question about OpenFoam-temperatureGradient boundary condition

gulru · March 24, 2011, 07:33

p { margin-bottom: 0.08in; } Hi all,

My problem is about applying temperature gradient to a wall in OpenFoam.

I have a rectangular box filled with gas and try to apply temperature gradient through the vertical axes. Therefore I put the fixedValue boundary condition for the up and down walls (for example 500C for up wall, 300c for down wall). But I don’t know how can I determined the boundary conditions for left and right walls.
How should I define the boundary conditions to obtain temperature gradient?

It maybe so simple question but I am new in OpenFoam. Therefore, I will be appreciate for any help.

p { margin-bottom: 0.08in; } Thank you very much....

Bernhard · March 24, 2011, 07:48

Did you try fixedGradient?

gulru · March 24, 2011, 12:50

p { margin-bottom: 0.08in; } Thank you very much for your help. Actually, I thought it but I could not understand how can I use .
I read something about the fixedGradient. At one of them it is mentioned that, fixed gradient evaluate data from internalfield. If I understand it right, internalfield should not be uniform for that case. It can be define as non-uniform, but I don't have data for defining non- uniform internalfield ( for non-uniform field definition, I should have some data about temperature for each position point). Therefore I couldn't decide about fixedgradient.

If you know how can i use fixed gradient boundary condition with internalfield, could you please help me?

Moreover I am also a little bit confused about gradient value defined for fixedgradient. I am not sure that manual entry for gradient value can represent the system correctly. Actually I thought that, the program does calculates the temperature value along the wall boundaries by using hot and low temperature given for up and down wall??

March 24, 2011, 07:33	question about OpenFoam-temperatureGradient boundary condition	#1
gulru New Member gulru Join Date: Mar 2011 Posts: 3 Rep Power: 15	p { margin-bottom: 0.08in; } Hi all, My problem is about applying temperature gradient to a wall in OpenFoam. I have a rectangular box filled with gas and try to apply temperature gradient through the vertical axes. Therefore I put the fixedValue boundary condition for the up and down walls (for example 500C for up wall, 300c for down wall). But I don’t know how can I determined the boundary conditions for left and right walls. How should I define the boundary conditions to obtain temperature gradient? It maybe so simple question but I am new in OpenFoam. Therefore, I will be appreciate for any help. p { margin-bottom: 0.08in; } Thank you very much....

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March 24, 2011, 07:48		#2
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 22	Did you try fixedGradient?

March 24, 2011, 12:50		#3
gulru New Member gulru Join Date: Mar 2011 Posts: 3 Rep Power: 15	p { margin-bottom: 0.08in; } Thank you very much for your help. Actually, I thought it but I could not understand how can I use . I read something about the fixedGradient. At one of them it is mentioned that, fixed gradient evaluate data from internalfield. If I understand it right, internalfield should not be uniform for that case. It can be define as non-uniform, but I don't have data for defining non- uniform internalfield ( for non-uniform field definition, I should have some data about temperature for each position point). Therefore I couldn't decide about fixedgradient. If you know how can i use fixed gradient boundary condition with internalfield, could you please help me? Moreover I am also a little bit confused about gradient value defined for fixedgradient. I am not sure that manual entry for gradient value can represent the system correctly. Actually I thought that, the program does calculates the temperature value along the wall boundaries by using hot and low temperature given for up and down wall??