Speeding up time-dependent solver
Posted Jan 13, 2021, 11:13 AM EST Electromagnetic Heating, Heat Transfer & Phase Change, System Requirements 1 Reply
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I want to simulate air convection generated by Joule Effect. Using an input source of 1 V (constant over all times except for t=0, where there's a quick rising phase from 0 to 1 in order to have consistent initial conditions), I can simulate pretty good results on a time window of one minute, with a CPU time of about a hour.
When I try to simulate larger timespans, the reciprocal of step size tend to grow more and more until COMSOL warns that a singularity is likely hit, and the simulation is inturrepted (see image attached).
How can I prevent this and at the same time increase time durations to hours/days with a reasonable CPU time running? I use an Intel Core(TM) i5-7500 CPU and 16 GB RAM. The model is rather simple and the figure above refers to a 2D model with a simple geometry ~29k DOF.