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test P1 tri locking with fixed diagonal mesh#26

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test-incompressible
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test P1 tri locking with fixed diagonal mesh#26
Fimache wants to merge 1 commit into
main-freefem-sofafrom
test-incompressible

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@Fimache Fimache commented Jun 8, 2026

MMS incompressible test with mixed Dirichlet-Neumann BC.

  • 2 corners fixed (Dirichlet), rest of boundary has traction (Neumann)
  • Q1 quad (structured) vs P1 tri (Gmsh)
  • Plane stress (2d) and plane strain (3d)
  • Locking ratio computed: LR = ||u_h||_H1 / ||u_exact||_H1
  • Issue: ux oscillates on y=L/2 for Q1 quad despite LR≈1

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