Select Mesh->Reset mesh data to reset all mesh sizes introduced previously.
A window appears advising that all the mesh information is going to be erased. Press Ok.
Set the Default Values in the Meshing branches of the Preferences window.
Set the Skip entities automatically option (Preferences-Meshing-Structuration type) and click Apply. It can be appreciated the limit tangency angle by default is 10 degrees, and the layers the entities belongs to are not considered. This parameter can be set by the user.
Generate the mesh with the default general mesh size.
In the generated mesh, the contact lines between surfaces that are tangent enough do not have nodes; contact points between lines tangent enough are also skipped when meshing.

Mesh skipping entities automatically.

Note that the size of the elements is more uniform than the ones of previous meshes.
Using the option of skipping entities it is also possible to assign sizes to different entities. As an example, select Mesh->Unstructured->Sizes by chordal error….

In the window enter 0.05 as chordal error.
Enter 10 as maximum meshing size and 0.1 as minimum meshing size.
Press OK.
Again, generate the mesh with the same default general mesh size.
This results in a high concentration of elements in curved areas, without the nodes in the lines and points that mesher skips. Now our approximation is significantly improved.

Mesh skipping entities automatically and assigning sizes by chordal error.

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