Discussion Forum

Hi

in 2D you can "box" a region and refine locally, I do not believe this is possible in 3D (how to "box" in 3D?), I often add points and lines or even a sphere/box of interior boundaries to mesh the different boundaries and domains separately to get a better control on the mesh parameters. Then you have many parameters to change the mesh sizes and size gradients in COMSOL. It's worth to spend some time playing with these on simple examples

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Good luck
Ivar

Hi,

I'm trying to do the same thing using comsol 4.2a. My model runs fine if I use a built-in "Physics controlled mesh". But if I do right click under the Mesh node, go to "More operations" »» "Refine" and then I select some domains for refinement, I get the following error message:

"There is no mesh to refine"

although I have previously created a mesh in all domains.

Try using "Scale" option from mesh menu

Solved! Finally!

The problem was that I was refining a physics-oriented mesh directly. The right way is to change the sequence type from "Physics-oriented mesh" to "User-controlled mesh" and a mesh type will be automatically created (usually "Free triangular 1"). Then you may be able to refine specific domains without any problems.

This was the answer I received from the support service:

"(...) When you set your mesh to User Controlled you have to manually add a mesh
type. If you look at the attached screenshot you can see how I've added a
Free Triangular mesh.
Now you will not have the error message.(...)"

Thanks to all for the help.
Cheers.

You can apply the “Size” mesh feature to points in 3D