{
  "abstract": "We investigate the instability of streaks induced by free-stream vortical disturbances in cooled-wall high-supersonic boundary layers. Distinct types of instability modes are identified: modified Mack second modes, a newly discovered varicose secondary-instability mode and sinuous or varicose secondary-instability modes akin to those in incompressible boundary layers. Unique characteristics of the new secondary-instability mode are that its eigenfunctions concentrate in high-speed valley regions near the wall and feature intense temperature fluctuations at the wall. The streaks in high-supersonic boundary layers destabilise the three-dimensional secondary-instability modes, but suppress the growth of the modified Mack second modes, both radiating and non-radiating. The suppression of radiating modes amounts to a reduction of the two-dimensional noise they emit. Numerical results indicate that, unlike streaks in adiabatic-wall boundary layers, whose instability concentrates in low-speed peak regions away from the wall, the secondary instability of streaks in cooled-wall high-supersonic boundary layers occurs both in low-speed peak regions and in high-speed valley regions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.00846",
  "author_total": 4,
  "authors": [
    {
      "name": "Dongdong Xu"
    },
    {
      "name": "Pierre Ricco"
    },
    {
      "name": "Elena Marensi"
    },
    {
      "name": "Xuesong Wu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0yzzntb3kdzbb.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.00846",
  "fulltext_url": null,
  "id": "0yzzntb3kdzbb",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.00846",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "physics.flu-dyn"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.00846",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-01",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0yzzntb3kdzbb.ris",
  "sources": [
    {
      "first_seen": "2026-11-03T12:20:59Z",
      "native_id": "2611.00846",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.00846"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.flu-dyn",
      "subfield": "fluid-dynamics"
    }
  ],
  "title": "Instability of streaky high-supersonic boundary layers over cooled walls",
  "title_text": "Instability of streaky high-supersonic boundary layers over cooled walls",
  "type": "preprint",
  "updated_at": "2026-11-07T18:20:05Z",
  "url": "https://research.draconitic.com/paper/0yzzntb3kdzbb",
  "venue": "arXiv",
  "versions": []
}