non-steady simulations with the units as asked in the manual, are correct.

Can anybody help me in this?

If it is not a problem with the manual how can I circumvent the units affair in steady state?

Thanks Nite



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