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Error with mesh change

Posted 31.08.2010, 15:45 GMT-4 1 Reply

Ricardo Amigo
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I made a simple eigenfrequency study with a beam using a Free Tetrahedral mesh and it worked fine.

But, when I change the mesh type to Mapped and define the size of elements to 5mm, I received an error saying that my Mass Matrix is zero.

Why? I'm attaching my file.

Thanks a lot.

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1 Reply Last Post 14.04.2013, 17:17 GMT-4
COMSOL Moderator

Hello Ricardo Amigo

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Vahid Babakeshizadeh
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Posted: 1 decade ago 14.04.2013, 17:17 GMT-4
Hello Ricardo

This problem arises when you have a model with sharp edges. Try filing your edges with reasonable fillet radii. (= Draw a rectangle with filed edges; extrude it to make a block.)

Then apply a mapped mesh to one end face of your block and sweep that mesh along the block.

Problem will be resolved.

Have fun!
Hello Ricardo This problem arises when you have a model with sharp edges. Try filing your edges with reasonable fillet radii. (= Draw a rectangle with filed edges; extrude it to make a block.) Then apply a mapped mesh to one end face of your block and sweep that mesh along the block. Problem will be resolved. Have fun!

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