Problem with tdp of capacitor and IC

Using SimScale Thermal
1

hi i am having a pcb with electronic component i have tdp of capacitor very less and getting a temperature very high and on the otherhand IC with TDP of 45 watt getting a temperature very low. Please help me with this here is my project link
pcb update | SimScale Workbench

2

Hi @lh3g5p,

Thanks for posting your question!
I have no reason to believe the results are not converged and physical. The velocity near the warmest capacitor is the smallest one, so that makes sense.

Screen Shot 2023-08-21 at 11.29.11
Screen Shot 2023-08-21 at 11.29.111914×885 156 KB

what’s more concerning to me is the 75 m/s air somewhere. If you want to be positive of results:

  • Remesh with gap refinement factor at 0.5, 0.75, or even 1. This will put more mesh in the small gaps, including in the heat sink fin gaps;
  • Add surface refinement result controls: integral at inlet to understand flow rate, area average at outlet to ensure temperature is no longer rising vs iteration count;
  • Add area average result controls to some/the most important heat load bodies. Ensure they’re converged.

You can also do a hand calculation to check energy balance in the system. MdotC_pDeltaT.
Mdot via density and integral, C_p is specific heat of fluid, measure delta T in C from inlet to outlet. You’ll get J/s which is watts. compare to total heat load in the box.

Hope this helps.

best,

3

gonclave can you solve this cfd please i am also not understanding. please solve do the simulation and also that hand calculation it will be more helpful for us