It seems like the reverse flow is quite significant. The negative mass flow rate at the coolant pressure inlet suggests that air is exiting at the inlet, while the positive mass flow rate at the coolant pressure outlet indicates air entering at the outlet. This indicates that hot air is stuck in the system, unable to leave, while cool air isn't entering.
I suspect there might be an issue with the design, geometry, or boundary condition setup. Do you have any suggestions on how to address this?
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