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heating an object, then cool and then reheat , step function
Posted 05.10.2011, 01:33 GMT-4 Version 4.0a 3 Replies
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I wanted to study the behavior of the von Mises stress that will developed in a spheroidal object subjected to the following conditions.
time: 0 --> 3 mins ----- heating at constant temperature 45 C
time: 3 --> 4 mins ----- cooling at constant 15 C
time: 4 -->10 mins ----- reheating at 45 C
I am using version 4.0a for the coupled thermal diffusion and structural mechanics to study the temperature distribution and mechanical deformation. But I do not have an idea on how to put up the step function on the temperature settings on the conditions that I wanted to.
The step function in the under the Global Definitions seems do not have temperature settings.
Is there somebody out there who can give me some hints on how to properly do this.
I'll appreciate much for your help.
Thank you.
Jonathan
Hello Jonathan Perez
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I have given it up. I was not able to find a solution to that. Instead, I created an equation using SOLVER function in EXCEL. From the equation that i was able to developed from the SOLVER function in EXCEL was imported/copied to COMSOL so it would create a similar condition.
Yet, i was not able to get the result that I expected.
But you can try that one. That method might work for you.
Regards,
Jonathan
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did you try to define a rectangular pulse (definition functions) and shape it to modulate your heat flux and the "h" for convecting cooling ?. It should be straightforward in COMSOL with a time stepping solver you can write any formula in all the fields (provided you do not make circular references though ...)
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Good luck
Ivar