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Joule heating simulation problem

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Hi
I am doing joule heating simulation for a thin surface to generate high temperature. I applied 120V to a thin film but the obtained temperature was not high enough. I found that the temperature definition in boundary conditions is very important while without that the problem was not converged. Also applying the temperature to different surfaces causes different results. I am not sure how I should define the boundary conditions to get high enough temperature on the surface of thin film with the voltage of 120V.
Regarding the attached file, does anybody have any idea?

Regards,
Elham

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