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 conferencePaper

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 - 1 Jan 2019
EventTurbulence and Shear Flow Phenomena 2019 - Southampton, United Kingdom
Duration: 30 Jul 20192 Aug 2019
Conference number: 11th
http://tsfp11.org/

Conference

ConferenceTurbulence and Shear Flow Phenomena 2019
Abbreviated titleTSFP 2019
CountryUnited Kingdom
CitySouthampton
Period30/07/192/08/19
Internet address

Cite this

Wu, Z., Atkinson, C., Soria, J., & Sekimoto, A. (2019). The three-dimensional structures in turbulent Couette-Poiseuille flows on the verge of separation. Paper presented at Turbulence and Shear Flow Phenomena 2019, Southampton, United Kingdom.