Variable temperature on the wall as the Boundary Condition

mbahonar · May 19, 2009, 22:06

Hi Everybody,

I am a new user (I am petroleum engineer) of Fluent 6.3 and I am modeling a 2D Natural Convection in a vertical cylindrical annulus. I would like to put a linear decrease in temperature on the inner wall of the cylinder (for instance 50 oC at the top of the cylinder and decreases linearly to 40 oC, i.e. T(Z,R=Ri)=50-Z where 0<=Z<=1 m (Hieght) and Ri is radius of inner wall). Would you please tell me if this is possible to do in Fluent. If yes, how?

Many Thanks in Advance,
Mehdi

Daniel Tanner · May 22, 2009, 17:50

You can use a "udf" (user defined function) to specify temperature as a function of the location on the boundary surface using DEFINE_PROFILE.
Google "udf" and "DEFINE_PROFILE" for more info.

May 19, 2009, 22:06	Variable temperature on the wall as the Boundary Condition	#1
mbahonar New Member Mehdi Join Date: May 2009 Posts: 1 Rep Power: 0	Hi Everybody, I am a new user (I am petroleum engineer) of Fluent 6.3 and I am modeling a 2D Natural Convection in a vertical cylindrical annulus. I would like to put a linear decrease in temperature on the inner wall of the cylinder (for instance 50 oC at the top of the cylinder and decreases linearly to 40 oC, i.e. T(Z,R=Ri)=50-Z where 0<=Z<=1 m (Hieght) and Ri is radius of inner wall). Would you please tell me if this is possible to do in Fluent. If yes, how? Many Thanks in Advance, Mehdi

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May 22, 2009, 17:50		#2
Daniel Tanner Member Daniel Tanner Join Date: Apr 2009 Posts: 54 Rep Power: 18	You can use a "udf" (user defined function) to specify temperature as a function of the location on the boundary surface using DEFINE_PROFILE. Google "udf" and "DEFINE_PROFILE" for more info.