Wind tunnel boundary conditions

Stef06 · December 7, 2010, 12:36

I am modeling a closed circuit wind tunnel in FLUENT. To simulate the fan, I have introduced a "cut" in the tunnel, assigning one of these edges as velocity inlet and the other as pressure outlet.

I am doing a thermal analysis of the tunnel, and want to see how the temperature changes over time as air flow through it.

How do I go about doing this? I want the air coming out of the pressure outlet to go back into the tunnel at the velocity inlet. How can I do this so I can proceed with my transient model?

Please help!!

Thanks

jpo · December 7, 2010, 23:39

you will be able to see the temperature diff. dT between inlet/outlet

say, T_out(1) = T_in(1) + dT

If air is recycled, T_out(2) = Tin(1) + 2*dT

wouldn't this be enough, if u interested only in the temperature ?

Stef06 · December 8, 2010, 13:25

Thanks for your reply. I was considering this too, but I want to see how much time it will take for the air to be cooled to a certain temperature. Is there a way to see how long it takes the air to go thought one cycle (from the inlet to the outlet)?

December 7, 2010, 12:36	Wind tunnel boundary conditions	#1
Stef06 New Member Stef Join Date: Nov 2010 Posts: 7 Rep Power: 16	I am modeling a closed circuit wind tunnel in FLUENT. To simulate the fan, I have introduced a "cut" in the tunnel, assigning one of these edges as velocity inlet and the other as pressure outlet. I am doing a thermal analysis of the tunnel, and want to see how the temperature changes over time as air flow through it. How do I go about doing this? I want the air coming out of the pressure outlet to go back into the tunnel at the velocity inlet. How can I do this so I can proceed with my transient model? Please help!! Thanks

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December 7, 2010, 23:39		#2
jpo Member Join Date: Apr 2009 Posts: 94 Rep Power: 17	you will be able to see the temperature diff. dT between inlet/outlet say, T_out(1) = T_in(1) + dT If air is recycled, T_out(2) = Tin(1) + 2*dT wouldn't this be enough, if u interested only in the temperature ?

December 8, 2010, 13:25		#3
Stef06 New Member Stef Join Date: Nov 2010 Posts: 7 Rep Power: 16	Thanks for your reply. I was considering this too, but I want to see how much time it will take for the air to be cooled to a certain temperature. Is there a way to see how long it takes the air to go thought one cycle (from the inlet to the outlet)?