There should be no problem with the boundary conditions, because the simulation I ran was just like any other simple simulation.
In the comparison of the full model and the simple model, I took the heat flux data received by the helical coil during the full model simulation. then I tried to simulate the simple model with the heat flux data. so you could say that in the full model and the simple model, the helical coil has approximately the same heat flux, so the temperature at the coil wall and outlet between the two models should have approximately the same value.
Then what other parts should I pay attention to besides the meshing?
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