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Formation of power-law scalings of spectra and multiscale coherent structures in the near-field of grid-generated turbulence

Tatsuya Yasuda1,*, Susumu Goto2,†, and John Christos Vassilicos1,‡

  • 1Turbulence, Mixing and Flow Control Group, Department of Aeronautics, Imperial College London, United Kingdom
  • 2Graduate School of Engineering Science, Osaka University, Japan

  • *Current address: Department of Physical Science and Engineering, Nagoya Institute of Technology, Japan; yasuda.tatsuya@nitech.ac.jp
  • goto@me.es.osaka-u.ac.jp
  • Current address: Univ. Lille, CNRS, ONERA, Arts et Métiers ParisTech, Centrale Lille, FRE 2017 - LMFL - Laboratoire de Mécanique des fluides de Lille - Kampé de Feriet, F-59000 Lille, France; john-christos.vassilicos@centralelille.fr

Phys. Rev. Fluids 5, 014601 – Published 13 January, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.014601

Abstract

We investigate the streamwise evolutions of energy and pressure spectra along the shear-layer region of very near-field grid-generated turbulence. The energy and pressure spectra evolve significantly in this near-field. The shear-layer and vortex-shedding frequencies appear immediately in different spectra but the shear-layer's spectral signature is very soon replaced by a broad power-law spectrum on both sides of that frequency. The spectra evolve further by filling the gap between the vortex shedding and the shear-layer frequencies eventually leading to near 5/3 power-law energy spectra at the point on the shear-layer region where the turbulence intensity reaches a maximum. The pressure spectrum reaches a 7/3 power-law shape significantly further downstream. These spectral scalings cover a range between the vortex-shedding frequency and frequencies larger than the shear-layer frequency. They are discussed in relation to turbulent coherent structures of various sizes, obtained by using Gaussian low-pass filtering of instantaneous turbulent flow fields. High enstrophy small-scale structures originate from the shear-layer instability whereas low enstrophy large-scale structures originate from the vortex shedding. The generation of near-field 5/3 energy and 7/3 pressure spectra involves cooperative interactions between these two different size structures.

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