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June 23, 2009, 14:48 |
Temperature Gradient at Wall
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#1 |
Member
Sven Winkler
Join Date: May 2009
Posts: 70
Rep Power: 17 |
I am simulating a laminar channel flow with heated walls. To calculate y nusselt number I first want to calculate the temperature gradient at the wall. Unfortunately I couldnt find some function similar to "WallGradU" which is able to calculate the wall temperature gradient, like "WallGradU" does it for the velocity gradient. Has anyone an idea how I could get the temperature gradient out of OpenFOAM? Can the "WallGradU" function be edited to get the temperature gradient?
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June 23, 2009, 23:18 |
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#2 |
Member
Jitao Liu
Join Date: Mar 2009
Location: Jinan , China
Posts: 64
Rep Power: 17 |
Hi sven,
I am interested in this problem too. I am new to OpenFOAM. I want to simulate the filling process of non-newtonian fluids into a heated cavity.The energy equation was added to the interFoam solver to calculate the temperature field. At the heated wall: 1) The temperature of non-newtonian fluid is assumed equal to the wall's (in my case,the thermal conductivity of the wall is much larger than that of the non-newtonian fluid ). 2) A coupled solver such as chtMultiRegionFoam can be created to solve this problem. Combination of heatConductionFoam and interHeatFoam (interFoam with energy equation) for conjugate heat transfer between a solid region and fluid region. I am working on the second part. If there is any development, please let me know. Best regards, Jitao Last edited by awacs; July 20, 2009 at 05:42. |
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June 24, 2009, 05:27 |
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#3 | |
Senior Member
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Hi Sven,
Make a copy of wallGradU, replace U with T, volVectorField with volScalarField and dimensionedVector with dimensionedScalar. It should work! Regards, Jose Santos Quote:
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June 24, 2009, 13:16 |
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#4 |
Member
Sven Schweikert
Join Date: Jun 2009
Posts: 38
Rep Power: 17 |
Hi Santos - thanks for your reply.
I have the same intention like sven and tried your advise. Sadly I received some errors while creating the new wallGradT: Line 80 - error: Expected primary-expressions before '(' token Line 83 - error: 'scalar' is not a class of namespace PHP Code:
About some additional help I would be really helpful. Thanks a lot & regards svens |
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June 24, 2009, 13:20 |
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#5 |
Senior Member
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Replace scalar::zero with 0 and all should be well.
Regards, Jose Santos |
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June 24, 2009, 16:23 |
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#6 |
Member
Sven Schweikert
Join Date: Jun 2009
Posts: 38
Rep Power: 17 |
It works! Perfect - thanks so much.
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July 23, 2010, 06:04 |
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#7 |
Senior Member
n/a
Join Date: Sep 2009
Posts: 199
Rep Power: 17 |
Question: I am able to compute the mean temperature gradient at a specified patch of my choosing. The is essentially 3D, hence the I have a 2D plane wall temperature gradient. Can anyone give me any feedback or advice as to how I can average the temperature gradient along a wall direction, so that I end with an output that comprises two columns such as: x dTmean/dn
x1 ***** x2 ***** Thanks. Deji |
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November 1, 2010, 18:25 |
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#8 | |
Member
Join Date: Nov 2009
Posts: 48
Rep Power: 17 |
Hello Jitao,
I would like to know if you were successful with your implementation. I am interested in such a coupled solver ( combination of heatConductionFoam and interHeatFoam ). I would be so grateful if you can help me. Thanks, Mehran Quote:
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