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fluidsim skill

by K-Dense-AI·K-Dense-AI/scientific-agent-skills·47k stars·MIT

Plan, configure, inspect, restart, and analyze bounded FluidSim computational-fluid-dynamics simulations with explicit numerical-validity and HPC safety checks. Use for FluidSim solver selection, parameter review, FFT/MPI setup, output diagnostics, or restart compatibility.

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Clean: nothing in its files matched our rules. We read 16 files in the folder on 2026-09-28.

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Install the fluidsim skill

A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description.

git clone --depth 1 https://github.com/K-Dense-AI/scientific-agent-skills.git /tmp/scientific-agent-skills
mkdir -p ~/.claude/skills
cp -r /tmp/scientific-agent-skills/skills/fluidsim ~/.claude/skills/fluidsim
available in every project

In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub

The instructions your agent would load

SKILL.md as published, without the frontmatter. Read it on GitHub

FluidSim

Use FluidSim 0.9.0 as a framework for Python-defined numerical solvers, especially periodic Cartesian pseudospectral CFD. Upstream FluidSim is CeCILL-2.1; the MIT frontmatter license applies only to this skill.

This skill does not treat a completed run, a stable time step, a smooth plot, or a closed program exit as evidence of numerical convergence or physical validity.

Required workflow

initial conditions, forcing, observables, and acceptance criteria.

  1. State equations, units or nondimensionalization, geometry, boundaries,

timestep, CFL, resolution, and dealiasing bounds.

  1. Select a verified solver and inspect its generated default parameters.
  2. Create a strict JSON plan with explicit CPU, RAM, disk, wall-time, output-file,

explicit config-ID acknowledgement.

  1. Run the bundled validator and resource estimator.
  2. Generate and review a dry-run script. It does nothing unless executed with an

tails, CFL/time-step history, and output growth.

  1. Run one tiny serial pilot. Inspect budgets, divergence/constraints, spectral

and observable sensitivity.

  1. Refine grid and time step independently. Check conservation/budget residuals

automatically.

  1. Only then prepare a site-specific MPI job. Never submit or launch MPI

output inventory, checksums, and restart lineage.

  1. Preserve config, script, uv.lock, package/platform/backend versions, logs,

Stop if physical assumptions, units, boundary conditions, forcing semantics, resolution criteria, resource limits, or acceptance criteria are missing.

Version and installation

As verified on 2026-07-23:

the smoke test, but ns2d.createdefaultparams() failed until the fft extra was installed.

  • Latest stable PyPI release: fluidsim==0.9.0 (2025-12-04).
  • Package metadata requires Python >=3.11 and lists Python 3.11–3.14.
  • Pseudospectral parameter creation needs FluidFFT; bare fluidsim imported in

pyFFTW==0.15.1.

  • Current companion versions tested here: fluidfft==0.4.5 and

Prefer a project lock:

uv init --python 3.11
uv add "fluidsim[fft]==0.9.0" "fluidfft==0.4.5" "pyFFTW==0.15.1"
uv lock
uv sync --frozen

For an isolated disposable environment:

uv venv --python 3.11
uv pip install "fluidsim[fft]==0.9.0" "fluidfft==0.4.5" "pyFFTW==0.15.1"

The project lock is the reproducibility record; direct pins alone do not freeze all transitive artifacts. Do not reuse a lock across incompatible platforms or MPI ABIs.

MPI is optional and native:

uv add "mpi4py==4.1.2" "fluidfft-mpi-with-fftw==0.0.1" "fluidfft-fftwmpi==0.0.1"
uv lock

Those packages still require a compatible MPI runtime and FFTW development libraries. The optional native plugins are:

fft2d.withfftw1d, fft2d.withfftw2d, fft3d.with_fftw3d.

  • fluidfft-fftw==0.0.1: sequential

fft2d.mpiwithfftw1d, fft3d.mpiwithfftw1d.

  • fluidfft-mpi-with-fftw==0.0.1: MPI

fft2d.mpiwithfftwmpi2d, fft3d.mpiwithfftwmpi3d.

  • fluidfft-fftwmpi==0.0.1: MPI-enabled FFTW

stacks for the target cluster.

  • fluidfft-p3dfft==0.0.1: fft3d.mpiwithp3dfft; requires P3DFFT.
  • FluidFFT also declares PFFT and P3DFFT extras; audit and pin their native

FluidFFT documents cuFFT historically, but FluidFFT 0.4.5 declares no CUDA extra or installed GPU plugin in its package metadata, and its CUDA installation page is unfinished. Do not claim GPU acceleration or install an unrelated CUDA wheel as a FluidSim backend. Treat GPU work as source-level experimental integration requiring separate validation.

See installation for system dependencies, MPI ABI, HDF5-MPI, backend discovery, and verification.

API snapshot

Use direct, versioned imports:

from fluidsim.solvers.ns2d.solver import Simul

params = Simul.create_default_params()
params.oper.nx = params.oper.ny = 32
params.oper.Lx = params.oper.Ly = 2 * 3.141592653589793
params.oper.coef_dealiasing = 2 / 3
params.time_stepping.USE_CFL = True
params.time_stepping.cfl_coef = 0.5
params.time_stepping.deltat0 = 0.001
params.time_stepping.deltat_max = 0.01
params.time_stepping.t_end = 0.1
params.time_stepping.max_elapsed = "00:05:00"
params.init_fields.type = "noise"
params.init_fields.noise.velo_max = 0.01
params.output.HAS_TO_SAVE = False
params.output.ONLINE_PLOT_OK = False

Important 0.9 corrections:

params.forcing.tcrandom.timecorrelation, not a flat tcrandomtime_correlation.

  • CFL field: params.timestepping.cflcoef, not CFL.
  • Time-correlated forcing:

fromfile, fromsimul, and in_script; do not invent a universal list for every solver.

  • NS2D default initial types include constant, noise, jet, dipole,

spectra1D.h5/spectra2D.h5; scalar means are solver-dependent spatial_means.txt or JSON-lines.

  • Output state files default to statephyst*.nc; spectra use
  • params.output.subdirectory is relative under FLUIDSIMPATH.

ParamContainer rejects undeclared attributes. Always generate defaults from the selected Simul class and inspect them before changing values. See parameters.

Solvers

Primary Cartesian CFD keys and imports:

from fluidsim.solvers.ns2d.solver import Simul       # ns2d
from fluidsim.solvers.ns2d.bouss.solver import Simul # ns2d.bouss
from fluidsim.solvers.ns2d.strat.solver import Simul # ns2d.strat
from fluidsim.solvers.ns3d.solver import Simul       # ns3d
from fluidsim.solvers.ns3d.bouss.solver import Simul # ns3d.bouss
from fluidsim.solvers.ns3d.strat.solver import Simul # ns3d.strat

The 0.9 registry also includes plate2d, sw1l variants, waves2d, 1D models, 0D models, spherical solvers, and framework adapters. Availability in the registry does not make a solver appropriate for a scientific question. Verify equations, variables, geometry, boundaries, and diagnostics in the solver source. See solvers.

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