adiabatic wall boundary condition

gtheo · April 14, 2011, 12:28

Hello

I'm using ANSYS CFX v12 to simulate the fluid flow and heat transfer in a rectangular duct. I impose an adiabatic wall boundary condition to the top surface of the fluid domain and a constant heat flux to the bottom one. The logical result is the absence of heat transfer near the upper wall. Instead the results I get show that the fluid is also heated from the top (adiabatic?!) wall. I have checked my boundary conditions and they are ok. Could the problem be related to the mesh? Any suggestions would be highly appreciated.

Thanks!

ghorrocks · April 15, 2011, 07:55

No, an adiabatic wall should not heat no matter what you do.

What makes you think the adiabatic wall is heating it?

gtheo · April 18, 2011, 10:06

Thank you for your swift reply!
Unfortunately, I didn't interpret my results correctly. The fluid is heated due to the effect of the lateral wall. I was confused because the heating took place near the vicinity of the upper boundary. Sorry to trouble you!

April 14, 2011, 12:28	adiabatic wall boundary condition	#1
gtheo New Member George Theo Join Date: Apr 2011 Posts: 13 Rep Power: 15	Hello I'm using ANSYS CFX v12 to simulate the fluid flow and heat transfer in a rectangular duct. I impose an adiabatic wall boundary condition to the top surface of the fluid domain and a constant heat flux to the bottom one. The logical result is the absence of heat transfer near the upper wall. Instead the results I get show that the fluid is also heated from the top (adiabatic?!) wall. I have checked my boundary conditions and they are ok. Could the problem be related to the mesh? Any suggestions would be highly appreciated. Thanks! amin_gls likes this.

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April 15, 2011, 07:55		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	No, an adiabatic wall should not heat no matter what you do. What makes you think the adiabatic wall is heating it?

April 18, 2011, 10:06		#3
gtheo New Member George Theo Join Date: Apr 2011 Posts: 13 Rep Power: 15	Thank you for your swift reply! Unfortunately, I didn't interpret my results correctly. The fluid is heated due to the effect of the lateral wall. I was confused because the heating took place near the vicinity of the upper boundary. Sorry to trouble you!