{
  "id": "1711.07054",
  "version": "v1",
  "published": "2017-11-19T17:22:24.000Z",
  "updated": "2017-11-19T17:22:24.000Z",
  "title": "Energy transfer in turbulence under rotation",
  "authors": [
    "Michele Buzzicotti",
    "Hussein Aluie",
    "Luca Biferale",
    "Moritz Linkmann"
  ],
  "categories": [
    "physics.flu-dyn"
  ],
  "abstract": "It is known that rapidly rotating turbulent flows are characterized by the emergence of simultaneous upscale and downscale energy transfer. Indeed, both numerics and experiments show the formation of large-scale anisotropic vortices together with the development of small-scale dissipative structures. However the organization of interactions leading to this complex dynamics remains unclear. Two different mechanisms are known to be able to transfer energy upscale in a turbulent flow. The first is characterized by 2-dimensional interactions amongst triads lying on the 2D3C/slow manifold, namely on the Fourier-plane perpendicular to the rotation axis. The second mechanism is 3-dimensional and consists of interactions between triads with the same sign of helicity (homo-chiral). Here, we present a detailed numerical study of rotating flows using a suite of high Reynolds number direct numerical simulations (DNS) within different parameter regimes to analyze both upscale and downscale cascade ranges. We find that the upscale cascade at wave-numbers close to the forcing scale is generated by increasingly dominant homo-chiral interactions which couple the 3-dimensional bulk and the 2D3C plane. This coupling produces an accumulation of energy in the 2D3C plane, which then transfers energy to smaller wave-numbers thanks to the 2-dimensional mechanism. In the forward cascade range, we find that the energy transfer is dominated by hetero-chiral triads and is dominated primarily by interaction within the fast manifold where $k_z\\ne 0$. We further analyze the energy transfer in different regions in the real-space domain. In particular we distinguish high-strain from high-vorticity regions and we uncover that while the mean transfer is produced inside regions of strain, the rare but extreme events of energy transfer occur primarily inside the large-scale column vortices.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-11-19T17:22:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "interaction",
      "2d3c plane",
      "reynolds number direct numerical simulations",
      "energy transfer occur primarily inside",
      "turbulence"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}