forked from 1b-agent/fieldcraft-upstream
jyvikoandClaude Opus 5.5
f9981d305e
Each secondary node follows the main surface under it as the weighted average u_A = sum_J (M_AJ / sum_K M_AK) u_J with M_AJ = int psi_A N_J over the reference overlaps and psi the secondary faces' dual shape functions (Wohlmuth 2000), so the secondary mortar matrix is diagonal; the rows join the couplings' constraint elimination in every implicit analysis. Uncovered secondary nodes stay free with a warning; heat transfer and explicit dynamics refuse ties by name. Tested by the tie patch test on non-matching hex8/tet4 meshes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo