problems with electro-thermal simulation
Posted: 11 Oct 2020, 23:58
Hi all,
I'm trying to setup a steady state simulation to understand the raise in temperature of a trace on a pcb.
The starting model is very simple, just a small PCB with a straight trace (20mm long). All is immersed in air.
Dimensions are ok, I've checked this by comparing the analytical solution of trace resistance with that of stat current solver.
The problem is that I can't figure out why I get an increase of temperature of 156 deg C in the trace with only 0.5W of Joule losses. Not good...
Joule losses are correct (again matching with theoretical values) so the only place where the problem might be is the heat solver. I've followed the test cases and I've already fixed several bugs that I've made building the sif file but I reached "saturation" and can't see any further .
Perhaps I'm losing something with thermal BC? Still it doesn't explain a raise in temperature so high
Any pious soul available to have a look at the problem?
I attach an archive with the following files:
.sif
.step
mesh
ELMERSOLVER_STARTINFO
Thanks,
Marco
I'm trying to setup a steady state simulation to understand the raise in temperature of a trace on a pcb.
The starting model is very simple, just a small PCB with a straight trace (20mm long). All is immersed in air.
Dimensions are ok, I've checked this by comparing the analytical solution of trace resistance with that of stat current solver.
The problem is that I can't figure out why I get an increase of temperature of 156 deg C in the trace with only 0.5W of Joule losses. Not good...
Joule losses are correct (again matching with theoretical values) so the only place where the problem might be is the heat solver. I've followed the test cases and I've already fixed several bugs that I've made building the sif file but I reached "saturation" and can't see any further .
Perhaps I'm losing something with thermal BC? Still it doesn't explain a raise in temperature so high
Any pious soul available to have a look at the problem?
I attach an archive with the following files:
.sif
.step
mesh
ELMERSOLVER_STARTINFO
Thanks,
Marco