cfx diffusion to porous media

bitak · November 9, 2012, 04:53

hello.
I want to simulate flow in tube that a porous media has been covered it ( exactly like blood arterial : blood + tissue).
how I can to simulate a normal diffusion from fluid flow to porous media in CFX ????
I described two domain and one interface.

ghorrocks · November 9, 2012, 05:55

If the diffusion can be modelled by a diffusion or diffusion+convection equation then try an additional variable. You can put the AV in the fluid and let it diffuse through the surrounding solids.

Or do you want the fluid to diffuse through the solid?

bitak · November 9, 2012, 16:08

Thanks for your answer. but I don't know what is different between define AV and diffuse fluid to suronding solid that you asked me
?

ghorrocks · November 9, 2012, 16:18

Have a look at the tutorials. A few of them use AVs. AVs can diffuse, convect or be defined as an algebraic equation. They do not have momentum like a fluid does. Temperature is a type of AV.

November 9, 2012, 04:53	cfx diffusion to porous media	#1
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 17	hello. I want to simulate flow in tube that a porous media has been covered it ( exactly like blood arterial : blood + tissue). how I can to simulate a normal diffusion from fluid flow to porous media in CFX ???? I described two domain and one interface.

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November 9, 2012, 05:55		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	If the diffusion can be modelled by a diffusion or diffusion+convection equation then try an additional variable. You can put the AV in the fluid and let it diffuse through the surrounding solids. Or do you want the fluid to diffuse through the solid?

November 9, 2012, 16:08		#3
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 17	Thanks for your answer. but I don't know what is different between define AV and diffuse fluid to suronding solid that you asked me ?

November 9, 2012, 16:18		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	Have a look at the tutorials. A few of them use AVs. AVs can diffuse, convect or be defined as an algebraic equation. They do not have momentum like a fluid does. Temperature is a type of AV.