[DamR]

I am trying to run a transient simulation with coupled fluid flow and heat transfer. When running the simulation for a couple of minutes the temp inside was the same as the inlet temp and no difference at any location. I figured the initialization might be wrong and set it to a temperature much lower than the inlet temp. Now the energy equation residuals decrease rapidly and plateau while the continuity and velocity residuals gradually decrease. Is this fine or are there any more checks to ensure I have achieved convergence. Also, is my logic about the solution initialization right or flawed?

[kaeran]

Hello DamR,

I would suggest you to run a steady state simulation in forehand and then run the transient simulation. By this way you could input the converged initialized values or else try patch input in Solution Initialization tab to give your initial temperature or whatever it is.

But the former method is more reliable and robust.