# Mass Diffusion Problem : How to?

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 October 26, 2008, 12:23 Mass Diffusion Problem : How to? #1 Rahul Guest   Posts: n/a Hi all, I want to simulate mass diffusion in a porous media. I was able to do a fluid flow simulation but could not figure out how to model a diffusion problem (for example diffusion of dye in water). I am interested in plotting concentration vs. time at the outlet until influent concentration level is reached. Please guide me through this problem. I have beginner level skills st CFX, so any help would be very helpful. Thanks, Rahul P.S Here's the link to the geometry I'm working with. http://www.flickr.com/photos/3178316...40591/sizes/o/

 October 26, 2008, 22:10 Re: Mass Diffusion Problem : How to? #2 frank Guest   Posts: n/a I think you can consider use additional variable to deal with this problem. just use poission equation or diffusive transport equation. good luck to you.

 October 27, 2008, 12:42 Re: Mass Diffusion Problem : How to? #3 Rahul Guest   Posts: n/a Thanks Frank. I have never used additional variables, but I'll work on it. Rahul

 October 27, 2008, 15:15 Re: Mass Diffusion Problem : How to? #4 Joao Guest   Posts: n/a See tutorial 4 on CFX help, it will help you.

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