76th Annual Meeting of the APS Division of Fluid Dynamics (November 19, 2023 — November 21, 2023)

V0080: Spinning pipes

  • Maochao Xiao, Sapienza Università di Roma
  • Alessandro Ceci, Sapienza Università di Roma
  • Paolo Orlandi, Sapienza Università di Roma
  • Sergio Pirozzoli, Sapienza Università di Roma
DOI: https://doi.org/10.1103/APS.DFD.2023.GFM.V0080

Spinning reduces wall friction drag in pipeline flows, which can ultimately lower pumping power required for the transport of liquid/gas. We present flow animations derived from direct numerical simulations (DNS) of spinning pipe turbulent flows up to friction Reynolds number Re_{\tau} = 3020. The flow visualizations show that rotation stabilizes turbulence in both the near-wall and pipe core regions at the high Reynolds numbers. The near-wall ejections and sweeps are significantly suppressed, resulting in weaker and wider streaks. As the rotational speed increases, the ramp-like structures observed in the pipe midplane gradually disappear, replaced by a columnar structure residing along the pipe axis. Meanwhile, the ejections of low-speed fluid from the pipe wall become tilted towards the opposite direction of rotation.

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