How to use stress and displacement results from 1st stationary simulation as initial conditions for 2nd eigenfrequency simulation?

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Dear All,

I am trying to define the dispersion curves of a periodic unit cell in COMSOL Multiphysics with prescribed displacements. I am using two separate studies:

  • Study 1: Stationary, with prescribed displacements on the four edges of the unit cell
  • Study 2: Eigenfrequency.

I intend to use the results of Study 1 as initial conditions for Study 2. I also conducted a different eigenfrequency study of the same unit cell, and the dispersion curves from Study 2 and this separate study are similar. This suggests that the results from Study 1 may not have been used as initial conditions for Study 2.

The following figures illustrate my setup. Could I be missing any setup errors?

Thank you in advance



2 Replies Last Post Jul 16, 2024, 2:32 a.m. EDT
Henrik Sönnerlind COMSOL Employee

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Posted: 4 months ago Jul 15, 2024, 6:24 a.m. EDT

It looks like you have forgotten to include geometric nonlinearity in the eigenfrequency step. That is necessary in order to get a nonzero linearization point.

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Henrik Sönnerlind
COMSOL
It looks like you have forgotten to include geometric nonlinearity in the eigenfrequency step. That is necessary in order to get a nonzero linearization point.

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Posted: 4 months ago Jul 16, 2024, 2:32 a.m. EDT

It looks like you have forgotten to include geometric nonlinearity in the eigenfrequency step. That is necessary in order to get a nonzero linearization point.

Dear Mr. Mr. Henrik Sönnerlind,

I forgot to include the geometric nonlinearity in the eigenfrequency step. Thank you so much for your valuable time and comments.

Best wishes, Binh

>It looks like you have forgotten to include geometric nonlinearity in the eigenfrequency step. That is necessary in order to get a nonzero linearization point. Dear Mr. Mr. Henrik Sönnerlind, I forgot to include the geometric nonlinearity in the eigenfrequency step. Thank you so much for your valuable time and comments. Best wishes, Binh

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