How to define this in UDF? -- CFD Online Discussion Forums

September 30, 2024, 06:31	How to define this in UDF?	#1
glenhernan New Member Glen Hernan Join Date: Sep 2024 Posts: 1 Rep Power: 0	Hello, As I know, by default, FLUENT uses the dilute approximation, under which the diffusion ﬂux can be written as that means the mass diffusion coeffcient Di,m is a isotropic value, but in some papers, the mass diffusion coeffcient is an anisotropic value, the mass diffusion coeffcient in radial direction is different from that in axial direction. How to define this in UDF? Hope that someone can explain this. Thanks in advance!

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