The three-dimensional structures in turbulent Couette-Poiseuille flows on the verge of separation

Zehuan Wu, Callum Atkinson, Julio Soria, Atsushi Sekimoto

Research output: Contribution to conferencePaperpeer-review

Abstract

This work investigates flow structures in Couette-Poiseuille (C-P) flows with the adverse pressure gradient (APG) adjusted to create zero mean skin friction on the stationary wall. The vortical structures are identified as regions with a positive value of the discriminant of the velocity gradient tensor (Chong et al., 1990; Soria et al., 1994). The data used in current study are from direct numerical simulation (DNS). The enstrophy density and the dissipation of kinetic energy carried by flow structures are instigated by examining the second invariants of the symmetric strain rate tensor Si j and the skew-symmetric rate of rotation tensor Wi j (Chong et al. (1998)). Some characterizations of the topological flow structures in the near-wall region are similar to a viscous sub-layer in channel flows (Blackburn et al., 1996).

Original languageEnglish
Publication statusPublished - 2019
Externally publishedYes
Event11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019 - Southampton, United Kingdom
Duration: Jul 30 2019Aug 2 2019

Conference

Conference11th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2019
Country/TerritoryUnited Kingdom
CitySouthampton
Period7/30/198/2/19

ASJC Scopus subject areas

  • Atmospheric Science
  • Aerospace Engineering

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