[Gmsh] What is a valid mesh in Gmsh?

[Serban.Georgescu at uk.fujitsu.com]

Hello all,

I have a short question to test my understanding of what is a correct 3D mesh for Gmsh.
In the attached file I have a screenshot of a mesh that I have generated for a cylinder, using a very large element size.
(I know how to generate a better one, this is only to support my question)

AFAIK, from a FEM point of view, this mesh is not correct because the elements in the lower part are connected to the ones in the upper part only through an edge. However, I see no errors or warnings in Gmsh, so I assume for Gmsh this represents a correct FEM mesh.
Am I correct?

Thank you!
Serban

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