Anisotropic porosity

FrankW · August 2, 2011, 10:54

Hi,

i try to simulate a flow thru a porous foil. The foil has a anisotropic porosity (a lot of cylindrical pipes). In Fig 1 can you see the fluid domain (yellow) and the foil (red) and another porous domain (blue). Figure 2 shows velocity vectors on the domain interface. In this case i've used the isotropic porosity. How can i define that the velocity vectors are perpendicular to the surface?

best regards
frank

ghorrocks · August 2, 2011, 19:35

You could define an anisotropic porosity which stops tangential flow but allows normal flow.

FrankW · August 3, 2011, 03:55

Yes, of course! It was my first idea, but i don't know how. I've a free form surface and i should define the streamline direction in x y and z. There is no possibility to set this normal to surface.

ghorrocks · August 3, 2011, 06:36

You could use 3 separate 3D interpolation functions, one for each component.

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August 2, 2011, 19:35		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You could define an anisotropic porosity which stops tangential flow but allows normal flow.

August 3, 2011, 03:55		#3
FrankW Member Frank Weise Join Date: Mar 2009 Location: Germany Posts: 55 Rep Power: 17	Yes, of course! It was my first idea, but i don't know how. I've a free form surface and i should define the streamline direction in x y and z. There is no possibility to set this normal to surface.

August 3, 2011, 06:36		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	You could use 3 separate 3D interpolation functions, one for each component.