A self-sustaining process model of inertial layer dynamics in high Reynolds number turbulent wall flows.

Academic Article

Abstract

  • Field observations and laboratory experiments suggest that at high Reynolds numbers Re the outer region of turbulent boundary layers self-organizes into quasi-uniform momentum zones (UMZs) separated by internal shear layers termed 'vortical fissures' (VFs). Motivated by this emergent structure, a conceptual model is proposed with dynamical components that collectively have the potential to generate a self-sustaining interaction between a single VF and adjacent UMZs. A large-Re asymptotic analysis of the governing incompressible Navier-Stokes equation is performed to derive reduced equation sets for the streamwise-averaged and streamwise-fluctuating flow within the VF and UMZs. The simplified equations reveal the dominant physics within-and isolate possible coupling mechanisms among-these different regions of the flow.This article is part of the themed issue 'Toward the development of high-fidelity models of wall turbulence at large Reynolds number'.
  • Authors

  • Chini, Gregory
  • Montemuro, B
  • White, Christopher
  • Klewicki, J
  • Status

    Publication Date

  • March 13, 2017
  • Keywords

  • asymptotic analysis
  • self-sustaining process
  • turbulent wall flows
  • Digital Object Identifier (doi)

    Start Page

  • 20160090
  • End Page

  • 20160090
  • Volume

  • 375
  • Issue

  • 2089