In order to ensure a reliable operation of electronic devices in a passenger car, its thermal situation is evaluated in a digital prototype. Of particular interest is to predict the time period, during which the electronic system embedded in the vehicle works within its optimal operating temperature range, in order to compare it with the vehicle specifications. In the present work, iterative coupling simulation strategies and numerical models to predict the temperature of the electronic equipment in a passenger car under time-dependent operating conditions and thermal loads have been developed and validated. The co-simulation strategies are investigated by means of two complex electronic systems embedded in a passenger car. The comparison with experimental results shows that the parallel discrete coupling strategy provides consistent temperature predictions within reasonable computation times in case of coupled problems for which the characteristic time for heat transport by convection is strongly dependent on the simulation time. As for the serial staggered coupling strategy, it is adapted to coupled problems, for which the characteristic time for convection is much smaller than the characteristic time for conduction. To predict the warm-up of an electronic system over several minutes, this strategy provides an efficient model generation and accurate temperature predictions within 1K.

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