Boundary condition for adiabatic walls on chtMultiRegion
 

Hi all,

I'm running the following case with chtMultiRegionSimpleFoam, with this set up.

• Two solid Regions
• same Material
• 2d Case
• all Walls set to zeroGradient except for empty patches
• one solid region with full heat Spource (10 W)
• the other region with a fixed T value on a patch

The case takes at least 140000(!!!) iteration to get to convergence.
Should it be related to the fact that on one region a Dirichlet condition is missing?
Probably the answer is yes as for the fact that if I set at least a patch on each region with a fixed value, solution converges quickly.
So, what is the right BC to set the patches in order to simulate the patches to be adiabatic?

Thanks a lot

PS: the case is downloadable at thie thread
https://www.cfd-online.com/Forums/op...tml#post662920

OF version 4.x on bluCFD-CORE 2016.1
Regards