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Difference operation: All objects vanish
Posted Jan 9, 2012, 6:39 a.m. EST 1 Reply
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Hi, I have a problem. When I try to use difference on two groups of spheres all involved spheres vanish. I used union on both groups before the difference operation is applied to them and the result stayed the same. When I use the difference on only few of the spheres, especially if it is never the case that two spheres touch the same sphere that should be subtracted, everything works well.
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1 Reply Last Post Jan 9, 2012, 7:12 a.m. EST
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Posted:
1 decade ago
Hi
Indeed COMSOL seems to have problems with boolean differences of several intersecting spheres. I would suggest that you send this example to support I do not believe we users can propose anything much better.
I mostly use an external CAD programme for my geometry, particularly for complex ones, and spheres, like torus are "complex" topologies, COMSOL is first of all a FEM tool, not really a CAD tool ;)
By the way, you have also the Transformation Array operation (or copy with a set {} of coordinates) for your sphere generation
--
Good luck
Ivar
Indeed COMSOL seems to have problems with boolean differences of several intersecting spheres. I would suggest that you send this example to support I do not believe we users can propose anything much better.
I mostly use an external CAD programme for my geometry, particularly for complex ones, and spheres, like torus are "complex" topologies, COMSOL is first of all a FEM tool, not really a CAD tool ;)
By the way, you have also the Transformation Array operation (or copy with a set {} of coordinates) for your sphere generation
--
Good luck
Ivar