{
  "abstract": "We study coherent structures extracted from time-resolved particle image velocimetry (TR-PIV) measurements of isothermal elliptical jets with aspect ratio of 1:2, at Mach numbers 0.4 and 0.7. The velocity snapshots are decomposed according to the D$_2$ symmetry. Spectral proper orthogonal decomposition (SPOD) is then used to identify coherent structures. Modelling is performed using three-dimensional parabolised stability equations (3D-PSE) based on linearisation about the time-averaged mean flows. A comparison between SPOD and 3D-PSE results shows alignment of SPOD and single-mode PSE structures of up to 70\\%. A linear combination of PSE solutions, obtained from the family of initially unstable local modes, leads to SPOD-PSE alignment of up to 90\\%. Limitations are observed at low frequencies and near the nozzle and are attributed to the existence of non-modal amplification mechanisms. The study shows that coherent structures in turbulent elliptical jets can be educed using the D$_2$-SPOD approach, and modelled using 3D PSE.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.28221",
  "author_total": 6,
  "authors": [
    {
      "name": "Filipe Ramos do Amaral"
    },
    {
      "name": "Mateus Peixoto Avanci"
    },
    {
      "name": "Jean-Christophe Robinet"
    },
    {
      "name": "Peter Jordan"
    },
    {
      "name": "Jérôme Huber"
    },
    {
      "name": "Grégoire Pont"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cfcxxm4rg7w1e.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.28221",
  "fulltext_url": null,
  "id": "cfcxxm4rg7w1e",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.28221",
  "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",
      "2206|Fluid Dynamics and Turbulent Flows"
    ]
  ],
  "openalex": "W7223083250",
  "pdf_url": "https://arxiv.org/pdf/2610.28221",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cfcxxm4rg7w1e.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2610.28221",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.28221"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.flu-dyn",
      "subfield": "fluid-dynamics"
    }
  ],
  "title": "Wavepackets in subsonic elliptical jets: coherent-structure eduction and linear modelling",
  "title_text": "Wavepackets in subsonic elliptical jets: coherent-structure eduction and linear modelling",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/cfcxxm4rg7w1e",
  "venue": "arXiv",
  "versions": []
}