Multi-scale geometry of flow structures in a flat-plate turbulent boundary layer

ORAL

Abstract

We study the geometry of structures educed from the enstrophy and dissipation fields obtained from a DNS of a flat-plate turbulent boundary layer (J. Fluid Mech. 630, 5-41, 2009) following the non-local multi-scale methodology introduced in J. Fluid Mech. 603, 101-135, 2008. We compare the results with those of homogeneous isotropic turbulence. In the present analysis, geometric parameters are combined with physical quantities associated with the flow structures. Their evolution in time is studied through a series of snapshots obtained from the simulation, following a moving subdomain. Individual structures are tracked in time, relating their physical and geometric properties at the local and structure levels. The validity of two local identification criteria for the eduction of vortex tubes and sheets in wall-bounded flows is also evaluated.

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Authors

  • Ivan Bermejo-Moreno

    Center for Turbulence Research, Stanford University

  • Callum Atkinson

    Laboratory for Turbulence Research in Aerospace and Combustion, Monash University, Australia, Laboratory for Turbulence Research in Aerospace and Combustion, Monash University

  • Sergei Chumakov

    Center for Turbulence Research, Stanford University

  • Julio Soria

    Department of Mechanical and Aerospace Engineering, Monash University, Australia, LTRAC, Monash University, Laboratory for Turbulence Research in Aerospace \& Combustion, Monash University, Laboratory for Turbulence Research in Aerospace and Combustion, Monash University

  • Xiaohua Wu

    Royal Military College of Canada, Royal Military Colllege of Canada