Mortar Fixture-Workpiece Comparison

This tutorial summarizes tutorials/contact/mortar_fixture_workpiece_comparison.py. It is a compact numerical check for coarse P1 mortar on small fixture/workpiece interface solves.

Run

PYTHONPATH=src python tutorials/contact/mortar_fixture_workpiece_comparison.py

The script runs two cases:

• matching fixture/workpiece surface meshes

• nonmatching fixture/workpiece surface meshes with a supermesh

The dual mortar result is used as the reference. The main quantity to inspect is the coarse P1 row, which should stay close to the dual reference while using fewer multiplier DOFs for this low-order interface response.

Pass --all-variants when you want to inspect the lower-level diagnostic rows used for development comparisons.

Output

The table reports:

• multiplier DOFs

• KKT rank and size

• displacement infinity-norm error against dual mortar

• relative work-like scalar error against dual mortar

Optional VTU output:

PYTHONPATH=src python tutorials/contact/mortar_fixture_workpiece_comparison.py \
    --output-dir result/tutorials/mortar_fixture_workpiece

The VTU path writes fixture and workpiece surface files for the displayed rows when meshio is installed. Combine it with --all-variants to export the diagnostic variants too.