[Gmsh] meshing rounded surfaces

[Magdalena Stolarska]

I am working on a dynamic, large-deformation, moving mesh problem.  I use 
gmsh to generate the original mesh, and for the particular problem on 
which I am working I have been generating hemispherical or semi-ellipoidal 
meshes.  The problem that I am having is that near the rounded surface of 
the mesh, the nodes of the tetrahedra mesh to be nearly co-planar, and 
this is causing problems within a few time iterations.  I realize that one 
way to solve the problem is to periodically remesh.  However, I want to be 
able to do this as infrequently as possible.  So, my question is:  Is 
there anyway to control how coplanar some of the nodes in 3d tetrahedral 
meshes are?  Thanks is advance for your response.

MS