Help,I have some questions about UDF of mass diffusivity in fluent -- CFD Online Discussion Forums

March 20, 2011, 12:40	Help,I have some questions about UDF of mass diffusivity in fluent	#1
apolloking New Member wangke Join Date: Mar 2011 Posts: 1 Rep Power: 0	Hi,all. I have some questions about UDF of mass diffusivity in fluent 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 can i define this in UDF. Thank you! Last edited by apolloking; March 20, 2011 at 13:13.

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