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Add MRT-3D, porous media, geometry import, wind tunnel, DLPack, and CI - #1
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Delivers the M1 (dynamics), M2 (geometry & I/O), and remaining M4 (multiphysics) milestones as a set of validated, spec-driven capabilities. Dynamics & stencils - D3Q19 MRT collision (MRTdynamics3D / ForcedMRTdynamics3D) with the d'Humieres moment basis; BGK-reduction is bit-exact and the forced variant is validated against a 3D Poiseuille parabola. Physical models - Porous media via partial bounce-back (PorousForcedBGKdynamics): ns=1 is exact node bounce-back, ns=0 is BGK, graded in between. Validated with an analytic Darcy oracle and a self-contained forced-box test. Geometry & I/O - STL/OBJ import + voxelization behind an optional CyberMeshGenerator component (CYBERFLUIDS_GEOMETRY); the core stays dependency-free. Signed-distance grids are re-indexed into the lattice's cell order and drive off-lattice no-slip through the porous operator (voxel_field / cmg_loader). Solvers, bindings & interop - WindTunnel3D: external flow past an imported obstacle (far-field inlet + walls, zero-gradient outlet, voxelized body). Exposed through the C ABI and a Python WindTunnel class; examples/wind_tunnel.py runs a mesh end-to-end, writes VTK for ParaView, and renders side/top slice figures with a live progress readout. - Zero-copy DLPack interop for lattice fields (numpy/torch from_dlpack). Infrastructure - GitHub Actions CI: Linux build + full ctest (with libstdc++ par_unseq linked), a macOS Metal build, and an OpenSpec validation job. Docs & licensing - README showcase of the wind-tunnel result; Feature Status and Backends moved to docs/features.md and docs/backends.md. Project licensed under MIT. All 36 tests pass; every capability was reviewed and archived through OpenSpec.
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Summary
Delivers the M1 (dynamics), M2 (geometry & I/O), and remaining M4 (multiphysics) milestones
as validated, spec-driven capabilities. All 36 tests pass; each capability was reviewed and
archived through OpenSpec.
What's included
is bit-exact, forced variant validated against the analytic 3D Poiseuille parabola.
PorousForcedBGKdynamics) with an analytic Darcy oracle.CYBERFLUIDS_GEOMETRY),re-indexed onto the lattice and driving off-lattice no-slip through the porous operator. Core
stays dependency-free.
WindTunnelclass;examples/wind_tunnel.pyruns a mesh end-to-end, writes VTK for ParaView,and renders side/top slice figures.
from_dlpack).docs/; project licensed under MIT.Validation
oracle, bindings).
Poiseuille parabola, wind-tunnel wake/stagnation/deflection signatures); Palabos oracle for
the 2D + 3D cavity.