temperature inlet bondary condition

ypchen · October 19, 2011, 00:11

Hi, everybody

My inlet BC type in FLUENT is "pressure inlet", and I want to use the BC as below : dT/dX = 0 where T is temperature and X is normal to the inlet bondary, and my case is 2-D. By reading the FLUENT guideline, I think this BC may use the UDF code to edit this condition, but I don't know how to solve the temperature gradient by using the code, can anyone help me? Thank you very much .

cartman · October 19, 2011, 08:09

First of all

Don't Thrust me, because I am a newbie

I think you can use "pressure inlet" when du/dx=0..

or... I don't know(sorry

) mabye UDF can save you.

you don't mean adibatic wall, right?

ypchen · October 19, 2011, 23:36

Hi, Cartman

My original inlet BC is : n●grad(T) = 0 where n is normal direction vector and grad means gradient. So it can be simplified to dT/dX = 0.This condition means I neglect the inlet thermal conduction effect.

October 19, 2011, 00:11	temperature inlet bondary condition	#1
ypchen New Member Yu-Pei Chen Join Date: Jun 2011 Posts: 26 Rep Power: 14	Hi, everybody My inlet BC type in FLUENT is "pressure inlet", and I want to use the BC as below : dT/dX = 0 where T is temperature and X is normal to the inlet bondary, and my case is 2-D. By reading the FLUENT guideline, I think this BC may use the UDF code to edit this condition, but I don't know how to solve the temperature gradient by using the code, can anyone help me? Thank you very much .

October 19, 2011, 08:09		#2
cartman Member Chris, Kam Join Date: Nov 2010 Location: Busan, South Korea Posts: 42 Rep Power: 15	First of all Don't Thrust me, because I am a newbie I think you can use "pressure inlet" when du/dx=0.. or... I don't know(sorry) mabye UDF can save you. you don't mean adibatic wall, right?

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October 19, 2011, 23:36		#3
ypchen New Member Yu-Pei Chen Join Date: Jun 2011 Posts: 26 Rep Power: 14	Hi, Cartman My original inlet BC is : n●grad(T) = 0 where n is normal direction vector and grad means gradient. So it can be simplified to dT/dX = 0.This condition means I neglect the inlet thermal conduction effect.