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Comment on “Effect of viscous-convective subrange on passive scalar statistics at high Reynolds number”

Dhawal Buaria1,2,* and Katepalli R. Sreenivasan1,3

  • 1Tandon School of Engineering, New York University, New York, New York 11201, USA
  • 2Max Planck Institute for Dynamics and Self-Organization, 37077 Göttingen, Germany
  • 3Department of Physics and the Courant Institute of Mathematical Sciences, New York University, New York, New York 10012, USA

  • *dhawal.buaria@nyu.edu
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Phys. Rev. Fluids 8, 097601 – Published 5 September, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.097601

Abstract

Recently, Shete et al. [Phys. Rev. Fluids 7, 024601 (2022)] explored the characteristics of passive scalars in the presence of a uniform mean gradient, mixed by stationary isotropic turbulence. They concluded that at high Reynolds and Schmidt numbers, the presence of both inertial-convective and viscous-convective ranges renders the statistics of the scalar and velocity fluctuations to behave similarly. However, their data included Schmidt numbers of 0.1, 0.7, 1.0, and 7.0, only the last of which can (at best) be regarded as moderately high. Additionally, they do not consider already available data in the literature at substantially higher Schmidt number of up to 512. By including these data, we demonstrate here that the differences between velocity and scalar statistics show no vanishing trends with increasing Reynolds and Schmidt numbers, and essential differences remain intact at all Reynolds and Schmidt numbers.

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Original Article

Effect of viscous-convective subrange on passive scalar statistics at high Reynolds number

Kedar Prashant Shete, David J. Boucher, James J. Riley, and Stephen M. de Bruyn Kops
Phys. Rev. Fluids 7, 024601 (2022)

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Phys. Rev. Fluids 8, 097601– Published 5 September, 2023
  • Received 28 July 2022
  • Accepted 18 August 2023
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