My Comsol version have the followings modules: AC/DC (Electric currents and Electrostatic) and Structural mechanics ( Solid mechanics only), so I would like to build a ferroelectric capacitor or piezoelectric capacitor (parallel plates) with one of them plate fixed and the aim of simulation is calculate the displacement in the other plate. My question is: How can I do to create the right physics with the modules included in my license?
Hallo,
As the name implies, Comsol Multiphysics is built around coupling different physics easily with using cou0pling operators or manual coupling of variables using definitions. All depends on the version of comsol you are using. The latest version 5.2 allows easy coupling and intuitive interface.
Regarding your problem, your model can be calculated using the structural mechanics, electric field in combination to moving mesh interface. (Please follow the discussion in this thread: http://www.comsol.com/community/forums/general/thread/34308/).
So the electric field between the capacitor plate causes a force that can be used to describe the displacement of the plate by defining a force in solid mechanics toward the opposite plate. Later, the moving mesh ALE physics is used to couple the solution of the solid physics. A fully coupled solver is then used while enabling Automatic remeshing in the study.
I hope that helps.
Regards,
Zaid
Hi Zaid
Thank you for your answer, What interface is using Comsol to couple two physics?. I am working in Comsol 5.1
Hallo,
I don't believe there is an exact interface for the coupling. I did that once manually without the need of interface. All what you should do is to solve the physics all together and use the correct dependent variable names and equation to calculate the electomagnetic attraction force for the solid mechanics module and the generated displacement in the moving mesh interface.
In addition, i advise you to follow the model examples presented in:
http://www.comsol.com/model/pull-in-voltage-for-a-biased-resonator-3d-11748
http://www.comsol.com/model/pull-in-of-an-rf-mems-switch-16379
http://www.comsol.com/model/electrostatically-actuated-cantilever-444
You require the MEMS module to open the files though.
Good luck,
Zaid
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