[psosnows]

Hello Michael,

Originally Posted by miael

So this BC is the implementation of the third type of BC (other names I found for that are Robin-BC or Newton-BC).

I would say "yes and no".
Yes- it seems that this BC works like Robin boundary condition. One region has some non-uniform Robin condition, and the other has the mirror version of this BC.

No- can we use this BC? Here is my doublt: we fix some coupling BC, any BC (Dirichlet, Neumann, Robin, mirror-Robin). We solve first region, after that the second region. We get some fields, but... do those fields really represent the fields that we should acquire? Can we arbitrary split, for example, a heated rod into 100 random sections, "bind" them with this mirrored Robin BC, solve each of those 100 sections serially and still obtain the right heat distribution? Because this is what the solver does...
I have some doubts about that, and would be very happy to see some (any) literature regarding this subject.

Best,
Pawel

[miael]

Hello Pawel,

thank you for your reply. I have to think about your doubts!but you helped me a lot!

best wishes

Michael

[mirko]

Originally Posted by maddalena

Ok, let us go with pictures!
Here is an example of the case I would like to study. I know the volume heat generation of the solids A and B, but since I cannot impose the volume generation, I will use the heat flux between their surfaces. C does not have any heat flux and its temperature depends from A, B and fluids. What I want to know is the heat flux to C and the temperature of the whole system...
If I understood right, OF will manage the A-B coupling, if I impose a solidWallHeatFluxTemperature with a properly chosen q (gradient 0 as suggested in another post). But what about the B-C interface?
Cheers,

mad

Maddalena,

Could you please post the files in the 0, system & constant directories for this problem (if you still have them)?

Thank you,

Mirko

[maddalena]

Hi Mirko,

Originally Posted by mirko

Could you please post the files in the 0, system & constant directories for this problem (if you still have them)?

in the meanwhile, I changed approach, thus I cannot help on the setup of your case neither give you those files. If you want to take a look, the thread: http://www.cfd-online.com/Forums/ope...egionfoam.html explains what I have learnt on chtMultiRegionFoam.
Enjoy

mad