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model: contact pairs, general contact and Coulomb friction, mapped by the deck writers

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Contact definitions on face sets: a pair (each surface's nodes against the
other's faces), general contact on a surface (self contact) or on every
exterior face of the solids; Coulomb friction with static and kinetic
coefficients and an exponential decay, a penalty scale and the choice to
adjust or refuse initially penetrating nodes, validated with caps. Rigid
walls of explicit steps gain friction. The check wants solid faces on
contact surfaces; sets used by a contact cannot be deleted.

fem::contact: the closest point of a triangle (Ericson) or a bilinear
quadrilateral (projected Newton) to a point, and a bucket grid of face
boxes for the global search, deterministic and bounded.

Commands interaction.contact.pair, .general, .edit, .delete and .find
(the touching parts of the mesh, with face sets and pairs made of them);
contacts in the model browser. Abaqus writes *SURFACE INTERACTION with
*FRICTION (exponential decay), *CONTACT PAIR and general *CONTACT; LS-DYNA
*CONTACT_AUTOMATIC_SURFACE_TO_SURFACE and _SINGLE_SURFACE with FS, FD, DC;
Nastran refuses contact by name. The implicit solver refuses contact by
name (M7); the explicit solver refuses it until the next commit.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NmAttHhUZTokgPeEJia8sm
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-14 12:49:45 -04:00
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docs/features.md
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@@ -6,7 +6,7 @@ Every entry is a toolbar button. **Ready** entries run their command; **coming s
shown greyed with the roadmap milestone that brings them (ROADMAP.md). Scripts, the command line,
the control channel and AI agents over MCP (docs/mcp.md) run the same commands.
56 ready, 48 coming soon.
59 ready, 45 coming soon.
## Geometry
@@ -103,9 +103,9 @@ the control channel and AI agents over MCP (docs/mcp.md) run the same commands.
| Constraints | Reference Point — A reference point for couplings, loads and boundary conditions | ready | `model.reference_point.create`, `model.reference_point.edit`, `model.reference_point.delete` |
| Constraints | Coupling — Kinematic or distributing coupling of a set to a reference point | ready | `model.coupling.create`, `model.coupling.edit`, `model.coupling.delete` |
| Constraints | Tie — Tie non-matching meshes together | coming soon (M7) | |
| Contact | General Contact — Contact between everything that touches, with friction | coming soon (M7) | |
| Contact | Contact Pair — Contact between two surfaces | coming soon (M7) | |
| Contact | Find Contacts — Detect contact pairs automatically | coming soon (M7) | |
| Contact | General Contact — Contact between everything that may touch, or self contact of a surface, with friction (explicit dynamics) | ready | `interaction.contact.general`, `interaction.contact.edit`, `interaction.contact.delete` |
| Contact | Contact Pair — Contact between two surfaces, with friction (explicit dynamics) | ready | `interaction.contact.pair`, `interaction.contact.edit`, `interaction.contact.delete` |
| Contact | Find Contacts — Find the parts of the mesh that touch, and make contact pairs of them | ready | `interaction.contact.find` |
| Contact | Rigid Wall — Rigid walls for explicit dynamics | coming soon (M10) | |
| Connectors | Bolt Load — Bolt pretension | coming soon (M7) | |
| Connectors | Spring — Spring or dashpot to the ground or between two points, along a direction or their line | ready | `model.spring.create`, `model.spring.edit`, `model.spring.delete` |