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Inner–outer interactions in a turbulent boundary layer overlying complex roughness

Gokul Pathikonda

Kenneth T. Christensen*

  • Department of Mechanical Science and Engineering, University of Illinois, Urbana-Champaign, Illinois, USA and Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana, USA

  • Aerospace and Mechanical Engineering; Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, Indiana, USA and International Institute for Carbon-Neutral Energy Research, Kyushu University, Fukuoka, Japan

  • *christensen.33@nd.edu
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Phys. Rev. Fluids 2, 044603 – Published 24 April, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.044603

Abstract

Hot-wire measurements were performed in a zero-pressure-gradient turbulent boundary layer overlying both a smooth and a rough wall for the purpose of investigating the details of inner–outer flow interactions. The roughness considered embodies a broad range of topographical scales arranged in an irregular manner and reflects the topographical complexity often encountered in practical flow systems. Single-probe point-wise measurements with a traversing probe were made at two different regions of the rough-wall flow, which was previously shown to be heterogeneous in the spanwise direction, to investigate the distribution of streamwise turbulent kinetic energy and large scale–small scale interactions. In addition, two-probe simultaneous measurements were conducted enabling investigation of inner–outer interactions, wherein the large scales were independently sampled in the outer layer. Roughness-induced changes to the near-wall behavior were investigated, particularly by contrasting the amplitude and frequency modulation effects of inner–outer interactions in the rough-wall flow with well-established smooth-wall flow phenomena. It was observed that the rough-wall flow exhibits both amplitude and frequency modulation features close to the wall in a manner very similar to smooth-wall flow, though the correlated nature of these effects was found to be more intense in the rough-wall flow. In particular, frequency modulation was found to illuminate these enhanced modulation effects in the rough-wall flow. The two-probe measurements helped in evaluating the suitability of the interaction-schematic recently proposed by Baars et al., Exp. Fluids 56, 1 (2015) for rough-wall flows. This model was found to be suitable for the rough-wall flow considered herein, and it was found that frequency modulation is a “cleaner” measure of the inner–outer modulation interactions for this rough-wall flow.

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Outline

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Phys. Rev. Fluids 2, 044603– Published 24 April, 2017
  • Received 19 December 2016
Article part of CHORUS

©2017 American Physical Society

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