"The only constant is change." This quote is attributed to the ancient Greek philosopher Heraclitus, and it is as true of engineering simulation as it is of life. Every situation we wish to simulate is in reality a time-varying situation, whether on the macro-time scale of days or weeks, or on the micro-time scales of milliseconds at which turbulence operates. Yet the vast majority of engineering simulations, including thermal simulations of electronics, are performed as steady situations. Why can we do this? When is steady-state a legitimate assumption?
This webcast examines the meaning of time scales in physical systems and the implications to electronics cooling simulations. Both flow and thermal time scales will be demonstrated through sample simulations along with foundational calculations that help us understand and predict transient situations. Also, a unique co-simulation transient approach will be shown as a method of addressing problems with dramatically different flow and thermal time scales.