heat transfer through porous medium

myworkcfd · June 6, 2017, 06:04

Hi
Iam trying to simulate the heat transfer through porous medium.
Air enters and leaves the porous medium(porous medium-bottom wall is hot).

I have created the model in GAMBIT.I have taken a big domain, have split it in to 3 regions,named the middle region as porous , while left and right of porous are fluids.
If I specify the both the interfaces (left and right of porous medium)as wall in GAMBIT , 2 walls and corresponding wall shadows are formed in fluent. I have specified the fluid as air.Specified the porous medium parameters also.The case is not converging in FLUENT.

If I do not specify the interface in GAMBIT, the case converges.

Which method is correct?

KaLium · June 6, 2017, 07:04

So there is no air flow from from porous zone to fluid zone? Only heat?

Then you need define both the wall and the wall-shadow as coupled wall.

myworkcfd · June 6, 2017, 07:55

Thanks for the reply.
There is flow of air from fluid zone to porous zone.
If I take 2interfaces as interiors, with out heat transfer, there is flow through porous medium, and the case converges.

For heat transfer case, I need to make that 2 interfaces as 2walls and 2wall shadows.Then, if I run the case, the residuals are not converging.

Kushal Puri · June 6, 2017, 12:52

Quote:

Originally Posted by myworkcfd

Thanks for the reply.
There is flow of air from fluid zone to porous zone.
If I take 2interfaces as interiors, with out heat transfer, there is flow through porous medium, and the case converges.

For heat transfer case, I need to make that 2 interfaces as 2walls and 2wall shadows.Then, if I run the case, the residuals are not converging.

Why u r making two interfaces as walls for the heat transfer case.

myworkcfd · June 6, 2017, 23:57

Else how will it calculate Heat transfer?

If there is a fluid on one side and solid on the other side, then a wall at the interface should be given coupled wall condition to balance the transfer at the surface.

If it is a wall, between two fluids, for the flow to happen, the interface should be 'interior'.
For heat transfer, what should be the condition at the interface?

June 6, 2017, 06:04	heat transfer through porous medium	#1
myworkcfd New Member Join Date: Jun 2017 Posts: 20 Rep Power: 8	Hi Iam trying to simulate the heat transfer through porous medium. Air enters and leaves the porous medium(porous medium-bottom wall is hot). I have created the model in GAMBIT.I have taken a big domain, have split it in to 3 regions,named the middle region as porous , while left and right of porous are fluids. If I specify the both the interfaces (left and right of porous medium)as wall in GAMBIT , 2 walls and corresponding wall shadows are formed in fluent. I have specified the fluid as air.Specified the porous medium parameters also.The case is not converging in FLUENT. If I do not specify the interface in GAMBIT, the case converges. Which method is correct?

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June 6, 2017, 07:04		#2
KaLium Senior Member Kal-El Join Date: Apr 2017 Location: Finland Posts: 150 Rep Power: 9	So there is no air flow from from porous zone to fluid zone? Only heat? Then you need define both the wall and the wall-shadow as coupled wall.

June 6, 2017, 07:55		#3
myworkcfd New Member Join Date: Jun 2017 Posts: 20 Rep Power: 8	Thanks for the reply. There is flow of air from fluid zone to porous zone. If I take 2interfaces as interiors, with out heat transfer, there is flow through porous medium, and the case converges. For heat transfer case, I need to make that 2 interfaces as 2walls and 2wall shadows.Then, if I run the case, the residuals are not converging.

June 6, 2017, 23:57		#5
myworkcfd New Member Join Date: Jun 2017 Posts: 20 Rep Power: 8	Else how will it calculate Heat transfer? If there is a fluid on one side and solid on the other side, then a wall at the interface should be given coupled wall condition to balance the transfer at the surface. If it is a wall, between two fluids, for the flow to happen, the interface should be 'interior'. For heat transfer, what should be the condition at the interface?