PorousMedia Problem with Temperature Distribution

pawan · July 18, 2008, 06:48

I am trying to simulate the steady turbulent fluid flow through Porous region in a converging-diverging pipe. The porous media extend from the end of diverging section to start of converging section as showing in image

.

I am using rhoImplicitPorousSimpleFoam

Turbulence Model
k-Epsilon model is used

Boundary condition
Inlet:
mass flow Inlet = 0.417 kg/s
Total Temperature = 811K
Outlet:
Pressure Outlet = 15000 Pa (gauge pressure)
Wall:
Insulated

ThermoPhysical properties are same in both fluent and openfoam.
mixture
air 1 28.966 1006.43 0 1.789e-05 0.74417

Porous Region coeff
i j k
d =4.67e+07 4.67e+09 4.67e+09
f = 10 1000 1000

Problem(doubt)
Under steady state , fluent show a temperature range of 809-811K , while in openfoam this range extend form 791-811 K . as showning fig

and

AS wall is insulated , and there is no such energy loss, such large temperature drop should not be there logically.

However Other variable as pressure, velocity show the trend and range same as in fluent .

Can anyone explain this behavior or point out where am i wrong in setting case ?

Chrisi1984 · May 10, 2010, 06:12

Hi!

How have you solved the problem?
I have the same problem with porous media.
My pressure and velocities are very similar to the results of fluent, but my temperature field is looking different.

Greets Chris

Kittipos · August 2, 2015, 23:08

Hi

I used OpenFoam and I have a problem same as you.

Could you describe to me pls.

Thx

July 18, 2008, 06:48	I am trying to simulate the st	#1
pawan New Member Pawan Join Date: Mar 2009 Location: Pune, Maharastra, India Posts: 3 Rep Power: 17	I am trying to simulate the steady turbulent fluid flow through Porous region in a converging-diverging pipe. The porous media extend from the end of diverging section to start of converging section as showing in image . I am using rhoImplicitPorousSimpleFoam Turbulence Model k-Epsilon model is used Boundary condition Inlet: mass flow Inlet = 0.417 kg/s Total Temperature = 811K Outlet: Pressure Outlet = 15000 Pa (gauge pressure) Wall: Insulated ThermoPhysical properties are same in both fluent and openfoam. mixture air 1 28.966 1006.43 0 1.789e-05 0.74417 Porous Region coeff i j k d =4.67e+07 4.67e+09 4.67e+09 f = 10 1000 1000 Problem(doubt) Under steady state , fluent show a temperature range of 809-811K , while in openfoam this range extend form 791-811 K . as showning fig and AS wall is insulated , and there is no such energy loss, such large temperature drop should not be there logically. However Other variable as pressure, velocity show the trend and range same as in fluent . Can anyone explain this behavior or point out where am i wrong in setting case ?

May 10, 2010, 06:12	The same like me	#2
Chrisi1984 Senior Member Join Date: Jan 2010 Location: Stuttgart Posts: 150 Rep Power: 16	Hi! How have you solved the problem? I have the same problem with porous media. My pressure and velocities are very similar to the results of fluent, but my temperature field is looking different. Greets Chris

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August 2, 2015, 23:08		#3
Kittipos New Member Ipos Join Date: Feb 2015 Posts: 7 Rep Power: 11	Hi I used OpenFoam and I have a problem same as you. Could you describe to me pls. Thx