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-   -   Diffusion from fluid region into porous tissue. (http://www.cfd-online.com/Forums/fluent/45598-diffusion-fluid-region-into-porous-tissue.html)

Lindz August 3, 2007 08:34

Diffusion from fluid region into porous tissue.
 
Can any one help me please?

Im modelling oxygen diffusion from fluid into porous tissue. I want the fluid flow stationary and want to see the effects of the oxygen diffusing into the tissue until equilibrium is reached. When i use the exact boundary conditions needed and include an inlet velocity i get what i would expect for the flow field; so the porosity definitions should be correct. However, when i try to model the species transfer, the concentration of oxygen is the same within the tissue as outside the tissue to start with. Is there a way of specifying a lower concentration of oxygen for the tissue as it wouldn't let me modify oxygen content in the materials panel.

Also, for the diffusion into the tissue, would i need to write a UDF for the source term within the tissue as im new to all this stuff.

Many thanks Lindz


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