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Hi all,

I'm trying to model transport of an additional variable in a fluid domain within CFX. The diffusivity coefficient depends on the additional variable itself.

The following equations may help to understand the problem:

The transport equation for Ht (labelled as H):
111111.jpg

The diffusion coefficient:
111112.jpg

where the Ht is the local concentration. Thus it depends on itself.

As far as I have looked, I cannot seem to find a way around to implement this. I have tried adding the additional variable (H) in the equation in CEL expression however it comes with error in the solver.

Does anyone know how to overcome this in CFX Pre? If not is it possible to do in Fortran? I have no experience in using Fortran so any suggestions/ advice/ guide to approach it would be much appreciated! Have been stuck on this for couple of months and little bit frustrated

Many thanks!
Saj