[petsc-users] Convergence of iterative linear solver

[Jed Brown]

Eduardo <erocha.ssa at gmail.com> writes:

> I am solving a FEM solid mechanics linear elasticity model, for now the
> only problem is the mesh that has needle-shaped and very flat elements.

Why does it have such elements?  Is the material highly anisotropic
(e.g., fiber)?  Is the geometry anisotropic (shell structures
discretized using volumes)?  Is it just a low-quality mesh?

As Mark says, thresholding is important for AMG to solve anisotropic
problems, but many of the discretizations used in solid mechanics will
obscure the anisotropy from the usual strength of connection measures.
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