flow_state

Compressible flow state calculations for Python.

Install

pip install flow-state-calculator

Quick Start

API:

from flow_state import solve

# From Mach and altitude
state = solve(mach=2.0, altitude=10000)

# From Mach and stagnation conditions (wind tunnel)
state = solve(mach=6, pres_stag=(140, "psi"), temp_stag=420)

# From Mach and target unit Reynolds number
state = solve(mach=5.3, re1=12.8e6)

print(state)  # Full summary
print(state.pres, state.temp, state.re1)

CLI:

flow-state init    # Create a config template
flow-state solve   # Solve from flow_config.toml

• API Usage: https://uahypersonics.github.io/flow-state/user_guide/api_usage/
• CLI Usage: https://uahypersonics.github.io/flow-state/user_guide/cli_usage/

Documentation

Full documentation: https://uahypersonics.github.io/flow-state

Citation

If you use flow_state in your research, please cite it:

@software{flow_state,
  author = {Hader, Christoph},
  title = {flow\_state: Compressible Flow State Calculations},
  url = {https://github.com/uahypersonics/flow-state},
  year = {2026}
}

Code Style

This project follows established Python community conventions so that contributors can focus on the physics rather than inventing formatting rules.

Releasing

This project uses Semantic Versioning (vMAJOR.MINOR.PATCH):

• MAJOR (v1.0.0, v2.0.0): Breaking API changes
• MINOR (v0.3.0, v0.4.0): New features, backward-compatible
• PATCH (v0.3.1, v0.3.2): Bug fixes, minor corrections

To publish a new version to PyPI:

1. Regenerate the API architecture diagram:

   pydeps src/flow_state --noshow --max-bacon=4 --cluster -o docs/assets/architecture.svg
   

2. Commit and push to main
3. Tag and push:

   git tag -a vMAJOR.MINOR.PATCH -m "Release vMAJOR.MINOR.PATCH"
   git push origin vMAJOR.MINOR.PATCH
   

The GitHub Actions workflow will automatically build and publish to PyPI via Trusted Publishing.

License

BSD-3-Clause. See LICENSE for details.