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Thermal expansion model.

Posted Mar 27, 2013, 10:05 p.m. EDT Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization, Studies & Solvers Version 4.3a 1 Reply

Myung Rae Cho
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I am trying to examine the stress distribution in a SiO2 film coated on a thick Si sample with a small Al bump on it, all heated to 600 K. I thought I built the model correctly, but a message that said relative error is greater than relative tolerance popped up after the computation. So I adjusted the relative tolerance value, and the result came out, but the resulting model seemed to be rotated around the axis a bit. I guess this is a problem concerning boundary condiciton or initial values. Can anyone tell me what may be the problem with my model. And also, I want to see the results displayed with arrows, not just color bands; do anyone know how to do this?

I would also appreciate if anyone of you explain how to build such thermal expansion model thoroughly.

Thank you.
1 Reply Last Post Mar 28, 2013, 3:08 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Mar 28, 2013, 3:08 a.m. EDT
Hi

that error message alo comes often out when one has not defined enough BC to get a unique solution

--
Good luck
Ivar
Hi that error message alo comes often out when one has not defined enough BC to get a unique solution -- Good luck Ivar

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