{
  "abstract": "This study uses wall-resolved large-eddy simulations to investigate bypass transition in a flat-plate boundary layer subjected to free-stream turbulence. Two thermal configurations are considered: an adiabatic wall and a uniformly cooled wall. The plate geometry includes an elliptic leading edge and is designed for direct experimental reproduction, providing a framework for future numerical-experimental comparisons. The resolved leading edge allows direct examination of the early stages of bypass transition. Both simulations recover the classical sequence of receptivity, vortex tilting, lift-up, streak amplification, secondary instability and turbulent-spot growth. The wall-normal transport term is identified as a precursor of streak formation, while shear sheltering is quantified and linked to the frequency-dependent penetration of free-stream disturbances into the boundary layer. Wall cooling does not modify the bypass-transition mechanisms nor the onset location of transition. Instead, it generates thermal streaks alongside the velocity streaks and shifts the latter slightly closer to the wall, consistent with optimal-perturbation predictions. The velocity streaks retain similar amplitudes, growth rates and spanwise spacings in both thermal conditions. A conditional analysis reveals a pronounced asymmetry between high- and low-velocity streaks. Although breakdown is systematically observed within low-velocity streaks, the strongest pre-transitional evolution occurs within the high-velocity streak population, which undergoes significant amplification and a progressive displacement towards the wall before the onset of intermittency. These observations suggest that high-velocity streaks may actively contribute to the reorganisation of the streak field leading to secondary instability and breakdown.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.24690",
  "author_total": 3,
  "authors": [
    {
      "name": "Adèle Veilleux"
    },
    {
      "name": "Hugues Deniau"
    },
    {
      "name": "Olivier Vermeersch"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d7ph3zv3c8y3t.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.24690",
  "fulltext_url": null,
  "id": "d7ph3zv3c8y3t",
  "issns": [],
  "landing_url": "https://hal.science/hal-05753730v1",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.class-ph"
    ],
    [
      "hal",
      "0.phys"
    ],
    [
      "hal",
      "1.phys.meca"
    ],
    [
      "hal",
      "2.phys.meca.mefl"
    ],
    [
      "openalex",
      "2206|Fluid Dynamics and Turbulent Flows"
    ]
  ],
  "openalex": "W7214007140",
  "pdf_url": "https://hal.science/hal-05753730/document",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/d7ph3zv3c8y3t.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:36Z",
      "native_id": "hal-05753730",
      "source": "hal",
      "url": "https://hal.science/hal-05753730v1"
    },
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.24690",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.24690"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "hal:2.phys.meca.mefl",
      "subfield": "fluid-dynamics"
    }
  ],
  "title": "Bypass transition under wall cooling over a flat plate with an elliptical leading edge",
  "title_text": "Bypass transition under wall cooling over a flat plate with an elliptical leading edge",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/d7ph3zv3c8y3t",
  "venue": "HAL",
  "versions": []
}