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BoussinesqApproximation for incompressible flow |
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August 19, 2008, 07:45 |
Hi Fabian,
Thank you for at
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#21 |
Member
Masashi IMANO
Join Date: Mar 2009
Location: Tokyo, Japan
Posts: 34
Rep Power: 17 |
Hi Fabian,
Thank you for attaching your code again. As a matter of fact I have made fixed heat flux B.C. library like you have made, but I intentionally remove heat flux B.C from the airConditionedRoom tutorial case in order to decrease installation process like compiling addtional custom library. However the fixed flux B.C. is more general and elegant in this tutorial indeed, so I wrote a Wiki page of my fixed heat flux B.C. library and added an option to use heat flux B.C. into airConditionedRoom tutorial case. http://openfoamwiki.net/index.php/Contrib_wallHeatFlux http://openfoamwiki.net/index.php/Ma...onditionedRoom Please have a look at Wiki pages and source code for detail. The Last question about the wall function: The separate treatment for temperature might be needed indeed, but currently I have no plan to implement them soon... So I wish someone get started on them... Masashi |
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August 19, 2008, 13:24 |
Nice :-) Do you have a hint, a
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#22 |
Senior Member
Fabian Braennstroem
Join Date: Mar 2009
Posts: 407
Rep Power: 19 |
Nice :-) Do you have a hint, about implementing it?
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August 19, 2008, 13:24 |
... I mean the wall treatment.
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#23 |
Senior Member
Fabian Braennstroem
Join Date: Mar 2009
Posts: 407
Rep Power: 19 |
... I mean the wall treatment.
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November 4, 2008, 06:12 |
In the code by Masashi, the wa
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#24 |
Member
Christian Lindbäck
Join Date: Mar 2009
Posts: 55
Rep Power: 17 |
In the code by Masashi, the wall heat transfer is calculated as:
temperature gradient = q/(alpha_eff*Cp0*rho0) Cp will not vary much with temperature, but density will change more than negligable for my case. What do you think, wouldn't it be better to express rho in terms of rho0, beta, g, T and T0 (Boussinesq approximation)? Hope to have someones opinion. Regards, Christian Lindbäck |
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November 17, 2008, 03:56 |
Hi to all
What is beta here
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#25 |
Guest
Posts: n/a
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Hi to all
What is beta here? can anyone tell me? Emo |
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November 17, 2008, 04:35 |
Beta is the thermal expansion
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#26 |
New Member
Se-min JEONG
Join Date: Mar 2009
Location: Japan
Posts: 2
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Beta is the thermal expansion coefficient.
http://web.njit.edu/topics/Prog_Lang_Docs/html/FLUENT/fluent/fluent5/ug/html/nod e296.htm |
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November 17, 2008, 05:11 |
Hi Jeong
Thanks for the qui
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#27 |
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Hi Jeong
Thanks for the quick answer... but i could not open your site...is it without dimension or? thanks in advance!! |
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November 17, 2008, 07:26 |
Dear Emilian,
The dimensio
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#28 |
New Member
Se-min JEONG
Join Date: Mar 2009
Location: Japan
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Dear Emilian,
The dimension is [1/K]. You can check its dimension and value in the "/constant/transportProperties" file of the example directory. http://www.engineeringtoolbox.com/ai...ies-d_156.html http://en.wikipedia.org/wiki/Coeffic...rmal_expansion Jeong |
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November 28, 2008, 03:59 |
Dear Hrvoje,
is the Boussin
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#29 |
Guest
Posts: n/a
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Dear Hrvoje,
is the Boussinesq approximation solver /OpenFOAM-1.4.1-dev/applications/solvers/heatTransfer/boussinesqBuoyantFoam/ compatible with OpenFOAM-1.5? If not what modifications it request? Nicoleta |
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November 28, 2008, 05:38 |
I think it will work with no c
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#30 |
Senior Member
Hrvoje Jasak
Join Date: Mar 2009
Location: London, England
Posts: 1,905
Rep Power: 33 |
I think it will work with no changes - try to compile and see what happens.
There sound le no problems. Enjoy. Hrv
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Hrvoje Jasak Providing commercial FOAM/OpenFOAM and CFD Consulting: http://wikki.co.uk |
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May 13, 2009, 05:20 |
boussinesq approximation
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#31 |
New Member
Bintoro Aji
Join Date: Apr 2009
Posts: 1
Rep Power: 0 |
Hi,
I am new to OpenFoam. I'd like to solve the problem of natural convection heat transfer in rod bundle that generating 200 kW of power. Is the boussinesq approximation solver enough for this case, since there will be two phase flow when boiling happen? bintoro |
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July 15, 2009, 03:54 |
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#32 |
New Member
Praveen
Join Date: Mar 2009
Location: Goteborg, Sweden
Posts: 8
Rep Power: 17 |
hello Masashi,
I am trying to solve solidification problem and have written a code. Im using the wallHeatFlux BC for cooling the walls of the mould provided by you on the wiki page. When the liquid starts to solidify, i see that the temperature at the walls become lower and goes negative. could u give any suggestions about how to overcome this problem. |
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