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Patrick that does not sound unusual since you are solving momentum, velocity, pressure and now heat transfer (but perhaps you're doing transient, too?). CFD is a big deal on any system. A way to get it going is to just do the flow (no heat), coarse mesh and suppress all but one inlet and one outlet. You can set an initial velocity to 'help' the equations solve faster. Then when you get a solution, just open another inlet, run again (using answers from last run to pick up where it left off), then add some outlets, then add some heat...take baby steps and it will help.