Tracking coherent structures in massively-separated and turbulent flows

Yangzi Huang, Matthew Rockwood, Melissa A Green

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Coherent structures are tracked in three simulations of massive-separated or turbulent flow. Topological saddle points are found using intersections of the postiveand negative-time Lagrangian coherent structures, and these points are then followed as the flow evolves in order to track individual structures. In the cases of a 2D flat plate undergoing a 45° pitch-up maneuver and a circular cylinder in cross-flow, tracking saddle points showed a rapid acceleration of the structure as it shed from the plate or cylinder surface. For a simulation of wall-bounded turbulence in a channel flow, tracking the LCS saddle points shows that average structure convection speed exhibits a similar trend as a function of wall-normal distance as the mean velocity profile.

Original languageEnglish (US)
Title of host publication9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
PublisherTSFP-9
Volume1
ISBN (Electronic)9780000000002
StatePublished - Jan 1 2015
Event9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 - Melbourne, Australia
Duration: Jun 30 2015Jul 3 2015

Other

Other9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
CountryAustralia
CityMelbourne
Period6/30/157/3/15

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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  • Cite this

    Huang, Y., Rockwood, M., & Green, M. A. (2015). Tracking coherent structures in massively-separated and turbulent flows. In 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 (Vol. 1). TSFP-9.