[Gmsh] Question / potential bug - characteristic length meshing issue

[Keith Johnson]

Greetings,

I am fairly new with respect to gmsh, and have been following the
distribution list mail for several months now.  Most of the questions
and answers are very helpful.

I have run into a problem which can be reduced to a simple case of
looking at a 2d / 3d mesh on a finite thickness cylindrical disk with a
hole (compressed geom file attached).

When I set the characteristic length as the one that is presently
active, I have problems with surfave and volume mesh generation.  If I
set the characteristic length, lcart2, to any of the other two values,
every thing works.  

This is only a small part of a much larger model, but my present
difficulty can be reduced to this simple case.

It is highly possible that I am not doing something correctly, but it
does not make sense that two values of characteristic length work fine
and the third does not.

The case, here is that the smallest characteristic length that works is
not sufficient discretization.

Have I bumped into a bug, or am I not doing something correctly?

Incidentlly, I have tried to make this cylindrical disk in several
different ways, as you might imagine ( i.e. extruding lines to make all
the surfaces, sweeping a radial cross section of surfaces (as in the
attached model), defining actual lines, arcs, surfaces, etc ) and have
had the same kinds of problems.

Thanks for your consideration, thoughts and comments.

Best Regards,

Keith
-- 

Keith E. Johnson, P.E. Ohio
Phone:		330-497-5551
email:		kedmundj at neo.rr.com
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