Reflective walls

acoustica · July 24, 2011, 17:34

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

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

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

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.

July 24, 2011, 17:34	Reflective walls	#1
acoustica New Member Tijery Join Date: Jan 2011 Posts: 25 Rep Power: 15	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 .!!!!

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July 24, 2011, 19:12		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	What reflects at the walls? Are you doing a radiation simulation?

July 25, 2011, 08:07		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	I see. Walls reflect pressure waves just fine with the normal no slip boundary condition. No need to do anything special.

July 25, 2011, 08:18		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	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.

July 25, 2011, 08:38		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,692 Rep Power: 143	Viewing the pressure field should do it.