PFA the file I am using for the simulation.
wire_trial.ldev (6.0 MB)
I made some changes so that it resembles our working model. I have changed the Thermal and Conducting properties of the wire element(Conductivity values, Work function etc.). I also changed the geometries of the electrodes and the wire element. In my case, the length of the wire element is 400 micron. And the material surrounding the wire has been changed from ‘Glass’ to ‘Air’. Also, the wire is placed on a block of material which is a conductor of heat.
Now, if I run the simulation it is okay for the case where there is no dependence of conductivity on temperature. But when I implement the temperature dependence of conductivity(as per the model in the file, only for the wire) the simulation diverges.
The simulation does not diverge if I decrease the ‘alpha’ value(for eg.,9e-7) or decrease the voltage applied across the wire. But there seems to be a point where the simulation diverges for the cases with temperature dependence of conductivity even if it is okay for the constant conductivity case(same voltage applied across the wire). I believe changing some simulation parameters should take care of this but I could not exactly figure out which. It would be great if you could help me in getting this solved.
Also, when the simulation runs okay, I do not understand why the wire and the block on which it is placed, all have the same temperature and there is no gradient.
There is one more case where the simulation diverges even if the conductivity is constant. The boundaries of the simulation region in the attached file coincide with the electrode(named ‘right’) along the x-axis. The simulation runs okay for this.
If I increase the size of the simulation region(or decrease the size of the electrode) the simulation diverges.
This does not happen if the surrounding material is ‘Glass’ instead of ‘Air’.
Thanks in advance!