How to define a fluid-fluid domian interface as porous face

EvanGu · February 21, 2017, 04:21

I want to simulate a CRAC system in data center room with CFX, which supply cold air flow from under floor plenum to room through perforate tiles, so perforate tiles is between two fluid domain as a thin interface. but I do not know how to define the tile opening Percentage in a fluid-fluid domian interface. maybe my question is stupid, but I am a fresh user of CFX software, thanks for your help

evcelica · February 27, 2017, 16:29

You would define a loss model or pressure drop at the interface. It would not be by "open area" but rather pressure drop as a function of velocity.

EvanGu · February 28, 2017, 04:07

evcelica, thanks for your reply.
I have another question，can I define the flow direction at the interface? for instance, let the flow streamline perpendicular to the interface.

ghorrocks · February 28, 2017, 05:24

Then use a directional momentum source. Use the porous model in the flow direction and set the velocities in the cross directions to zero. If you do a search of the forum you will find examples of how to use a momentum source term to set the velocity to a specific value (which in this case would be zero).

EvanGu · March 2, 2017, 03:16

Your adivce is very useful,and really appreciated.

February 27, 2017, 16:29		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,188 Rep Power: 23	You would define a loss model or pressure drop at the interface. It would not be by "open area" but rather pressure drop as a function of velocity. EvanGu likes this.

February 28, 2017, 05:24		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	Then use a directional momentum source. Use the porous model in the flow direction and set the velocities in the cross directions to zero. If you do a search of the forum you will find examples of how to use a momentum source term to set the velocity to a specific value (which in this case would be zero). EvanGu and Coolish like this.

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February 28, 2017, 04:07		#3
EvanGu New Member Evan Join Date: Feb 2017 Posts: 4 Rep Power: 9	evcelica, thanks for your reply. I have another question，can I define the flow direction at the interface? for instance, let the flow streamline perpendicular to the interface.

March 2, 2017, 03:16		#5
EvanGu New Member Evan Join Date: Feb 2017 Posts: 4 Rep Power: 9	Your adivce is very useful,and really appreciated.