I've run into an insurmountable problem when I tried to run a flow simulation.
The situation is simple - air at 293 K goes into one channel, air at 400 K goes into another channel, and some helical elements mix the two air flows together, as shown in the following image:
However, whenever I would try to run the simulation, I would get an error message saying (I quote):
Fluid Subdomain 1 - Rebuild Errors: Faces of this feature belong to different regions.
Not sure exactly what went wrong - I've gone to instructional videos on Youtube and followed the instructions down to the letter, and I'm still getting this error.
Will appreciate any help here. Thanks.