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Time Stepping for Nanosecond Pulsed Laser Heating
Posted 28 lug 2023, 13:16 GMT-4 Heat Transfer, Studies & Solvers Version 6.1 0 Replies
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The general trend the peak surface temperatures during each laser pulse has some odd spikes
Background:
The pulsed nansecond laser (simplified as a surface heat source) is applied to a thin plate. The frontside of the plate is subjected to a rectangluar pulse flux source. The pulse duration is a few nanoseconds, wheras the pulse repetition rate is 1Hz. The other sides are insulated.
The objective is to simulate a couple hundred laser pulses. Due to short laser pulses relative to frequency, two time stepping approaches were examined. 1. Event interface is used to trigger explicit event for each laser pulse. 2. Time steps were set to intermediate and ranges were specified such that shorter time steps are used during the laser pulse, whereas longer time steps are used during the cooldown periods.
Question:
It appears that the time stepping approach (events, ranges, or both) affects the peak surface temperatures during each pulse (see side by side comparison). Why is this?
Moreover, it appears that refining the time stepping (applying both approaches) reduces some of the "randomness" in the peaks, however 2 "bumps" still persist. Why is this?
Hello anonymous
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