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Boundary condition for conjugate thermal heat conduction |
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April 11, 2015, 08:00 |
Boundary condition for conjugate thermal heat conduction
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#1 |
Senior Member
Mehdi Asghari
Join Date: Feb 2010
Posts: 127
Rep Power: 16 |
Hi all;
What kind of boundary condition is suitable for interface of two solid part jointed together (in the presence of conjugate conduction heat transfer )? If the answer is mixed boundary, what kind of mixed boundary should I select in OF2.3.1? Thx for any answer& help. |
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April 11, 2015, 14:56 |
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#2 | |
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Derek Mitchell
Join Date: Mar 2014
Location: UK, Reading
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Quote:
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April 12, 2015, 03:31 |
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#3 |
Senior Member
Mehdi Asghari
Join Date: Feb 2010
Posts: 127
Rep Power: 16 |
Dear Derekm,
Thanks! I look in them. The codes are similar to following ones: Code:
"leftSolid_to_.*" { type compressible::turbulentTemperatureCoupledBaffleMixed; Tnbr T; kappa solidThermo; kappaName none; value uniform 300; } 1-What is the difference between compressible::turbulentTemperatureCoupledBaffleMix ed and calculated? 2-What's the reason for use of turbulent and compressiblenomeclature in this boundary condition type? Specially, since there isn't any fluid region in the my problem . 3-What is the deference in terms of thicknessLayer and kappaLayers between above and following code (used in the same changeDictionaryDict file)? Code:
leftSolid_to_heater { type compressible::turbulentTemperatureCoupledBaffleMixed; Tnbr T; kappa solidThermo; kappaName none; thicknessLayers (1e-3); kappaLayers (5e-4); value uniform 300; } |
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April 13, 2015, 04:09 |
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#4 |
New Member
Gautam Saikia
Join Date: Jan 2015
Location: India
Posts: 12
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Hi Asghari
I am also struggling with the boundary conditions for CHT cases. From my experience I can answer a bit of your 1st question. The BC "compressible::turbulentTemperatureCoupledBaffleMix ed" is used primarily for coupling between a solid and a fluid region through interface. And the BC "calculated" is used when one does want to give the value directly rather derive it from other values using equations. I hope this helps you. Please let me know if I am wrong somewhere. Regards Gautam |
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April 13, 2015, 09:28 |
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#5 | |
New Member
Join Date: Mar 2015
Location: Earth yet
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Quote:
I am a newbie in OF, though it's been about two months that I am working on a multi-region conduction (so far) problem. I guess I improoved enough to be able to answer or at least give some insight to your questions. 2- Neither I have a fluid region yet (though I hope I will get to the point to add some), but if you use any different coupling condition as can be found in the forum regarding old OF version, an error message will pop up in log showing a list of possible entries. None of them will be suitable-er than that one indeed. I guess most people using OF are more interested in solid couplings with compressible turbulent fluid regions and so far there is no multiRegionLaplacian (or Conduction) solver... 3- The second code quoted has some addictional thermal contact resistance between two solids with properties defined by the two entries, thickness and conductivity of the resistance layer... Hope it helped you out! |
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April 13, 2015, 09:48 |
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#6 | |
Senior Member
Mehdi Asghari
Join Date: Feb 2010
Posts: 127
Rep Power: 16 |
Quote:
I think it is possible to use compressible::turbulentTemperatureCoupledBaffleMix ed for solid to solid interfaces. My reason for this comment is this fact that in CHT tutorial and in changeDictionaryDict, I saw follow interface type: Code:
leftSolid_to_heater { type compressible::turbulentTemperatureCoupledBaffleMixed; Tnbr T; kappa solidThermo; kappaName none; thicknessLayers (1e-3); kappaLayers (5e-4); value uniform 300; } But this is something that I do not understand why compressible and turbulent has been used in nomenclature of this interface type (compressible::turbulentTemperatureCoupledBaffleMixed). |
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April 13, 2015, 23:39 |
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#7 |
New Member
Gautam Saikia
Join Date: Jan 2015
Location: India
Posts: 12
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Hello Asghari
I completely agree with you. That is why I mentioned in my post "used primarily". I meant to say it has nothing much to do with the nomenclature. Regards Gautam |
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April 14, 2015, 09:24 |
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#8 |
Senior Member
Mehdi Asghari
Join Date: Feb 2010
Posts: 127
Rep Power: 16 |
Dear Friends!
All of your replies were actually helpful. Best wishes for you. M.Asghari |
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