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Step function problem
Posted 2017年7月13日 GMT-4 04:14 Studies & Solvers Version 5.2a 0 Replies
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I am preheating a piece of composite materiel for 42 sec using a laser beam and then I stop the radiation flux and let the piece cool down by itself.
I'm modelising the processus using a 2D model on Comsol multiphysics by drawing a rectangle and applying on 1 edge a heat flux. The heat flux is therefore defined by a step function going from a value of 40 Kw/m2 to 0 at 42 sec.
The problem is when I draw a graph representing the tempererature evolution as a function of time at the middle point of this edge, I got an ascendant line that reach its maximum at 39sec (not at 42 sec as expected) !!
The probleme still happens even if I shut down the laser beam at 40sec, 41 sec.
And the surprising part is that when I shut down the laser at 37sec,38sec or 39sec , The piece will keep heating for 35 sec before starting to cool down !!
Please help
Hello Charbel Alhachach
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