{
  "annotation_id": "47d762c0-1b68-43c2-be8e-edc558c694f1",
  "date_created": "2026-03-02T18:01:17.706000Z",
  "date_modified": "2026-03-02T18:01:17.706000Z",
  "file_hash": "4efd5f72260ce3cc2a8cb66da683af509938b1256961dd5eb56d2c49fae68c19",
  "private": false,
  "record": {
    "abstract": "Dynamo action in a fully helical Beltrami (ABC) flow is studied using both\ndirect numerical simulations and subgrid modeling. Sufficient scale separation\nis given in order to allow for large-scale magnetic energy build-up. Growth of\nmagnetic energy obtains down to a magnetic Prandtl number PM=RM/RV close to\n0.005, where RV and RM are the kinetic and magnetic Reynolds numbers. The\ncritical magnetic Reynolds number for dynamo action RMc seems to saturate at\nvalues close to 20. Detailed studies of the dependence of the amplitude of the\nsaturated magnetic energy with PM are presented. In order to decrease PM,\nnumerical experiments are conducted with either RV or RM kept constant. In the\nformer case, the ratio of magnetic to kinetic energy saturates to a value\nslightly below unity as PM decreases. Examination of energy spectra and\nstructures in real space both reveal that quenching of the velocity by the\nlarge-scale magnetic field takes place, with an inverse cascade of magnetic\nhelicity and a force-free field at large scale in the saturated regime.",
    "arxiv_id": "physics/0702109",
    "authors": [
      "P. D. Mininni"
    ],
    "categories": [
      "physics.flu-dyn",
      "physics.plasm-ph"
    ],
    "doi": "10.1103/PhysRevE.76.026316",
    "title": "Inverse cascades and alpha-effect at low magnetic Prandtl number",
    "url": "https://arxiv.org/abs/physics/0702109"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d1482ee7-4df5-4763-a3bd-45324c97db75",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}