# heat transfer with OpenFoam

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 March 21, 2011, 03:43 heat transfer with OpenFoam #1 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 Dear all, I want to model a turbulent flow with heat transfer caused by forced convection and radiation. How can I model that with OF. I have checked the tutorial files of the heat transfer solvers. I every solver-file there are the following files: alphatwallfunction, epsilon, k, nut, p, p_rgh, T, T.org, U. - What is the meaning of them (T=temperature, U=velocity.)? - Is it possible to enter a heat transfer coefficient calculated by my own or does OF calculate everything by itself? Thank you for your answer. Best Regards, tH3f0rC3

 March 21, 2011, 17:54 #2 New Member   Fatih Join Date: Sep 2010 Location: Hamburg Posts: 12 Rep Power: 9 hi, may be this will help you: -alphatWallFunction=turbulent thermal diffusity (or eddy thermal diffusity) -k=turbulent energy -epsilon=dissipation -nut=turbulent viscosity -p=pressure, exact: pressure/rho for inkompressible Solver -p_rgh=hydrostatic pressure p_0+rho*g*h (same as above p_0/rho+g*h); if g=(0 0 0) than p=p_rgh -T=temperature [K] -T.org=backup for T -U=velocity (vector) and the last, which you forget -kappat=turbulent thermal conductivity i think you define the heat transfer coefficient over the Pr in transportProperties. but i'm not sure. palmerlee and mgg like this.

 March 22, 2011, 03:03 #3 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 Thank you for your answer! I have now checked the buoyantSimpleRadiationFoam-solver. There are some more files. Do you know the meaning of them, too? G mut Regards, tH3f0rC3

 March 22, 2011, 03:48 #4 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 I have tried to use the buoyantSimpleRadiationFoam-solver for an easy model. The folliwing error appears: Create time Create mesh for time = 0 Reading g Reading thermophysical properties Selecting thermodynamics package hPsiThermo>>>> #0 Foam::error:rintStack(Foam::Ostream&) in "/data/caehgb.za/studienarbeit-di rk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOA M.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/data/caehgb.za/studienarbeit-dirk/work /OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so" #2 __restore_rt in "/lib64/tls/libc.so.6" #3 Foam::hPsiThermo > > > >::calculate() in "/data/caehgb.za/stu dienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPO pt/libbasicThermophysicalModels.so" #4 Foam::hPsiThermo > > > >::hPsiThermo(Foam::fvMesh const&) in "/data/caehgb.za/studienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7 .1/lib/linux64GccDPOpt/libbasicThermophysicalModels.so" #5 Foam::basicPsiThermo::addfvMeshConstructorToTable< Foam::hPsiThermo > > > > >::New(Foam::fvMesh const&) in "/data/caehgb.za/studienarbeit-dirk /work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libbasicTher mophysicalModels.so" #6 Foam::basicPsiThermo::New(Foam::fvMesh const&) in "/data/caehgb.za/studienar beit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/lib basicThermophysicalModels.so" #7 main in "/data/caehgb.za/studienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/ OpenFOAM-1.7.1/applications/bin/linux64GccDPOpt/buoyantSimpleRadiationFoam" #8 __libc_start_main in "/lib64/tls/libc.so.6" #9 Foam::regIOobject::writeObject(Foam::IOstream::str eamFormat, Foam::IOstream: :versionNumber, Foam::IOstream::compressionType) const in "/data/caehgb.za/studi enarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/applications/bin/li nux64GccDPOpt/buoyantSimpleRadiationFoam" Floating point exception Can someone help me? Maybe OF isn't installed correct? Regards

March 22, 2011, 03:53
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Quote:
 Originally Posted by ang_dipl_ing_fd hi, may be this will help you: -alphatWallFunction=turbulent thermal diffusity (or eddy thermal diffusity) -k=turbulent energy -epsilon=dissipation -nut=turbulent viscosity -p=pressure, exact: pressure/rho for inkompressible Solver -p_rgh=hydrostatic pressure p_0+rho*g*h (same as above p_0/rho+g*h); if g=(0 0 0) than p=p_rgh -T=temperature [K] -T.org=backup for T -U=velocity (vector) and the last, which you forget -kappat=turbulent thermal conductivity i think you define the heat transfer coefficient over the Pr in transportProperties. but i'm not sure.
Hi ang_dipl_ing_fd,

do you also know the following:
In the thermophysical properties:
mixture air 1 28.9 1000 0 1.8e-05 0.7;

What does that mean?
Does every number have a meaning?

Best Regards

 March 22, 2011, 04:38 #6 Member   Alpesh Vora Join Date: Jan 2011 Location: Cottbus, Germany Posts: 47 Rep Power: 8 Hi In the thermophysical properties: mixture air 1 28.9 1000 0 1.8e-05 0.7; The thermalPhsical Properties is calculated based which model you specified, like if model is hPsiThermo, calculation based on enthalpy 'h' and compressibility 'psi'. and if model is hRhoThermo, calculation based on enthalpy or sensible enthalpy. and if model is pureMixture, calculation based on passive gas mixtures. parameters : air is mixture fluid name 1 is for pure Mixture (mixture property) (number of molecules of species) 28.9 for molecule weight (kg/kmol) 1000 for heat capacity at constant pressure [J/kmol K] 0 for reference enthalpy [J/kmol] 1.8e-05 for Dynamics viscosity (kg/ms) 0.7 is for Prandtl number. you can change properties according to your problem (fluid). best luck Alpesh

March 22, 2011, 04:58
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Samuel ARNAUD
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Quote:
 Originally Posted by tH3f0rC3 Hi ang_dipl_ing_fd, do you also know the following: In the thermophysical properties: mixture air 1 28.9 1000 0 1.8e-05 0.7; What does that mean? Does every number have a meaning? Best Regards
Hi tH3f0rc3 (hard to say :-p)

As far as I know:

1 => Number of moles of this specie
28,9 => Molecular weight
1000 => Cp (Specific heat capacity)
0 => heat of fusion (useless, I guess in your case)
1.8e-05 => dynamic viscosity
0.7 => Prantl number

Quote:
 Originally Posted by tH3f0rC3 Reading g Reading thermophysical properties Selecting thermodynamics package hPsiThermo>>>> #0 Foam::error:rintStack(Foam::Ostream&) in "/data/caehgb.za/studienarbeit-di rk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOA M.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/data/caehgb.za/studienarbeit-dirk/work /OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so" #2 __restore_rt in "/lib64/tls/libc.so.6" #3 Foam::hPsiThermo > > > >::calculate() in "/data/caehgb.za/stu dienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPO pt/libbasicThermophysicalModels.so" #4 Foam::hPsiThermo > > > >::hPsiThermo(Foam::fvMesh const&) in "/data/caehgb.za/studienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7 .1/lib/linux64GccDPOpt/libbasicThermophysicalModels.so" #5 Foam::basicPsiThermo::addfvMeshConstructorToTable< Foam::hPsiThermo > > > > >::New(Foam::fvMesh const&) in "/data/caehgb.za/studienarbeit-dirk /work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libbasicTher mophysicalModels.so" #6 Foam::basicPsiThermo::New(Foam::fvMesh const&) in "/data/caehgb.za/studienar beit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/lib basicThermophysicalModels.so" #7 main in "/data/caehgb.za/studienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/ OpenFOAM-1.7.1/applications/bin/linux64GccDPOpt/buoyantSimpleRadiationFoam" #8 __libc_start_main in "/lib64/tls/libc.so.6" #9 Foam::regIOobject::writeObject(Foam::IOstream::str eamFormat, Foam::IOstream: :versionNumber, Foam::IOstream::compressionType) const in "/data/caehgb.za/studi enarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/applications/bin/li nux64GccDPOpt/buoyantSimpleRadiationFoam" Floating point exception
I'm also interested in this matter (I've got the same issue but with chtMultiRegionSimpleFoam). Someone clever than us? ^^

Cheers guys

: I was too slow, apparently (damn coffee break ! :-D), sorry for this double answer
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Sam

 March 22, 2011, 05:26 #8 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 Hey, thanks for your answer. Do you also know, where I can type in the properties of the walls, for example that a wall consists of nickel? Regards, tH3f0rC3

 March 22, 2011, 06:28 #9 Member   Samuel ARNAUD Join Date: Feb 2011 Location: Grenoble, FRANCE Posts: 39 Rep Power: 8 It depends what you want to do: for a fixed temperature wall, you don't need to input any properties. (only create a radiationProperties file => check the tutorial hotRadiationRoom). In 0/T, fixe the wall temperature. If you're really eager to use the wall properties, include it in the mesh and use a MultiRegion solver (much more complicated, for my level of knowledge obviously). cheers __________________ Sam

 March 22, 2011, 06:44 #10 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 OK, but I think i have to gibe the solver an information of the material which should be heaten up. For example the density or cp... Where can I do that? Best Regards, tH3f0rC3

 March 22, 2011, 06:47 #11 Member   Samuel ARNAUD Join Date: Feb 2011 Location: Grenoble, FRANCE Posts: 39 Rep Power: 8 I think I got your case wrong: Can you explain briefly what your heat transfer consist in? And add your directories files also, if you don't mind. __________________ Sam

 March 22, 2011, 06:58 #12 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 I want to simulate a heat transfer from a turbulent (I guess so) flow to a surface, that should be heaten up. In addition to that there is also radiation from the hot wall to the surface. If this description is too short, please let me know. Which files do you want to see? Regards, tH3f0rC3 Last edited by tH3f0rC3; March 22, 2011 at 07:13.

March 22, 2011, 07:18
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Quote:
 Originally Posted by sixwp Hi tH3f0rc3 (hard to say :-p) I'm also interested in this matter (I've got the same issue but with chtMultiRegionSimpleFoam). Someone clever than us? ^^
Hi sixwp,

it is exactly the same issue just with other file dorectory?

Regards

March 22, 2011, 09:38
#14
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Samuel ARNAUD
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Quote:
 Originally Posted by tH3f0rC3 I want to simulate a heat transfer from a turbulent (I guess so) flow to a surface, that should be heaten up. In addition to that there is also radiation from the hot wall to the surface. If this description is too short, please let me know. Which files do you want to see? Regards, tH3f0rC3
I'm sorry, I must be tired, I don't really see what's your geometry's like. Can you show me a raw scheme?

Concerning the directories files: can you post your 0, constant and system folders? Maybe (not likely but, who knows), I'll be able to find out your problem and therefore, mine :-)
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Sam

 March 22, 2011, 09:42 #15 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 Yes, of course. But you have to give me an email adress of yours, because I can't post fotos. Regards

 March 23, 2011, 06:57 #16 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 Hi, is there someone else, who understands the following error message? Create time Create mesh for time = 0 Reading g Reading thermophysical properties Selecting thermodynamics package hPsiThermo>>>> #0 Foam::error:rintStack(Foam::Ostream&) in "/data/caehgb.za/studienarbeit-di rk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOA M.so" #1 Foam::sigFpe::sigFpeHandler(int) in "/data/caehgb.za/studienarbeit-dirk/work /OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libOpenFOAM.so" #2 __restore_rt in "/lib64/tls/libc.so.6" #3 Foam::hPsiThermo > > > >::calculate() in "/data/caehgb.za/stu dienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPO pt/libbasicThermophysicalModels.so" #4 Foam::hPsiThermo > > > >::hPsiThermo(Foam::fvMesh const&) in "/data/caehgb.za/studienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7 .1/lib/linux64GccDPOpt/libbasicThermophysicalModels.so" #5 Foam::basicPsiThermo::addfvMeshConstructorToTable< Foam::hPsiThermo > > > > >::New(Foam::fvMesh const&) in "/data/caehgb.za/studienarbeit-dirk /work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/libbasicTher mophysicalModels.so" #6 Foam::basicPsiThermo::New(Foam::fvMesh const&) in "/data/caehgb.za/studienar beit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/lib/linux64GccDPOpt/lib basicThermophysicalModels.so" #7 main in "/data/caehgb.za/studienarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/ OpenFOAM-1.7.1/applications/bin/linux64GccDPOpt/buoyantSimpleRadiationFoam" #8 __libc_start_main in "/lib64/tls/libc.so.6" #9 Foam::regIOobject::writeObject(Foam::IOstream::str eamFormat, Foam::IOstream: :versionNumber, Foam::IOstream::compressionType) const in "/data/caehgb.za/studi enarbeit-dirk/work/OpenFoam_ParaView/OpenFOAM/OpenFOAM-1.7.1/applications/bin/li nux64GccDPOpt/buoyantSimpleRadiationFoam" Floating point exception

 March 23, 2011, 08:40 #17 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 I know now, that this error message appears every time I want to involve the heat transfer. Maybe this helps.

 March 27, 2011, 15:57 #18 New Member   Fatih Join Date: Sep 2010 Location: Hamburg Posts: 12 Rep Power: 9 hi tH3f0rC3, did you run the tutorials without any change?

March 29, 2011, 02:46
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Quote:
 Originally Posted by tH3f0rC3 OK, but I think i have to gibe the solver an information of the material which should be heaten up. For example the density or cp... Where can I do that? Best Regards, tH3f0rC3
Hi,

if I get you right you just have one fluid domain.
If you want to know the interaction of the fluid with a connected solid than you need a multiregion solver.
(density and cp are values connected to a volume and not to a surface)

Regards,
Toni

 March 30, 2011, 02:24 #20 Senior Member   Join Date: Mar 2011 Posts: 155 Rep Power: 8 Hello, I have another question to -k=turbulent energy -epsilon=dissipation -nut=turbulent viscosity I have to set up these files in the 0-file as boundary cinditions. k and epsilon must have a value for the inlet surfaces. But how can I calculate these values? And what is meant with the values

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