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Optimization with the Eigenfrequency Study Step
Posted 06.04.2021, 09:57 GMT-4 0 Replies
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I am trying to perform an optimization within the Eigenfrequency study step to optimize the Q/V (Quality factor/mode volume) ratio for a specific mode of a Photonic Crystal.
It seems to run successfully for gradient-free optimization algorithms like the Nelder-Mead Method but I would like to run an optimization for multiple control variables and a shape optimization (for the shape of the holes in the crystal) using the free shape domain (and free shape boundary).
When I change the optimization algorithm to a derivative-based one, like MMA, I cannot select the 'eigenfrequency' study step inside the 'evaluate for' parts of the optimization study (it just says 'none'). Additionally, when using free shape domain/free shape boundary in a shape optimization, the gradient-free solvers do not seem to be compatible with this.
The questions I have are:
1) Is the Eigenfrequency Study step not compatible with derivative-based Optimization algorithms?
2) Is shape optimization, with the free shape domain/free shape boundary, only compatible with derivative based solvers?
3) Is there/are there ways to perform the shape optimization (using free shape domain etc) and gradient based optimization of the Q/V ratio (which requires the eigenfrequency) in COMSOL?
Many thanks,
Angus
Hello Angus C
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