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Very ill-conditioned preconditioner

Posted Aug 2, 2014, 7:52 p.m. EDT RF & Microwave Engineering, Wave Optics Version 4.1 0 Replies

Mohammad Parvinnezhad Hokmabadi
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Hi everybody,
I am doing a simulation of a simple electromagnetic structure in Comsol 4.1, RF module.
It is a Si slab in air. It makes an error, immediately.
Here is the error:

Failed to find a solution for the initial parameter.
Very ill-conditioned preconditioner.
The relative residual is more than 1000 times larger than the relative tolerance.
Returned solution has not converged.

I also attached the structure.
I appreciate if somebody answers this issue.

Thanks,
Mohammad

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0 Replies Last Post Aug 2, 2014, 7:52 p.m. EDT
COMSOL Moderator

Hello Mohammad Parvinnezhad Hokmabadi

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