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Jukka Aho
77766d6ee4
Long commit subjects and bullets are hard to read in narrow terminals and mailed logs. Contributors using `.githooks` via core.hooksPath now get an automatic guard in addition to the two-file pre-commit cap. - Add `.githooks/commit-msg` to fail when any message line exceeds 80 chars - Skip length checks while `.git/MERGE_HEAD` exists for merge commits - Sync AGENTS.md, README.md, CONTRIBUTING.md, and commit.prompt.md
121 lines
4.4 KiB
Markdown
121 lines
4.4 KiB
Markdown
# JuliaFEM.jl
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[](https://github.com/JuliaFEM/JuliaFEM.jl)
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[](https://zenodo.org/badge/latestdoi/35573493)
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[](https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md)
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JuliaFEM.jl is an open-source finite element framework written in Julia.
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The package is still **0.x**; the repository is in the middle of a deliberate
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architectural reset toward a **stable 1.0** with a type-stable, zero-allocation,
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GPU-friendly assembly pipeline. Many older READMEs and tutorials still describe
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the previous API; when in doubt, trust the code and [`AGENTS.md`](AGENTS.md).
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Contributions (bug reports, docs, tests, and features) are welcome.
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## Status
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Current focus areas:
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- `Element{K, P, S, N}` template with compile-time DOF layout.
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- `DOFHandler` and `DOFBasedCOOAssembler` (zero-allocation hot paths).
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- Microkernel-style physics in `src/domains/{continuum, heat, thermo_elastic}/`.
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- Matrix-free `apply_K!`, `apply_M!`, Dirichlet, multipoint constraints,
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IC(0) / Jacobi / block-Jacobi preconditioners and a generalized
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eigensolver in `src/assemblers/`.
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- A KernelAbstractions backend for the matrix-free path with a Float32
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Metal smoke test in `test/backend/metal/`.
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The legacy element-based API (`Problem`, `update!`, `Analysis`, …) is
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still present under `src/legacy/` for backward compatibility but is not
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the recommended entry point.
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## Installing
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```julia
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using Pkg
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Pkg.add("JuliaFEM")
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```
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## A modern minimal example
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```julia
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using JuliaFEM
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mesh = create_structured_box_mesh(Hex8;
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xmin = 0.0, xmax = 1.0, nx = 4,
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ymin = 0.0, ymax = 1.0, ny = 4,
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zmin = 0.0, zmax = 1.0, nz = 4,
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)
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S = @DOFSet{u::DOF{Displacement{3}, Vertex}}
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ET = Element{Hex8, Lagrange{1}, S}
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elements, handler = create_elements!(mesh, ET)
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material = LinearElastic(E = 210e9, ν = 0.3)
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kernel = ContinuumKernel(ContinuumFormulation{FullThreeD}(),
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material, Displacement{3}())
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asm = DOFBasedCOOAssembler()
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cache = create_cache(asm, elements, handler, mesh, kernel)
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assemble!(cache, asm, kernel, mesh)
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K, f = extract_system(cache)
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```
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The same block is parsed from this file in `test/docs/readme_example.jl`, so it stays
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copy-pasteable as the API evolves.
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For a matrix-free Krylov solve, see
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`test/assemblers/test_dof_based_apply_K.jl` and
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`test/assemblers/test_eigensolve.jl`.
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## Documentation
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- [`docs/repository_layout.md`](docs/repository_layout.md): where to put new files
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(full text under [`docs/src/repository_layout.md`](docs/src/repository_layout.md)).
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- [`docs/`](docs/): Documenter-built API reference and user-facing index.
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Historical Jupyter tutorials under [`docs/tutorials/`](docs/tutorials/)
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(2015-2016 API; reference only).
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- `src/<topic>/README.md`: short module notes (topology, mesh, materials, ...).
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## Contributing
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Please read [`docs/CONTRIBUTING.md`](docs/CONTRIBUTING.md) before opening a pull
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request: fork and branch, keep changes review-sized, run tests, and describe
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what you changed.
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**Git commits.** Keep history easy to read: small commits, usually one file;
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**two files** in one commit is fine when they are inseparable (e.g. a helper and
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its only caller). With `.githooks/` and `core.hooksPath`, **pre-commit** caps
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staged paths at two and **commit-msg** rejects log lines longer than **80
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characters** (wrap subject, summary, and bullets). If that workflow feels
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unfamiliar, open your PR with tests passing and ask for help splitting history
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in review.
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**Code expectations.** Assembly hot paths must stay type-stable and allocation-free
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after warmup; CI and [`test/assemblers/test_dof_based_zero_alloc.jl`](test/assemblers/test_dof_based_zero_alloc.jl)
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guard that. The full suite:
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```bash
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julia --project=. -e 'using Pkg; Pkg.test()'
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```
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Use that locally before opening a PR; CI runs the same tests.
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## Citing
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If you use JuliaFEM.jl in academic work, please cite
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```text
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@article{frondelius2017juliafem,
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title = {Julia{FEM} - open source solver for both industrial and academia usage},
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volume = {50},
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url = {https://rakenteidenmekaniikka.journal.fi/article/view/64224},
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doi = {10.23998/rm.64224},
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number = {3},
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journal = {Rakenteiden Mekaniikka},
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author = {Frondelius, Tero and Aho, Jukka},
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year = {2017},
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pages = {229-233}
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}
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```
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