flow
GPU-accelerated incompressible Navier–Stokes solver for flow in complex geometry, built around a
staggered MAC grid, a signed-distance-field (SDF) description of the solid, a cut-cell Immersed
Boundary Method, and a pressure-projection step with a geometric multigrid Poisson solve. The code is
written in Kokkos C++ (one source runs on the CUDA, HIP/AMD, and OpenMP backends, selected at build
time) and exposed to Python through nanobind (zero-copy, on core's View↔ndarray bridge);
simulations are driven from Python.
The repository is also known as
pnm_from_sdf(its GitLab origin) — it computes pore-network–scale flow directly from segmented SDF geometry. The pore-network extraction itself (the formerpeclet.flow.pnmmodule) now lives in its own suite project, peclet-pnm (peclet.pnm).
Modules
| Module | Role |
|---|---|
flow |
The CFD solver — a distributed (MPI-optional) GPU cut-cell IBM Navier–Stokes solver in physical units, built on the shared core block-decomposition + async halo layer. One code / one API / MPI-optional, with native domain boundary conditions. Exposes peclet.flow.Solver (staggered MAC, default) and peclet.flow.SolverColocated (collocated/cell-centered velocities, ABC approximate projection) — identical API via a GridLayout policy. Validated against analytics and Zick & Homsy sphere-array drag (scripts/validate_zick_homsy_sdflow.py). |
The original CUDA implementation has been retired (Kokkos became canonical, 2026-06); flow was
validated bit-identical to the CUDA solver — to machine precision, and against Zick & Homsy sphere-array
drag — before the CUDA sources were deleted (restore point: git tag pre-cuda-retirement). The shared
cut-cell IBM primitives now live in src/cut_cell_ibm.hpp; the operator headers are src/mac_*.hpp +
src/flow_ibm.hpp (the Solver class declarations + state; its member definitions are split by
physics domain across twelve src/flow_ibm_*.hpp headers it includes -- see CLAUDE.md's Layout
section).
Capabilities
- Geometry: SDF solids (negative inside); the cut-cell IBM applies a Robust-Scaled no-slip / moving-wall condition and a matching cut-cell pressure operator (face openness from the SDF).
- Native domain boundary conditions (
flow): per-face periodic / no-slip wall / Dirichlet velocity (inflow) / outflow / free-slip (symmetry plane), plus per-position inlet velocity profiles. Validated on the lid-driven cavity (Ghia et al.), the developing plane channel (Poiseuille), the backward-facing step (Armaly/Gartling), and a half channel closed by a symmetry plane (pointwise equal to the full one). - Pressure multigrid: rediscretized geometric V-cycle, grid-independent, with MG-PCG, flexible MG-CG and Chebyshev outer accelerators, an agglomerated coarse solve and coarse-level telescoping. Works on periodic, IBM and non-periodic (BC) domains, including semi-coarsening for thin (quasi-2D) grids.
- Two-phase flow: geometric VoF (PLIC + Weymouth–Yue advection), height-function curvature, balanced-force surface tension, contact angles and phase change.
- Time integration: pressure projection with optional incremental pressure, explicit (Koren) or implicit-deferred-correction advection, and Picard outer iteration.
Build
# Canonical: build + install via scikit-build-core
CMAKE_PREFIX_PATH="$PWD/../extern/install/<backend>" pip install . # -> peclet.flow
# Or a dev cmake build (nanobind found via the active interpreter, no cmakedir needed).
# ONE tree per backend: add the test suites, and MPI, to the same tree.
cmake -S . -B build_dev -DCMAKE_PREFIX_PATH="$PWD/../extern/install/<backend>" \
-DPECLET_FLOW_BUILD_TESTS=ON -DPECLET_FLOW_MPI=ON -DMPIEXEC_EXECUTABLE=/usr/bin/mpirun
cmake --build build_dev -j
<backend> is one of nvidia-cuda / host-openmp / lumi-hip under ../extern/install/, produced once
by ../tools/bootstrap_deps.sh (a hard build dependency). Requirements: a Kokkos backend (CUDA/HIP/OpenMP
— CUDA is just one option, not required), a C++20 host compiler, nanobind + scikit-build-core, and —
for distributed flow — MPI. Python dependencies live in a virtual environment (.venv).
Run / verify
Simulations are scripts, not C++ mains. The scripts/verify_*_sdflow.py files are the canonical
verification entry points:
source ../.venv/bin/activate # THE suite venv (see ../CLAUDE.md, "One venv")
export PYTHONPATH=$PWD/build_dev
python scripts/verify_lid_cavity_sdflow.py # lid-driven cavity vs Ghia, Ghia & Shin (1982)
python scripts/verify_channel_sdflow.py # developing plane channel -> Poiseuille
python scripts/verify_bfs_sdflow.py # backward-facing step (reattachment length)
# the C++ kernel + multi-rank suites, from the tree built above (156 registered, 154 without
# the `bench`-labelled timing instruments):
OMP_NUM_THREADS=8 OMP_PROC_BIND=false ctest --test-dir build_dev --output-on-failure -LE bench
Documentation
API documentation (C++ classes/kernels and Python scripts) is generated with Doxygen and published to
GitHub Pages by the Documentation CI workflow. Build it locally with:
doxygen docs/Doxyfile # output in docs/html/index.html
The architecture, conventions and design rationale are in CLAUDE.md and the design
notes under doc/; the campaign records and work orders that produced them are
archived, indexed and unmaintained under doc/history/.
1 maintainer
Metadata
1 maintainer
Release files for peclet-flow 1.1.0
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Transparency logRelease files / peclet_flow-1.1.0-cp310-cp310-win_amd64.whl
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Transparency logRelease files / peclet_flow-1.1.0-cp310-cp310-manylinux_2_27_x86_64.manylinux_2_28_x86_64.whl
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Transparency logRelease files / peclet_flow-1.1.0-cp310-cp310-manylinux_2_26_aarch64.manylinux_2_28_aarch64.whl
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Transparency logRelease files / peclet_flow-1.1.0-cp310-cp310-macosx_11_0_arm64.whl
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| Tags | CPython 3.10 macOS 11.0+ ARM64 |
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