When simulating multiphysical problems, the different time scales of the physical aspects make it computationally inefficient to solve the problem as one monolithically coupled system. Electromagnetic processes, for example, happen at significantly higher time rates than the thermal heating induced by the electric losses. One approach to efficiently solve this coupled multirate system is to apply Waveform Relaxation and compute the electromagnetic and thermal problems with different time rates iteratively in a decoupled way. This work explores the possibilities to couple electromagnetic and thermal simulations of a 2D FEM transformer in Matlab with preCICE. The heat generated by the magnetic eddy-current losses influences the temperature dependent conductivity of the electric circuit, which again influences the electric losses generating the heat. This two-way coupling is solved with time adaptive Waveform Relaxation and independent blackbox solvers for the time-stepping within the two subproblems.
-- 13:45-14:30: preECO talk