An analysis of the unsteady wake behind a circular cylinder using lagrangian coherent structures

Matthew P. Rockwood, Jacob Morrida, Melissa A. Green

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

1 Scopus citations

Abstract

The unsteady wake behind a circular cylinder was experimentally measured and com- pared with numerical results. The location and evolution of coherent structures, or vortices, in the flow were analyzed to facilitate the understanding of the complex vortex shedding physics in the near wake region. Two-dimensional phase averaged velocity data was collected using a 2D DPIV measurement system for multiple Reynolds numbers and cylinder diameters. The Eulerian Q-criterion, along with a Lagrangian coherent structures (LCS) analysis, was applied to the numerical and experimental data to determine the properties of the wake. An FTLE strain restriction was applied to the LCS to filter out ridges that identify regions of shear instead of hyperbolic separation. The strain restriction exposes the loss of hyperbolicity of the LCS, causing a break in the material line, as a new vortex begins to form behind the cylinder.

Original languageEnglish (US)
Title of host publication52nd Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Electronic)9781624102561
DOIs
StatePublished - 2014
Event52nd Aerospace Sciences Meeting 2014 - National Harbor, United States
Duration: Jan 13 2014Jan 17 2014

Publication series

Name52nd Aerospace Sciences Meeting

Other

Other52nd Aerospace Sciences Meeting 2014
CountryUnited States
CityNational Harbor
Period1/13/141/17/14

ASJC Scopus subject areas

  • Aerospace Engineering

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    Rockwood, M. P., Morrida, J., & Green, M. A. (2014). An analysis of the unsteady wake behind a circular cylinder using lagrangian coherent structures. In 52nd Aerospace Sciences Meeting (52nd Aerospace Sciences Meeting). American Institute of Aeronautics and Astronautics Inc.. https://doi.org/10.2514/6.2014-0053