Why do I get very different results when I run a Transient Thermal analysis as compared to the results I get with Steady State Thermal analysis?
A steady-state thermal analysis is a not a function of actual time. The specified solution time is just a numerical counter. A steady-state thermal analysis calculates the temperature distribution after thermal equilibrium is achieved (steady-state conditions). Thus, the final calculated temperature distribution from a steady-state thermal analysis is not affected by changing the solution time.
A transient thermal analysis is a function of actual time. The last result set for a transient thermal solution may not represent steady-state conditions. If a transient thermal analysis is run for different solution times, the calculated temperature distributions from the last result will be different if thermal equilibrium has not been achieved. To achieve thermal equilibrium, it may be necessary to increase the solution time.
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