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meshing
Posted 21 set 2010, 00:07 GMT-4 2 Replies
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Hi,
will you please kindly help me, what type of meshing is suitable for Shunt switch design, which has fixed- fixed cantilever beam (switch) of inverted U shape above the signal conductor, both are based on same boundry of air domain which is enclosing whole switch and signal conductor.
will you please kindly help me, what type of meshing is suitable for Shunt switch design, which has fixed- fixed cantilever beam (switch) of inverted U shape above the signal conductor, both are based on same boundry of air domain which is enclosing whole switch and signal conductor.
2 Replies Last Post 21 set 2010, 23:53 GMT-4
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Posted:
1 decade ago
Hi
Mesh type and density is a delicate issue: you need enough elements to correctly model all gradiets in your model, that the element quality is correct (for me about >5%) and still leave enough ram free to solve and run the problem on your computer.
I mostly start with default mesh (triangles in 2D or teths in 3D), but if you have many rectangular blocs then quad or block meshng based on mapped meshes are often easy to generate. Mixing teth and blocks is not always possible, then you need to split your blocks first. For long parts you have the sweep mesh option, for axial symmetry in 3D the revolve option.
Note that in 2D axi, any mmesh touching the 2D axis must be a quad (triangles/thehs are not allowed).
One of the points in COMSOl is that it applies the shape function (higher order elements) to he mesh elements independently (in other tool these are often linked). The default is 2nd order shape elements in COMSOL, but it reverts to 1st order if the mesh quaity is too low nad there might be "inverted elements"
Best way: try it out the simplest way, then refine you mesh a few times to check that the results do not change too much
--
Good luck
Ivar
Mesh type and density is a delicate issue: you need enough elements to correctly model all gradiets in your model, that the element quality is correct (for me about >5%) and still leave enough ram free to solve and run the problem on your computer.
I mostly start with default mesh (triangles in 2D or teths in 3D), but if you have many rectangular blocs then quad or block meshng based on mapped meshes are often easy to generate. Mixing teth and blocks is not always possible, then you need to split your blocks first. For long parts you have the sweep mesh option, for axial symmetry in 3D the revolve option.
Note that in 2D axi, any mmesh touching the 2D axis must be a quad (triangles/thehs are not allowed).
One of the points in COMSOl is that it applies the shape function (higher order elements) to he mesh elements independently (in other tool these are often linked). The default is 2nd order shape elements in COMSOL, but it reverts to 1st order if the mesh quaity is too low nad there might be "inverted elements"
Best way: try it out the simplest way, then refine you mesh a few times to check that the results do not change too much
--
Good luck
Ivar
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Posted:
1 decade ago
Thank you....