# model for porous material

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 October 13, 2004, 13:38 model for porous material #1 sleepinglily Guest   Posts: n/a I am new to CFX and I want to model air flow thru porous material, I do not know how to do it, can somebody provide me an example to handle the porous material? I saw some old post mentioned about the CFX community has an example, but I do not have a login name for that. many many thanks!

 October 14, 2004, 23:07 Re: model for porous material #2 Anurag Guest   Posts: n/a we need to have a subdomain to define porous media. this subdomain is the 3D region which is supposed to be a porous media. properties of porous media is defined as momentum source. Different options are available (permeability, linear and quadratic resistance coefficients). in CFX 5.7 you can also specify anisotropic resistance in specific direction. contact CCFX tech support for user ID & password.

 October 14, 2004, 23:57 Re: model for porous material #3 sleepinglily Guest   Posts: n/a Thank you very much for you reply. I do not have CFX yet, I need to know CFX can do the model of air flow thru Carbon foam heatsink before I talked to my boss to let him buy it. so I cannot have userid & password to that tutorial. Can I send you emails to you to ask questions?

 October 19, 2004, 10:45 Re: model for porous material #4 Amir Guest   Posts: n/a Hi All, I have gone through the porous medium abilities of CFX but I still have problem in defining C1 and C2 as explained in http://www-waterloo.ansys.com/cfxcom...a_in_cfx-5.htm I can't figure out why it's mentioned that we should devide the resistance coefficients by porosity. The Darsy equation is developed based on superficial velocity and as they claim, CFX use superficial velocities for porous medium too during the run so why we should devide C1 and C2 by porosity? thanks for the help Amir

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