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 acoustica July 24, 2011 17:34

Reflective walls

I am doing real time wind tunnel numerical simulation in CFX. I want to set reflective walls for wind tunnels walls.Does any body knows how to set the reflective wall boundary conditions in CFX. the reflective conditions are applicable only for open type boundary conditions in CFX and not for wall type.
please tell if any solution .!!!!

 ghorrocks July 24, 2011 19:12

What reflects at the walls? Are you doing a radiation simulation?

 acoustica July 25, 2011 05:15

Quote:
 Originally Posted by ghorrocks (Post 317310) What reflects at the walls? Are you doing a radiation simulation?
No am not doing radiation simulation ..but simple pressure wave reflection ..

 ghorrocks July 25, 2011 08:07

I see. Walls reflect pressure waves just fine with the normal no slip boundary condition. No need to do anything special.

 acoustica July 25, 2011 08:10

Quote:
 Originally Posted by ghorrocks (Post 317368) I see. Walls reflect pressure waves just fine with the normal no slip boundary condition. No need to do anything special.
u mean to say no slip boundary conditions are reflective by definition .

 ghorrocks July 25, 2011 08:18

That is right.

In fact slip walls are reflective too. The reflection of pressure waves comes about from the zero normal velocity at the wall. Anything which stops (or even just impedes) flow normal to it will reflect pressure waves.

 acoustica July 25, 2011 08:27

Quote:
 Originally Posted by ghorrocks (Post 317375) That is right. In fact slip walls are reflective too. The reflection of pressure waves comes about from the zero normal velocity at the wall. Anything which stops (or even just impedes) flow normal to it will reflect pressure waves.
Thanks for the clarification !
Until now i am using free slip boundary conditions.. but i don't know know how to check weather how to check weather the wave is reflected or not . is there any post processing procedure ...

 ghorrocks July 25, 2011 08:38

Viewing the pressure field should do it.

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