Flow structure identification in the near wake of a supersonic separated flow using FAEMD

Matthew D. Koll, Austin P. Scott, Gregory S. Elliott, J. Craig Dutton

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


The supersonic separated flowfield aft of a blunt-faced cylinder aligned with the freestream is highly complex such that a technique able to identify instantaneous turbulent structure within it is valuable. In this study, multi-dimensional extensions of fast and adaptive empirical mode decomposition (FAEMD) are implemented on both three-component planar and volumetric velocity fields of said flowfield, obtained using particle image velocimetry. The resulting two-dimensional intrinsic mode functions revealed the various length scales associated with different regions of the flowfield. Coherent streamwise-oriented structures of different scales were detected throughout the flowfield that indicate the presences of quasi-streamwise vortices. The presence of sharply angled structures, at about 45º to the local flow direction, suggests that both conventional-and counter-hairpin vortices are present within the flowfield, especially in the recompression zone and trailing wake.

Original languageEnglish (US)
Title of host publication2018 Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105531
StatePublished - 2018
Event48th AIAA Fluid Dynamics Conference, 2018 - Atlanta, United States
Duration: Jun 25 2018Jun 29 2018

Publication series

Name2018 Fluid Dynamics Conference


Other48th AIAA Fluid Dynamics Conference, 2018
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering
  • Engineering (miscellaneous)


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