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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Finding mesh volumes for volume integral

Posted 2014年6月19日 GMT+8 09:35 Mesh, Studies & Solvers Version 4.4 2 Replies

krc
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Hi all,

I have calculated an energy density (per volume). Now, I am trying to find total energy by integrating this energy density. I have a list of (x, y, z) coordinates and each point's energy density. I know that in the triangular mesh, the volumes are not always equal, so I'd like to get a list of volumes corresponding to the points, so that I can multiply by the respective densities and add them to integrate. I am using 4.4, and I have looked under mesh statistics, but I haven't found what I need.

Does anyone know a way that I can do this, or an alternative method for calculating this integral? Thanks!
2 Replies Last Post 2014年6月19日 GMT+8 12:04
Robert Koslover Certified Consultant
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Posted: 1 decade ago 2014年6月19日 GMT+8 11:41
Here's a better way: You can integrate energy density (or almost anything else that Comsol Multiphysics evaluates) using the built in tools to do that. For example, after running your model, look in the Model Builder, under Results, and then right-click Derived Values. Select Integration. Then select either volume, surface, or line integration. Choose the expression you want to integrate. Then click Evaluate. (Note: You can even change the integration settings too, if you like.)
Here's a better way: You can integrate energy density (or almost anything else that Comsol Multiphysics evaluates) using the built in tools to do that. For example, after running your model, look in the Model Builder, under Results, and then right-click Derived Values. Select Integration. Then select either volume, surface, or line integration. Choose the expression you want to integrate. Then click Evaluate. (Note: You can even change the integration settings too, if you like.)
krc
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Posted: 1 decade ago 2014年6月19日 GMT+8 12:04
Wonderful, works perfectly. I should have figured this out. Thanks so much!
Wonderful, works perfectly. I should have figured this out. Thanks so much!

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