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Eigenvalue missing imaginary part
Posted 13 giu 2016, 22:26 GMT-4 Version 3.5a, Version 5.1 0 Replies
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I am trying to compute the Q factor of the whispering gallery mode in a silica sphere (10 um in diameter) with COMSOL 5.1. I am using weak form PED physics, and searching for eigenvalues. The Q factor is defined as Real(Eigenvalue)/(2*Imag(Eigenvalue)), the resulting surface plot makes sense but the related eigenvalue only gets real part.
What is really strange is that when build the model exactly the same with COMSOL 3.5, the eigenvalue comes with reasonable imaginary part . But when I run the model with COMSOL 5.1, again no imaginary part.
So what is going on there?
Thank you.
Hello Yingchun Qin
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