piv_strain_rate — PIV `field` op

• Data kinds: flow2d → image2d

• Call: import pivops; pivops.piv_strain_rate(flow, spacing=1.0) (or opspiv.get("piv_strain_rate"))

Usage

> This operator's description has not been translated yet. The original text follows as it is.

ひずみ速度の大きさ `sqrt(2 e_ij e_ij)`。剛体回転では 0 になる。

実測: 剛体回転 0.0 / 一様膨張 s=0.01 で 0.02 (= 2s) / 単純せん断 g=0.02 で

0.02 (= g)。回転だけを取り除いた変形の強さなので、Q 基準や λ_ci と

合わせて見ると「渦かせん断か」が分かれる。

Detailed usage guide

• piv_displacement family guide

References (sample data, literature)

• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).

• Operator provenance and references — the sources of the research/methods this op family came from.

• The canonical algorithm (author, year) and its uses are named in the family usage guide above.

Runnable examples (verified samples that actually call this op)

• (none yet)

Ops the type connects to (they accept `image2d` as input)

piv_cross_correlate · piv_multipass · piv_deform_pass · strain_from_displacement · correlation_quality · speckle_quality

Same category (`field`)

piv_vorticity · piv_divergence · piv_flow_magnitude · piv_to_velocity · piv_velocity_gradient · piv_q_criterion · piv_swirling_strength

*Provenance: pivops.py — PIV operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*

piv_strain_rate — PIV field op