[dinonettis]

Hi all,

I'm having a look at the code of the cht solver conjugateHeatFOAM. I was expecting to find something similar to what has been done for chtMultiRegionFOAM, I mean in terms of BCs like: solidWallMixedTemperature or solidWallMixedHeatFlux. My aim is to understand which kind of info is send/received by the fluid or the solid, but from what I've seen, there is only this regionCouple BC.
Any clarification is well accepted!!
thanks in advance

[henrik]

Dear Leonardo,

the boundary conditions CANNOT be the same as in chtMultiRegionFoam due to the nature of coupling (implicit) and regionCouplingFvPatchField is the place to look:

$FOAM_SRC/finiteVolume/lnInclude/regionCoupleFvPatchField.C

Best Regards,

Henrik

[dinonettis]

Dear Henrik,

what do you mean exactly by "implicit coupling"?? I'm not sure "implicit" has the common meaning used in CFD since we are in a coupling procedure now.
ps: I found several files with the name you suggested, although in other folders, is there a reason for that??
thanks for you availability

Dino

[henrik]

Dear Leonardo,

sorry, only one file here:

galerius*253-> find $FOAM_SRC -name "regionCoupleFvPatchField.C"
/home/foam/OpenFOAM/OpenFOAM-1.5-dev/src/finiteVolume/lnInclude/regionCoupleFvPatchField.C
/home/foam/OpenFOAM/OpenFOAM-1.5-dev/src/finiteVolume/fields/fvPatchFields/constraint/regionCouple/regionCoupleFvPatchField.C

Here, implicit means that we construct a combined matrix for both regions (fluid and solid) rather than building two matrices and coupling (explicitly) through the boundary conditions.

Henrik

[dinonettis]

ok,

I started looking at the code few days ago, so I didn't know that all the files are duplicated in the lnInclude folder.
However thanks for your help.

Dino

[benk]

So why use conjugateHeatFoam over chtMultiRegionFoam? I'm guessing the implicit method that conjugateHeatFoam uses is supposed to be faster?

PS: I've been having problems with conjugateHeatFoam:
http://www.cfd-online.com/Forums/ope...tml#post251473

[dinonettis]

In my case I would use chtMultiRegionFoam because in other softwares I worked with, this kind of approach seems to be more reliable, as I can see from your results as well.
However I need to simulate an incompressible flow therefore conjugateHeatFOAM is the only chance I have in OF (apart from developing my own chtMultiRegion for incompressible !!!)

Dino

[dinonettis]

ps: somebody knows why chtMultiRegionFOAM has been developed only for compressible flows?? before trying to modify it I would like to know if there is a serious problem in such work!!