BC: externalWallHeatFluxTemperature
 

Hi everyone,

I am trying to use externalWallHeatFluxTemperature bc in one of my boundary. While running the solver for buoyantBoussinesqSimpleFoam I am getting this message:-

"FOAM FATAL ERROR:
Kappa defined to employ fluidThermo method, but thermo package not available
From function temperatureCoupledBase::kappa(const scalarField&) const
in file derivedFvPatchFields/temperatureCoupledBase/temperatureCoupledBase.C at line 116."

Can anyone please suggest me how to overcome this error??

Thanking you in advance
Gautam

Hi,
can you please post your T file?
Which version of OF are you using?

And what models do you use for thermophysical properties?

Hello TobM

Thanks for your reply. I am attaching the "T" and "thermophysicalProperties" file here for better understanding. Please let me know if any further information required.

I am using OpenFoam version 2.3.0

Regards
Gautam

Hi,

your T file seems to be correct.
I can't say for sure what the problem is in your case, but my guess is, it has something to do with the thermophysical model.
Maybe try to change it and see if the the error still occurs. One other guess is that you can try to specify the kappa field in the boundary conditions.

Sry that I'm unable to help you.

Thanks for your suggestions Tob. I also got to know that the BC is for compressible solver only. So its not working with the incompressible solver I am trying to use. Either I need to use a different solver (but will not be helpful because I am using incompressible fluid) or I need to work with the BC to implement it for incompressible flows.

externalHeatFluxTemperature
 

Hi gautom,

I have a similar problem of incompressible flow. could you able to implement the B:C for incompressible solvers?

This is the thread.

http://www.cfd-online.com/Forums/ope...tml#post538969

could you help me to implement the Boundary condition for Incompressible flows.

Regards,
Naresh

Hi Naresh

I gave the answer in your thread. Have a look.

hey gomsy,

I am facing the exact same problem at the moment. (How) did you eventually solve it?

Leo

After some more searching I found this:

http://www.cfd-online.com/Forums/ope...ionfoam-2.html


For the interested:

I'm calculating coupled heat transfer in a fluid and solid region with chtMultiRegionSimpleFoam. In my 0/solid/T file I had the entry for the patch 'solidToFluid' defined with fluidThermo instead of solidThermo.

Hope this helps someone :)

Hello friend,
I am using also the same boundary conditions. Can you please tell me kappa denotes the thermal conductivity or else????
Is kappa file required in 0 folder for running constant heat flux boundary condition e.g. external wall heat flux temperature.

yes, kappa denotes the thermal conductivity.

Having a kappa file in the 0 folder would mean it's a field magnitude (that means it has different values in different locations in your case)
kappa is a material value, so it belongs probably in the transportProperties file in the constant folder.

It's been a while since i dealt with this stuff so there might also be some sort of kappa, that is a field magnitude, but then your solver would outright tell you that it needs that kind of file in the 0 folder.

hope this helps

Hello friend,
I am facing the same error .
Kappa means thermalconductivity or else???
You are telling to specify in BC means in '0' folder or somewhere else????

can you please send me a sample file for that???

externalWallHeatFluxTemperature boundary condition is only for compressible solver?