Here's a tutorial video on how a thermal analysis (Ansys) is done on a PCB with a CPU and 4 memory chips. The main heat sources are the internal heat generation within the chips. All modes of heat transfer are considered and radiation is considered to be taking place within an open enclosure.
Initially, a steady state thermal analysis is done and then a heat sink design is proposed and analyzed as a solution to overheating. Finally, a transient analysis is done to find the time taken to cool down from a certain temperature.
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