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        "description": "This is numerical evidence for a particular truncated, drag-modified flow, not a proof of universal behavior of all wall-bounded or channel flows. The streamwise gap distribution near the chosen threshold did not exhibit the expected extended power law; the authors used an alternative correlation-length comparison and suggested finite distance from criticality. Some data collapses use directed-percolation exponents, and exponent relations make several comparisons non-independent. Threshold and exponent come from selected fits, not exact infinite-time results. The supplementary movie, raw simulations and independent fit replay were not examined.",
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      "statement": "# Large-domain shear-flow simulation and turbulence-transition scaling\n\nChantry, Tuckerman and Barkley simulated large domains of stress-free, sinusoidally forced Waleffe shear flow using four wall-normal modes. Near a fitted transition they found a growing turbulent fraction and gap statistics broadly consistent with directed-percolation scaling. A smaller simulated domain instead displayed long-lived transients and an apparent jump, illustrating how finite size can change the observed transition.\n\n## Scientific scope\n\nThis is numerical evidence for a particular truncated, drag-modified flow, not a proof of universal behavior of all wall-bounded or channel flows. The streamwise gap distribution near the chosen threshold did not exhibit the expected extended power law; the authors used an alternative correlation-length comparison and suggested finite distance from criticality. Some data collapses use directed-percolation exponents, and exponent relations make several comparisons non-independent. Threshold and exponent come from selected fits, not exact infinite-time results. The supplementary movie, raw simulations and independent fit replay were not examined.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nMatthew Chantry; Laurette S. Tuckerman; Dwight Barkley\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Universal continuous transition to turbulence in a planar shear flow](https://warwick.ac.uk/fac/sci/maths/people/staff/dwight_barkley/home_page/papers/chantry_-_2017_-_journal_of_fluid_mechanics.pdf)\n",
      "summary": "Chantry, Tuckerman and Barkley simulated large domains of stress-free, sinusoidally forced Waleffe shear flow using four wall-normal modes. Near a fitted transition they found a growing turbulent fraction and gap statistics broadly consistent with directed-percolation scaling. A smaller simulated domain instead displayed long-lived transients and an apparent jump, illustrating how finite size can change the observed transition.",
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    "what_changed": "Chantry, Tuckerman and Barkley simulated large domains of stress-free, sinusoidally forced Waleffe shear flow using four wall-normal modes. Near a fitted transition they found a growing turbulent fraction and gap statistics broadly consistent with directed-percolation scaling. A smaller simulated domain instead displayed long-lived transients and an apparent jump, illustrating how finite size can change the observed transition.",
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