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How can I modify equations of a built-in physics model ?

Posted Mar 21, 2016, 10:31 a.m. EDT Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 5.2 2 Replies

Pierre Lhéritier
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Hello,

I am working on a piezoelectric device and I would like COMSOL to take into account the electrostrictive effect.
I know that it's possible to build your own physics but here I just need to add a single term to one equation.
So I'm looking for an option in a menu, or a .mphphb file that I could modify; but so far I haven't found it.

Do I need to rebuild the Solid mechanics physics? Can I add an equation that override the one COMSOL currently using ?

I really appreciate any help you can provide.

Thank you,

Pierre
2 Replies Last Post Mar 23, 2016, 11:21 a.m. EDT
Henrik Sönnerlind COMSOL Employee

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Posted: 8 years ago Mar 23, 2016, 4:08 a.m. EDT
Hi,

There are many different ways in which you can modify the physics. Some examples:

For your specific problem, you can enter an extra strain contribution expression in the Initial Stress/Strain node.

A more advanced option is to add your own code, using an External Strain node.

Regards,
Henrik
Hi, There are many different ways in which you can modify the physics. Some examples: For your specific problem, you can enter an extra strain contribution expression in the Initial Stress/Strain node. A more advanced option is to add your own code, using an External Strain node. Regards, Henrik
Pierre Lhéritier
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Posted: 8 years ago Mar 23, 2016, 11:21 a.m. EDT
Thank you for your help,

Regards,
Pierre
Thank you for your help, Regards, Pierre

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