examples/platewithhole-nurbs.py

nrefine=2 Number of uniform refinements starting from 1x2 base mesh.
traction=.1 Far field traction (relative to Young's modulus).
radius=.5 Cut-out radius.
poisson=.3 Poisson's ratio, nonnegative and strictly smaller than 1/2.

topology 1/1

integrating 1 distinct blocks

hole radius exact up to L2 error 9.36e-17

project

projection type: lsqr

integrating 1+1+1+1 distinct blocks

solve

solving 60 dof system to machine precision using direct solver

refinement iteration 1

residual decreased to 4e-17

refinement iteration 2

residual decreased to 4e-17

refinement iteration 3

residual increased to 5e-17 (discarding)

solver returned with residual 4e-17

constrained 60/60 dofs, error 0.00e+00/area

optimize

topology 1/1

integrating 1+1+1 distinct blocks

constrained 12/120 dofs

optimum value 0.00e+00

optimize

topology 1/1

integrating 1+2+1 distinct blocks

solve

solving 18 dof system to machine precision using direct solver

refinement iteration 1

residual decreased to 1e-17

refinement iteration 2

residual decreased to 9e-18

refinement iteration 3

residual increased to 1e-17 (discarding)

solver returned with residual 9e-18

constrained 30/120 dofs

optimum value 9.74e-08

topology 1/1

integrating 1+1 distinct blocks

solve

solving 90 dof system to machine precision using direct solver

refinement iteration 1

residual decreased to 2e-16

refinement iteration 2

residual increased to 2e-16 (discarding)

solver returned with residual 3e-16

evaluating 88%

RuntimeWarning: singular matrix In /home/docs/checkouts/readthedocs.org/user_builds/nutils/checkouts/v6.2/nutils/warnings.py:30

stressxx.png

topology 1/1

integrating 1 distinct blocks

errors: L2=9.49e-05, H1=2.86e-03