v0.2.0: PIVPy Modernization & Deep PIV Analysis Suite

PIVPy v0.2.0 Release Notes

Major release modernizing PIVPy for deep Particle Image Velocimetry (PIV) vector field post-processing, spectral turbulence analysis, vortex topology identification, out-of-core streaming, and interactive visualization.

🌟 Key Features & Highlights:

• Kinematic Vortex Topology: Added $\Gamma_1$ (vortex center core), $\Gamma_2$ (vortex boundary), Galilean-invariant $-criterion, Okubo-Weiss parameter {OW}$, and noise-robust circulation vorticity.
• Advanced Turbulence Statistics & Spectra: Full Reynolds decomposition ($\mathbf{u} = \overline{\mathbf{u}} + \mathbf{u}'$), 2D & radial 1D energy spectra (k)$ with exact continuous Parseval energy conservation, two-point spatial autocorrelations {uu}(r_x), R_{vv}(r_y)$, integral length scale {11}$, Taylor microscale $\lambda_T$, and turbulent dissipation rate ($\varepsilon$).
• Normalized Median Test & Inpainting: Westerweel & Scarano (2005) outlier detection and Laplacian harmonic inpainting.
• Velocity Gradient & Acceleration: Full strain rate tensor decomposition, maximum shear strain rate, and material acceleration \mathbf{u}/Dt$.
• Out-of-Core Streaming & IO: (1)$ memory Welford online streaming reductions (io.stream_statistics()), chunked Zarr ingestion (io.stream_directory_to_zarr()), and auto-detecting CSV reader.
• Interactive Marimo Dashboard & Visualizations: Standalone reactive Marimo explorer (pivpy.app / ds.piv.explore()) with live spectrum curves, diagnostics cards, fluid quiver animations (ds.piv.animate()), and publication figures.
• OpenPIV Skill Interoperability: Fully updated pivpy/skill.md and skills/pivpy/SKILL.md for automated LLM PIV analysis workflows.

PIVPy v0.1.2

What's Changed

• Add Python 3.13 and 3.14 to CI test matrix by @alexlib with @Copilot in #77
• Update README.md by @alexlib in #78
• Update test.yml by @alexlib in #84
• Bump pillow from 12.0.0 to 12.3.0 by @dependabot[bot] in #81

New Contributors

• @dependabot[bot] made their first contribution in #81

Full Changelog: 0.1.1...v0.1.2

PIVPy v0.1.1

• new documentation
• Most of the PIVMAT methods are implemented
• requires extensive testing by the community

PIVPy v0.1.0

Read CHANGES_SUMMARY.md

PIVPy v0.0.20

• main contribution from @nepomnyi that connects pivpy to vortexfitting package

PIVPy ver. 0.19

• uses new Lavision package lvpyio
• uses importlib.resources instead of pkg_resources

PIVPy v0.0.18

• fixed the bug in load_openpiv_txt
• improved other loading methods
• prepare for the move to pandas.read_csv method for all ASCII types
• split the openpiv .txt from .vec (although it's not including the header yet)

PIVPy v0.0.17

fixed notations
formatted with black
added fill_nans using scipy.griddata

PIVPy v.0.0.16

See pull request #38

• parse_headers return method for loading files
• we can load Davis8 old txt files as well as new vc7 files using lvreader library by Lavision
• graphics, io, methods are improved
• this release breaks backward compatibility - things will stop working now

PIVPy v0.0.15

• ke is now kinetic_energy
• fixed tke
• fixed reynolds_stress