Comsol moving boundary with loss of mass

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SUMMARY

The discussion focuses on simulating a moving boundary with mass loss in COMSOL Multiphysics. The user seeks to model a plate with a central hole that expands over time based on a velocity equation dependent on stress. For scenarios involving shape changes due to applied stress, the Moving Mesh interface is recommended. In contrast, for changes due to material removal or addition, the Deformed Geometry interface should be utilized. Additional resources are provided for further clarification.

PREREQUISITES
  • Familiarity with COMSOL Multiphysics software
  • Understanding of the Moving Mesh interface
  • Knowledge of the Deformed Geometry interface
  • Basic principles of stress and strain in materials
NEXT STEPS
  • Explore the COMSOL Moving Mesh interface documentation
  • Research the Deformed Geometry interface in COMSOL
  • Study the principles of stress and strain in material science
  • Review COMSOL's knowledge base articles on mass loss simulations
USEFUL FOR

Engineers, researchers, and students working with COMSOL Multiphysics who are involved in simulations of moving boundaries and material behavior under stress conditions.

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I need some help!My problem is a problem of moving boundary with loss of mass... I started to use COMSOL and I need to simulate one plate with a hole on the center. And this hole is increasing with the time according to one equation (like a velocity, in m/s) which depend of the stress. Someone knows how to do this? Can I do this whit the moving mesh? Or I should use the DG?
Thank you!
 
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It is not clear to me what exactly you mean with mass loss here. If the structure is changing shape due to applied stress (->strain), use the Moving Mesh interface. If the structure is changing shape due to material removal/addition, use the Deformed Geometry interface. This link gives some more info:
http://www.comsol.com/support/knowledgebase/970/
regards
Niklas (COMSOL employee)
 
Last edited by a moderator:
This might help you in explanation.
 

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