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How to smooth sharp gradient across element

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Hello all,

I am running a transient heat conduction simulation where the heat source is a function of a variable W, where W is solved using the Domain ODE. The condition for the heat source is such that"

Q > 0 if W<=1
Q<0 if W > 1

I tried implementing it by keying in:

Q*(W<=1)

into my heat source term but I couldn't get convergence. I believe this may be due to the sharp change in Q over the element so I tried smoothing it using a piecewise function but that doesn't help either.

Is there any way to overcome this? In FeNics, an open source software, it is possible to project onto the elements such that a C0 continuity is prescribed to allow for the jump in Q. Is such a thing possible with COMSOL?


Best wishes,

Ean Hin

0 Replies Last Post 2015年6月11日 GMT-4 00:40
COMSOL Moderator

Hello EH Ooi

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