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test P1 tri locking with fixed diagonal mesh#26

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th-skam merged 1 commit into
main-freefem-sofafrom
test-incompressible
Jun 15, 2026
Merged

test P1 tri locking with fixed diagonal mesh#26
th-skam merged 1 commit into
main-freefem-sofafrom
test-incompressible

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@Fimache

@Fimache Fimache commented Jun 8, 2026

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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

@th-skam th-skam force-pushed the test-incompressible branch from 672f41c to 4284f8b Compare June 15, 2026 09:10
@th-skam th-skam force-pushed the test-incompressible branch from 4284f8b to bc7e73f Compare June 15, 2026 09:13
@th-skam th-skam merged commit a5ece5b into main-freefem-sofa Jun 15, 2026
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@th-skam th-skam deleted the test-incompressible branch June 15, 2026 09:14
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2 participants