UDF for linear temperature variation

nonstopthinker · September 18, 2016, 11:01

Hello People,

I am modelling a coolant channel in the shape of a rectangular prism with the following conditions:

Inlet temperature, Ti = 130 K (at the inlet face)
Outler pressure Pe = 70 bar at outlet face
A constant mass flux of 21800 kg/m2s methane flow
Top wall temperature of the rectagular prism (top face) = 130 K
Bottom wall temperature of the rectangular prism (bottom face) = 600 K

the dimensions for the rectangular prism are as follows:

L=300 mm B= 0.889 mm and H= 1.778 mm

Now i want to give a linear temperature variation for the 2 side walls and the fluid flowing inside it between the top wall temperature and bottom wall temperature. I am completely new to this concept of udf. Kindly help in programming the same. Thanks a lot in advance.

pakk · September 19, 2016, 05:59

You will want to use a DEFINE_PROFILE. Look in the Fluent Manual for an example (example 1) that is pretty close to what you want. Just replace pressure by temperature, and change the equation.

September 18, 2016, 11:01	UDF for linear temperature variation	#1
nonstopthinker New Member Join Date: Sep 2016 Posts: 10 Rep Power: 9	Hello People, I am modelling a coolant channel in the shape of a rectangular prism with the following conditions: Inlet temperature, Ti = 130 K (at the inlet face) Outler pressure Pe = 70 bar at outlet face A constant mass flux of 21800 kg/m2s methane flow Top wall temperature of the rectagular prism (top face) = 130 K Bottom wall temperature of the rectangular prism (bottom face) = 600 K the dimensions for the rectangular prism are as follows: L=300 mm B= 0.889 mm and H= 1.778 mm Now i want to give a linear temperature variation for the 2 side walls and the fluid flowing inside it between the top wall temperature and bottom wall temperature. I am completely new to this concept of udf. Kindly help in programming the same. Thanks a lot in advance. Last edited by nonstopthinker; September 19, 2016 at 02:26.

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September 19, 2016, 05:59		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	You will want to use a DEFINE_PROFILE. Look in the Fluent Manual for an example (example 1) that is pretty close to what you want. Just replace pressure by temperature, and change the equation.