On 2/9/23 11:28, Deepika Kushwah wrote:
**

I have changed the default tolerance as you suggested but the problem is still persisting. In the coarse meshing, there are only 4 points connected between the two triangulations and after refinement there is still the same connection.
How can we increase the connecting points?

I see the problem now. If you count how many points there are on the circle from the inner mesh and the outer mesh, the number is different. These meshes *can't* be merged as you want. Merging meshes can only work if you have the same number of vertices coming together at the interface where you want to merge the meshes.

Best
 W.

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Wolfgang Bangerth          email:                 bange...@colostate.edu
                           www: http://www.math.colostate.edu/~bangerth/

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