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Comment on “Evolution of wall shear stress with Reynolds number in fully developed turbulent channel flow experiments”

R. Örlü* and P. Schlatter†

  • SimEx/FLOW, Engineering Mechanics, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden

  • *ramis@mech.kth.se
  • †pschlatt@mech.kth.se
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Phys. Rev. Fluids 5, 127601 – Published 30 December, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.127601

Abstract

The recent study by Gubian et al. [Phys. Rev. Fluids 4, 074606 (2019)], based on a new wall-shear-stress sensor in a low-Reynolds-number Re turbulent channel flow, came to the surprising conclusion that the magnitude of the fluctuating wall-shear stress τw,rms+ reaches an asymptotic value of 0.44 beyond the friction Reynolds number Reτ≈600. This statement is at odds with results from well-established direct numerical simulation (DNS) results that exceed the authors' highest Reynolds number by up to a factor of 5 while exhibiting a clear Reynolds-number dependence. Furthermore, they claim that “prior estimates of these quantities did not resolve the full range of wall-shear-stress fluctuations, which extended beyond 10 standard deviations above the mean.” This contradicts high-quality DNS results and calls for a more in-depth explanation, which is given in the present Comment. We shows that the measurements by Gubian et al. suffer from spatial-resolution issues among others, which when accounted for invalidate the statements made of an asymptotic state at Reτ≈600 and resurrects the Reynolds-number dependence of τw,rms+ for which DNS evidence exists exceeding Reτ≈600 by an order of magnitude.

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Comments & Replies

Reply to “Comment on ‘Evolution of wall shear stress with Reynolds number in fully developed turbulent channel flow experiments' ”

Pierre-Alain Gubian, Jordan Stoker, James Medvescek, Laurent Mydlarski, and B. Rabi Baliga
Phys. Rev. Fluids 5, 127602 (2020)

Article Text

Original Article

Evolution of wall shear stress with Reynolds number in fully developed turbulent channel flow experiments

Pierre-Alain Gubian, Jordan Stoker, James Medvescek, Laurent Mydlarski, and B. Rabi Baliga
Phys. Rev. Fluids 4, 074606 (2019)

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Outline

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Phys. Rev. Fluids 5, 127601– Published 30 December, 2020
  • Received 6 August 2019
  • Accepted 3 November 2020
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