[boffin5]

Hi community,


My interest in CFD is as a vehicle designer; to do my work I need 2 tools: simpleFoam to calculate lift and drag, and chtMultiRegionFoam to analyze heat exchanger integration. Regarding the first tool, I have a good handle on it - for the second, not so much.


Since November (!) I have been struggling with chtMultiRegionFoam as applied to a porous zone heat exchanger in a lofted body case, and have received a lot of advice, suggestions and actual time-spent-aid from generous people on this forum. I have gone through the tutorials, and carried over applicable material. Still no luck.
The big problem is failure accompanied by the "...exceeded maximum number of iterations..." message. It occurs immediately at time step 2. This could be a BC problem, or something more fundamental. I hate to ask yet again for help, but if anyone has time on their hands, my case can be found in this dropbox link:


https://www.dropbox.com/sh/fdbqckqdb...tC0oXhYMa?dl=0


As a sanity check to see if the mesh was at fault, I removed the heat exchanger and ran the case as a just a body with an empty duct, and it ran successfully. For reference, this case can be found in this dropbox link:


https://www.dropbox.com/sh/ukpv6cl3m...j7Thd3RPa?dl=0


All this notwithstanding, I will keep trying to make my case run, and will always be grateful for the help I have received.


boffin5