OneCAD-Simulation/ROADMAP.md

Roadmap

ModelCraft's goal is CAE modeling on par with Abaqus/CAE, Nastran pre-processors and LS-PrePost, with hexahedral meshing as the centre of gravity, plus its own linear solver. Abaqus/CAE is the reference for scope (its documentation is excellent and its solver strong); its application is where we aim to be clearly better: parametric geometry from SolidCraft, sets that survive remeshing, automatic hex partitioning, undo, a text-diffable model and agent control. The capability checklist is docs/parity.md. Beyond the pre-processor and the linear solver come our own explicit, CFD (lattice Boltzmann) and fluid–structure solvers (M10–M14; methods and papers in docs/solvers/literature.md).

Order (revised 2026-10-13): one end-to-end slice first — SolidCraft part → named faces → sets → mesh → material and section → BCs and loads → static and frequency steps → Abaqus, Nastran and LS-DYNA decks and our own solve → contour plot — on tet meshes, so every hex mesher lands in a pipeline that already produces solvable, verified models. Then hex: structured (sweep and mapped, with partitions proposed automatically) before octree all-hex, because that is how analysts get hex meshes today and it gives the best elements where stresses are read.

Milestone	Scope	Status
M0 Foundation	Workspace, quality gates, FE model, command engine with rollback and panic guard, CLI, geometry boundary on SolidCraft	done
M1 Geometry in and surface preparation	Open .solidcraft designs with persistent face names, assemblies placed (done); face-tagged 3MF (done); test corpus, cargo xtask corpus (done); exact predicates (done); quality metrics and certified validity gate (done); weld, closed/manifold/orientation and self-intersection checks, feature edges (modelcraft-mesh::surface, mesh.surface.check, done)	in progress
M2 Tet meshing and size field	Size field (global, per face and edge seeds, curvature and proximity; the modelcraft_mesh::size::SizeField trait and edge-division helpers are in); Bowyer–Watson Delaunay (exact, symbolic perturbation, verified; modelcraft-mesh::delaunay, done); robust CDT boundary recovery (Diazzi et al. 2023); Delaunay refinement, ODT smoothing, sliver removal; tet4 and tet10 with mid-side nodes on the B-rep; mesh verify per set	in progress
M3 First deck	Sets and surfaces bound to SolidCraft face, edge, vertex and body names, resolved after meshing; materials (isotropic and orthotropic elastic, density) with a unit-system label and consistency check; sections (solid, shell, beam profiles) assigned by set; element formulation per region mapped to each solver; BCs (fixed, displacement, symmetry); loads (force and moment on reference points, pressure, gravity); reference points with kinematic and distributing coupling; steps (linear static, frequency) with explicit per-step load and BC tables and output presets; model.check naming every missing or bad item; model.* and mesh.tag commands (model definition: done); writers for Abaqus input (done: deck.write), Nastran SOL 101/103 (done: deck.write) and LS-DYNA implicit (done); the .modelcraft file (text definition, binary mesh, geometry references reopened on load, journal; atomic saves, autosave and recovery; undo/redo on the journal: done)	in progress
M4 Own solver and first results	Linear static and modal solver (tet4/10, hex8, hex20; sparse direct, Lanczos), verified against analytic solutions (solver: done — modelcraft-fem kernels, modelcraft-solver with nested dissection, sparse Cholesky and block Lanczos, solve.static/solve.frequency/solve.probe, patch, cantilever, Lamé, Kirsch and beam-frequency tests); deformed shape, contours, mode shapes, probes, reaction sums	started
M5 Structured hex	2D quad meshing of faces (modelcraft-mesh::quad: transfinite mapped meshes, free all-quad meshes of polygons with holes on prescribed boundary nodes, exact planar quad validity, shared SizeField and even edge divisions; done for planar faces); mapped hex of six-sided regions; sweep meshing; conforming interfaces and tet–hex transition; automatic decomposition into sweepable and mappable regions, proposed as SolidCraft splits	started
M6 Automatic hex	Octree/grid-dual all-hex for any part; hex-dominant by tet recombination; polycube for blocky parts; smoothing, untangling, boundary padding, layers through thin walls; mesh editing and orphan-mesh import	planned
M7 Assemblies and contact	Part instances from SolidCraft occurrences; tie between non-matching meshes; general and pairwise contact with automatic pair detection, friction; bolt pretension, springs, point masses; amplitudes, multiple steps; nonlinear static steps in decks	planned
M8 Materials, explicit, shells, composites	Plasticity, hyperelasticity, damage data per solver; explicit dynamics decks (Abaqus/Explicit, LS-DYNA); midsurface shells; composite layups and material orientations, continuum shells on swept hex; heat transfer	planned
M9 Post-processing and deck readers	Results readers for public formats (Nastran OP2, LS-DYNA d3plot, Abaqus .fil); XY and path plots, cuts, display groups, free-body forces; deck readers that keep unknown keywords; mesh convergence studies	planned
M10 Explicit dynamics	Shared element and material kernels with the implicit solver (fem); central-difference solver with lumped mass, stable time step, one-point hex8 with hourglass control and nodal-pressure tet4, bulk viscosity, energy accounting; large-deformation materials (objective rates, J2, Johnson–Cook, damage, erosion); contact (global search, penalty with friction, rigid walls); runs on hex and tet meshes	planned
M11 Equations of state and shells	Polynomial, ideal-gas, Mie–Grüneisen, JWL with programmed burn, tabulated; energy coupling; shock verification (Rankine–Hugoniot, Sod, Noh, Sedov); Belytschko–Lin–Tsay shells with self-contact on quad meshes	planned
M12 CFD: lattice Boltzmann	D3Q19/D3Q27 on grids voxelised from the face-tagged surface; TRT, regularised and cumulant collision; interpolated walls, inlets and outlets; LES; octree refinement shared with the hex mesher; wgpu backend (deterministic per device, checked against the CPU)	planned
M13 Fluid–structure interaction	Immersed-boundary coupling of the lattice Boltzmann fluid with the explicit or implicit structure; interface force transfer; sub-cycling; Aitken then interface quasi-Newton coupling; free-surface flow	planned
M14 Blast and impact fluids	EOS-driven fluids in the explicit solver: ALE multi-material or SPH, with fluid–structure contact	planned
Continuous: desktop and agents	Desktop app (viewport, model tree, commands, control channel: done), MCP server, browser build, command schema as the public API	started