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Old   January 22, 2013, 21:10
Default Mass diffusivity
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Ive succesfully compiled and used a customized mass diffusion udf for a binary mixture. However when i extend the udf to 7 species i get a warning message that tells me the mass diffusivity is zero. The funny thing is that the user defined memories show the correct value for the variables that are used to calculate the diffusivities. Also, the diffisivity for the first 2 species is also being calculated and displayed correctly when i initialize the case.

Any thoughts on how i could solve this issue?

Thanks in advance.
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Old   April 1, 2016, 01:15
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I'm sorry that I can't answer your question. Anyway you could share how you returned binary diffusion coefficients from your UDF? I can't seem to get my DEFINE_DIFFUSIVITY UDF to return anything but values for species i instead of species i in species j. Any help would be greatly appreciated.

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