[Naresh yathuru]

Hi Foamers,

I m working with buoyantBoussinesqsimpleFoam in OF version 2.3.0. I want to implement externalwallheatFluxTemperature Bc in my case . my question is how to implement this B.c in incompressible solver as this is only for compressible solver?

Thank you
Naresh

[gomsy1987]

Hi Naresh

If you are trying to implement heat flux as boundary condition than you can use "fixedGradient" BC and give the gradient value, i.e. deltaT = q / k where k is the thermal conductivity.

Hope this helps you.

Best regards
Gautam

[Naresh yathuru]

Hi gautam,

First of all thanks for your reply. In my case i dont know the flux. so i have to specify the conductivity of the solid, virtual wall thickness, and heat transfer coeffecient h of outside air ,and outside temperature Ta.
At this point i would like to give clear information about my case, I have a room assume one side of the room(right wall) is expossed to environment t= 260k .so in this case I had to use a boundary condition that is similar to convective boundary condition in fluent. that is it considers the virtual wall thickness and outside temperature and thermal conductivity of the solid, heat transfer coeffecient h outside.

i tried groovyBC but without any sucess. i have posted my groovyBC under this link already.

http://www.cfd-online.com/Forums/ope...tml#post538568 #14

i m lost. I would like to implement the externalwallheatFluxtemperature boundar condition for incompressible flows . if someone could help me.
Thank you

regards,
Naresh Yathuru

[Tushar@cfd]

Originally Posted by Naresh yathuru

Hi gautam,

First of all thanks for your reply. In my case i dont know the flux. so i have to specify the conductivity of the solid, virtual wall thickness, and heat transfer coeffecient h of outside air ,and outside temperature Ta.
At this point i would like to give clear information about my case, I have a room assume one side of the room(right wall) is expossed to environment t= 260k .so in this case I had to use a boundary condition that is similar to convective boundary condition in fluent. that is it considers the virtual wall thickness and outside temperature and thermal conductivity of the solid, heat transfer coeffecient h outside.

i tried groovyBC but without any sucess. i have posted my groovyBC under this link already.

http://www.cfd-online.com/Forums/ope...tml#post538568 #14

i m lost. I would like to implement the externalwallheatFluxtemperature boundar condition for incompressible flows . if someone could help me.
Thank you

regards,
Naresh Yathuru

Dear Naresh,

Similar question was asked in the following post:

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

Since it was already answered, thats why FOAMer's did not comment your posts. Anyways,

-
Best Luck!

[gomsy1987]

Hi

As far I understood you want to implement convective HTC in your boundary. Let me tell you I am also struggling for that BC more than a month. I have seen many threads saying about groovyBC but I dont want to make it so complicate since I am a beginner in this field. I am looking for a simple way to implement it. And I feel there will be some BC already available in openFoam for implementing HTC which I am not finding till now.

The externalWallHeatFluxTemperature is one such BC but it is again limited to some thermophysical models. I tried to use it but end up with an error mentioned in my thread.

Once I will get it I will let you know.

[Naresh yathuru]

Hi,
Thank you tushar and gautam. It was so helpful.
http://www.cfd-online.com/Forums/ope...-transfer.html #2

That was what i expected. I m a also new to OpenFoam . It look similar to the code in externalwallheatflux boundary condition so i will test this and let you know

Gautam i would also work in implementing the externalwallheatflux boundary condition for incompressible flows sooner or later and let u know if i succeed.
Thank you

regards,
Naresh

[aero.rajat]

did any of you guys succeed in implementing the condition in incompressible solver? I am also stuck at exactly the same position like you.

[jai manik]

You can try adding the library of compressibleTurbulenceModels in the make file of your solver (as shown in the attached image file). Recompile your solver and run the case again. It should work.


-Jai