Jet Flow using OpenFoam

Zinedine · October 5, 2010, 11:14

Hi everyboy,
Has anybody have any experience in modelling jet flow and analysing CHT using Openfoam please?

Thank you very much for your help and assitance.

Regards

Z.

smehdi609 · October 6, 2010, 12:44

What is CHT !?

Zinedine · October 7, 2010, 03:59

Hi,
CHT mean Conjugate Heat Transfer.
I am interested in air flow jets past objects with some kind of
heat source (i.e. heat flux, temperatrure, etc..), and consequently this constitues a CHT problem.
Evidently the BCS are important in this kind of analysis and was wondering if they are some available OpenFoam cases.
If so I would be grateful if anybody could showm some useful links, etc..

Thanks for your help.

Regards

Z.

kumar · October 7, 2010, 04:11

Have a look at chtmultiregionFoam and rhoPimpleFoam. rhoPimpleFoam is more straightforward to set up.

regards
K.Suresh kumar

Zinedine · October 7, 2010, 05:33

Hi Kumar,
Thanks for your reply and your suggestion.
Do you have any exoperince in CHT with OpenFoam then?

What do you mean by: "rhoPimpleFoam is more straightforward to set up."

What is your experience in such CHT issue please?

Regards

Z.

kumar · October 7, 2010, 05:58

Hello Zinedine,
I have not studied the chtMultiregionFoam intensively but I had set up some simple cases on it for my Prof. Actually chtMultiregionFoam can be used to study problems where you have different regions like solid and fluid and you want to study the effects due to conduction in the solid and convection of heat due to to fluid. So you have a solid part solver and and fluid part solver.

The solid part solver in chtMultiRegionFoam is simply the heat conduction equation (this is the entire unmodified solveSolids.H)
The fluid solver, although one of the simpler, boyancy driven flow, is significantly more complex than the thermal equation. The flow equations are solved by separating flow parameters in density, pressure and velocity, solving these independently or recursively.
The thermal solver for the fluid region is essentially the same as for the solid part, although the variable solved for is the thermal energy rather than the temperature, as conventions differ between solid mechanics and fluid mechanics.

siince the boundary conditions have to be defined properly for the fluid region and the solid region and the interface between. You have to set a lot of things based on your problem.

I think in rhoPimplefoam you solve the fluid equations only with the energy equation.
You can find some explanation on the forum search for the name of the solvers.

bye regards
K.Suresh kumar

Zinedine · October 7, 2010, 06:06

Hi Kumar
Thanks fro taking the time to reply.
Actually through one of the thread in CFd-online I manged to get some
useful notes regarding "chtmultiregionFoam":
http://www.tfd.chalmers.se/~hani/kur...08/chtFoam.pdf .
Interesting brief note explaining the solver.

I just wonderign if one had any experince in setting up a cse with the aforementioned sover and clearly BCs are crucial.

Regards

Z.

October 5, 2010, 11:14	Jet Flow using OpenFoam	#1
Zinedine New Member Zinedine Join Date: Sep 2010 Posts: 19 Rep Power: 15	Hi everyboy, Has anybody have any experience in modelling jet flow and analysing CHT using Openfoam please? Thank you very much for your help and assitance. Regards Z.

October 7, 2010, 03:59	Re: Jet Flow using OpenFoam Reply to Thread	#3
Zinedine New Member Zinedine Join Date: Sep 2010 Posts: 19 Rep Power: 15	Hi, CHT mean Conjugate Heat Transfer. I am interested in air flow jets past objects with some kind of heat source (i.e. heat flux, temperatrure, etc..), and consequently this constitues a CHT problem. Evidently the BCS are important in this kind of analysis and was wondering if they are some available OpenFoam cases. If so I would be grateful if anybody could showm some useful links, etc.. Thanks for your help. Regards Z.

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October 6, 2010, 12:44		#2
smehdi609 Member M. Mahdi Salehi Join Date: Mar 2009 Location: Vancouver, BC, Canada Posts: 50 Rep Power: 17	What is CHT !?

October 7, 2010, 04:11		#4
kumar Senior Member Suresh kumar Kannan Join Date: Mar 2009 Location: Luxembourg, Luxembourg, Luxembourg Posts: 129 Rep Power: 17	Have a look at chtmultiregionFoam and rhoPimpleFoam. rhoPimpleFoam is more straightforward to set up. regards K.Suresh kumar

October 7, 2010, 05:33		#5
Zinedine New Member Zinedine Join Date: Sep 2010 Posts: 19 Rep Power: 15	Hi Kumar, Thanks for your reply and your suggestion. Do you have any exoperince in CHT with OpenFoam then? What do you mean by: "rhoPimpleFoam is more straightforward to set up." What is your experience in such CHT issue please? Regards Z.

October 7, 2010, 05:58		#6
kumar Senior Member Suresh kumar Kannan Join Date: Mar 2009 Location: Luxembourg, Luxembourg, Luxembourg Posts: 129 Rep Power: 17	Hello Zinedine, I have not studied the chtMultiregionFoam intensively but I had set up some simple cases on it for my Prof. Actually chtMultiregionFoam can be used to study problems where you have different regions like solid and fluid and you want to study the effects due to conduction in the solid and convection of heat due to to fluid. So you have a solid part solver and and fluid part solver. The solid part solver in chtMultiRegionFoam is simply the heat conduction equation (this is the entire unmodified solveSolids.H) The fluid solver, although one of the simpler, boyancy driven flow, is significantly more complex than the thermal equation. The flow equations are solved by separating flow parameters in density, pressure and velocity, solving these independently or recursively. The thermal solver for the fluid region is essentially the same as for the solid part, although the variable solved for is the thermal energy rather than the temperature, as conventions differ between solid mechanics and fluid mechanics. siince the boundary conditions have to be defined properly for the fluid region and the solid region and the interface between. You have to set a lot of things based on your problem. I think in rhoPimplefoam you solve the fluid equations only with the energy equation. You can find some explanation on the forum search for the name of the solvers. bye regards K.Suresh kumar

October 7, 2010, 06:06		#7
Zinedine New Member Zinedine Join Date: Sep 2010 Posts: 19 Rep Power: 15	Hi Kumar Thanks fro taking the time to reply. Actually through one of the thread in CFd-online I manged to get some useful notes regarding "chtmultiregionFoam": http://www.tfd.chalmers.se/~hani/kur...08/chtFoam.pdf . Interesting brief note explaining the solver. I just wonderign if one had any experince in setting up a cse with the aforementioned sover and clearly BCs are crucial. Regards Z.