{
  "abstract": "I show that the initial conditions imposed by Balan [Phys. Fluids 35, 113108 (2023)] are incompatible with a nonzero retardation time, so that the problem solved is not impulsive start-up, but, as I prove exactly, the start-up of a plate ramped as $1 - \\mathrm{e}^{-t/λ_2}$ on the retardation timescale $λ_2$ (a material parameter, not a setting in a rheometer). Values digitized from that paper's viscoelastic figures fall on the ramped-plate solution, not on Tanner's start-up solution. The large negative wall normal stress reported for the corotational model is a grid-dependent artifact due to the same error in the initial data. An open-source code repository provides annotated notebooks reproducing every figure and number in this Comment.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.30359",
  "author_total": 1,
  "authors": [
    {
      "name": "Ivan C. Christov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fa8h4evfhsvqz.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.30359",
  "fulltext_url": null,
  "id": "fa8h4evfhsvqz",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.30359",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.soft"
    ],
    [
      "arxiv",
      "physics.flu-dyn"
    ],
    [
      "openalex",
      "1507|Rheology and Fluid Dynamics Studies"
    ]
  ],
  "openalex": "W7214575001",
  "pdf_url": "https://arxiv.org/pdf/2609.30359",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fa8h4evfhsvqz.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.30359",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.30359"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.soft",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.flu-dyn",
      "subfield": "fluid-dynamics"
    }
  ],
  "title": "Comment on \"Note on the start-up of Couette flow for viscoelastic fluids\" [Phys. Fluids 35, 113108 (2023)]",
  "title_text": "Comment on \"Note on the start-up of Couette flow for viscoelastic fluids\" [Phys. Fluids 35, 113108 (2023)]",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/fa8h4evfhsvqz",
  "venue": "arXiv",
  "versions": []
}