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Old   July 7, 2006, 10:27
Default mass diffusivity
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while running a FLUENT simulation i am getting the following message: warning check material properties : invalid (zero)diffusivity in each iteration. i use kinetic theory for mass diffusivity.

what would be the problem.

thanks in advance

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Old   July 10, 2006, 13:19
Default Re: mass diffusivity
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Hi Saghir,

I had that problem too. Read up on what kinetic theory actually does. Somehow the results of that are giving a result of zero for one of your materials. Try just guessing a value to see if the program runs that way...if it doesn't, then there's a different problem.

Cheers, Ryan
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Old   July 17, 2006, 07:01
Default Re: mass diffusivity
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Hello,Thanks for your help the program runs that way with a constant value of diffusivity . I use kinetic theory method because I do not know a formula to calculate the humid air-water diffusivity.
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