{
  "id": "1701.08996",
  "version": "v1",
  "published": "2017-01-31T11:22:46.000Z",
  "updated": "2017-01-31T11:22:46.000Z",
  "title": "The onset of turbulent rotating dynamos at the low $Pm$ limit",
  "authors": [
    "Kannabiran Seshasayanan",
    "Vassilios Dallas",
    "Alexandros Alexakis"
  ],
  "comment": "5 pages, 6 figures",
  "categories": [
    "physics.flu-dyn",
    "astro-ph.EP",
    "astro-ph.SR",
    "physics.geo-ph"
  ],
  "abstract": "We demonstrate that the critical magnetic Reynolds number $Rm_c$ for a turbulent non-helical dynamo in the low magnetic Prandtl number $Pm$ limit (i.e. $Pm = Rm/Re \\ll 1$) can be significantly reduced if the flow is submitted to global rotation. Even for moderate rotation rates the required energy injection rate can be reduced by a factor more than $10^3$. This strong decrease of the onset is attributed to the reduction of the turbulent fluctuations that makes the flow to have a much larger cut-off length-scale compared to a non-rotating flow of the same Reynolds number. The dynamo thus behaves as if it is driven by laminar behaviour (i.e. high $Pm$ behaviour) even at high values of the Reynolds number (i.e. at low values of $Pm$). Our finding thus points into a new paradigm for the design of new liquid metal dynamo experiments.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-01-31T11:22:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "turbulent rotating dynamos",
      "low magnetic prandtl number",
      "liquid metal dynamo experiments",
      "energy injection rate",
      "moderate rotation rates"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}