how to specify a wall as porous wall in CFX

nagarjuna reddy · July 12, 2009, 01:48

hi all, i struck up with a small problem. i.e how to specify a wall as a porus wall in cfx. Can any one please help me in this regard.

ghorrocks · July 12, 2009, 07:55

Hi,

CFX supports porous regions. Look in the documentation for details.

But I am guessing this is not what you are looking for - do you mean you want to do wall boundary layer suction like in a wind tunnel? If you can describe what type of flow you are trying to model we might be of more assistance.

Glenn Horrocks

nagarjuna reddy · July 12, 2009, 09:41

thanks for your suggestion..Well, my problem is, i need to specify a wall as no slip wall and at the same time i want to inject a gas from it by placing a hole.i need to specify only normal component of velocity at the wall and tangential component as zero.which boundary condition i can use for this contest in CFX.
Can anyone please help me in this regard.

ghorrocks · June 3, 2010, 09:03

The thread got pointed to by another post...

The answer is to use a mass source on a wall boundary. This will allow for the creation of a prescribed mass flow rate of fluid but retains a no slip wall boundary.

July 12, 2009, 01:48	how to specify a wall as porous wall in CFX	#1
nagarjuna reddy New Member Nag Join Date: Jun 2009 Posts: 2 Rep Power: 0	hi all, i struck up with a small problem. i.e how to specify a wall as a porus wall in cfx. Can any one please help me in this regard.

July 12, 2009, 09:41		#3
nagarjuna reddy New Member Nag Join Date: Jun 2009 Posts: 2 Rep Power: 0	thanks for your suggestion..Well, my problem is, i need to specify a wall as no slip wall and at the same time i want to inject a gas from it by placing a hole.i need to specify only normal component of velocity at the wall and tangential component as zero.which boundary condition i can use for this contest in CFX. Can anyone please help me in this regard. Last edited by nagarjuna reddy; July 13, 2009 at 10:43.

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July 12, 2009, 07:55		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	Hi, CFX supports porous regions. Look in the documentation for details. But I am guessing this is not what you are looking for - do you mean you want to do wall boundary layer suction like in a wind tunnel? If you can describe what type of flow you are trying to model we might be of more assistance. Glenn Horrocks

June 3, 2010, 09:03		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	The thread got pointed to by another post... The answer is to use a mass source on a wall boundary. This will allow for the creation of a prescribed mass flow rate of fluid but retains a no slip wall boundary.