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Guidance for Model Methods

Posted 13 nov 2024, 11:37 GMT-5 API, Structural Mechanics, Modeling Workflow Version 6.2 3 Replies

Aida Bouaziz
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Hello COMSOL community,

I am a PhD student working on nonlinear methods in structural mechanics. I recently discovered that COMSOL offers applications that can be shared, and I am interested in learning how to create a model method to automate my model. If anyone could provide guidance or point me to relevant blog posts or resources on model methods, it would be greatly appreciated.

Thank you!

3 Replies Last Post 19 nov 2024, 04:27 GMT-5
Jeff Hiller COMSOL Employee

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Posted: 6 months ago 13 nov 2024, 13:43 GMT-5

Hello Aida,

As a starting point, you will find a number of resources on model methods by googling "COMSOL model method" or similar. However, to avoid the risk of sending you down the wrong path, it would be a good idea if you could share what exactly makes you think you need to use a model method. Perhaps there is a different and better approach to what you are trying to achieve.

Best regars,

Jeff

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Jeff Hiller
Hello Aida, As a starting point, you will find a number of resources on model methods by googling "COMSOL model method" or similar. However, to avoid the risk of sending you down the wrong path, it would be a good idea if you could share what exactly makes you think you need to use a model method. Perhaps there is a different and better approach to what you are trying to achieve. Best regars, Jeff
Aida Bouaziz
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Posted: 6 months ago 14 nov 2024, 06:45 GMT-5

Hello Mr. Jeff,

I am working on solving a nonlinear equation using the phase field approach with the arc-length method. I have implemented the phase field equation in the PDE coefficient form, but detecting displacement control with small steps is challenging in a time-dependent study. So, I think the only remaining option is to try coding the arc-length method.

Hello Mr. Jeff, I am working on solving a nonlinear equation using the phase field approach with the arc-length method. I have implemented the phase field equation in the PDE coefficient form, but detecting displacement control with small steps is challenging in a time-dependent study. So, I think the only remaining option is to try coding the arc-length method.
Adam Wahlsten COMSOL Employee

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Posted: 6 months ago 19 nov 2024, 04:27 GMT-5

Hello Aida,

The problem shown in your attachment appears to exhibit stable crack propagation, which should be possible to solve without the need for an arclength method. Please contact COMSOL support for further assistance.

You can also have a look at the following model examples for phase field fracture: https://www.comsol.com/model/brittle-fracture-of-a-holed-plate-89321 https://www.comsol.com/model/a-phase-field-model-of-fracture-in-thermoelastic-solids-120931

Best regards,
Adam Wahlsten
COMSOL

Hello Aida, The problem shown in your attachment appears to exhibit stable crack propagation, which should be possible to solve without the need for an arclength method. Please contact COMSOL support for further assistance. You can also have a look at the following model examples for phase field fracture: https://www.comsol.com/model/brittle-fracture-of-a-holed-plate-89321 https://www.comsol.com/model/a-phase-field-model-of-fracture-in-thermoelastic-solids-120931 Best regards, Adam Wahlsten COMSOL

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