{
  "annotation_id": "b3e05d6a-a2a5-4225-9b3d-9a47862e0e15",
  "date_created": "2026-03-02T18:00:29.152000Z",
  "date_modified": "2026-03-02T18:00:29.152000Z",
  "file_hash": "02d3d6e98c0df27f81faf635d23068cd515d863b87eaff7e7e20969138426185",
  "private": false,
  "record": {
    "abstract": "We report experimental observation of a localized structure, which is of a\nnew type for dissipative systems. It appears as a solitary vortex couple\n(\"diwhirl\") in Couette flow with highly elastic polymer solutions. A unique\nproperty of the diwhirls is that they are stationary, in contrast to the usual\nlocalized wave structures in both Hamiltonian and dissipative systems which are\nstabilized by wave dispersion. It is also a new object in fluid dynamics - a\ncouple of vortices that build a single entity somewhat similar to a magnetic\ndipole. The diwhirls arise as a result of a purely elastic instability through\na hysteretic transition at negligible Reynolds numbers. It is suggested that\nthe vortex flow is driven by the same forces that cause the Weissenberg effect.\nThe diwhirls have a striking asymmetry between the inflow and outflow, which is\nalso an essential feature of the suggested elastic instability mechanism.",
    "arxiv_id": "patt-sol/9610008",
    "authors": [
      "Alexander Groisman",
      "Victor Steinberg"
    ],
    "categories": [
      "patt-sol",
      "nlin.PS"
    ],
    "doi": "10.1103/PhysRevLett.78.1460",
    "title": "Solitary vortex couples in viscoelastic Couette flow",
    "url": "https://arxiv.org/abs/patt-sol/9610008"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4eb0adc9-4754-468d-b7b6-493e98ca3704",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}