grinsfem / grins

Multiphysics Finite Element package built on libMesh
http://grinsfem.github.io
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Add Incompressible Hyperelasticity #587

Closed pbauman closed 5 years ago

pbauman commented 5 years ago

Both plane strain and 3D, totally analogous to recent refactoring in #586 for CompressibleHyperelasticity. Includes exact solution tests for both 2D and 3D.

This is an unstabilized formulation, which is exactly Stokes in the linear case, so requires Q2/Q1 or analogous FEM spaces, so is quite a bit more expensive. Would be nice to add a stabilized formulation in the future.

Nearly incompressible requires just one small change in the pressure term.