Understanding boundary conditions for architectural simulation

Dear Juan,

  1. Did you read this? : How to Set the Right Thermal Wall Conditions in CHT | SimScale.
  2. Before doing this simulation, I strongly advise carrying out a non-dimensional mass and energy balance study. What is the expected temperature at the outlet?
  3. I think the residuals are a bit too high. I am not sure the simulation is converged enough. But before going through this, it is important to perform the energy balance.
  4. If you have a natural convection outlet (Natural Convection Inlet/Outlet | Boundary Conditions | SimScale) you are freely allowing the fluid to enter or leave the domain. I think this condition is not working as you do not have set a physical outlet. As you only have one inlet, I suggest you use a zeroGradient outlet boundary. This should make the solution work fluid-wise.
  5. Take a look at the velocity boundary field. Do you think it is realistic?
    . Clearly, this confirms what is stated in #4.
  6. Before moving into a CHT, carry out a cold-flow analysis and verify your mesh and your boundaries are working well.

So make at least #2 and especially #4 and let me know what happens.

I hope this helps,

Jairo