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How to use stress and displacement results from 1st stationary simulation as initial conditions for 2nd eigenfrequency simulation?
Posted Jul 13, 2024, 11:05 p.m. EDT Version 6.1 2 Replies
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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
Attachments:
- left displacement.PNG
- right displacement.PNG
- top displacement.PNG
- bottom displacement.PNG
- study 1 set up.PNG
- study 1 result.PNG
- periodicity x direction.PNG
- periodicity z direction.PNG
- study 2 setup.PNG
- study 2 set up 2.PNG
- Eigenfrequency results (Study 2).png
- an eigenmode of Study 2.PNG
- single eigenfrequency setup.PNG
- Eigenfrequency results (single study).png
- an eigenmode of single eigenfrequency study.PNG
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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.
-------------------Henrik Sönnerlind
COMSOL
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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