Comparing leading and trailing edge vortex circulation history with vortex identification and tracking methods

Yangzi Huang; Melissa A Green

Comparing leading and trailing edge vortex circulation history with vortex identification and tracking methods

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The instantaneous circulation of vortices shed from an unsteady pitching panel is studied to reveal the formation and shedding processes of leading edge vortices (LEV). The analysis processes a large amount of data from the 2D simulation of a flat plate undergoing a 45° pitch-up maneuver. Large scale lift loss on the panel is shown to correlate with the vortex shedding. The Eulerian Γ₁ and Q criteria, and Lagrangian coherent structures (LCS) analysis including both finite-time Lyapunov exponent (FTLE) and Lagrangian-Averagcd Vorticity Deviation (LAVD) are all applied at the center and boundary of the LEV to identify the vortex dynamics. This is compared with a calculation of the circulation. The identified LEV dynamics revealed by multiple vortex criteria matches with the circulation development and lift history in time, indicating a consistent timing of LEV formation, growth, shedding, etc.

Original language	English (US)
Title of host publication	54th AIAA Aerospace Sciences Meeting
Publisher	American Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)	9781624103933
State	Published - 2016
Event	54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States Duration: Jan 4 2016 → Jan 8 2016

Other

Other	54th AIAA Aerospace Sciences Meeting, 2016
Country	United States
City	San Diego
Period	1/4/16 → 1/8/16

ASJC Scopus subject areas

Aerospace Engineering

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Huang, Y., & Green, M. A. (2016). Comparing leading and trailing edge vortex circulation history with vortex identification and tracking methods. In 54th AIAA Aerospace Sciences Meeting American Institute of Aeronautics and Astronautics Inc, AIAA.

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title = "Comparing leading and trailing edge vortex circulation history with vortex identification and tracking methods",

abstract = "The instantaneous circulation of vortices shed from an unsteady pitching panel is studied to reveal the formation and shedding processes of leading edge vortices (LEV). The analysis processes a large amount of data from the 2D simulation of a flat plate undergoing a 45° pitch-up maneuver. Large scale lift loss on the panel is shown to correlate with the vortex shedding. The Eulerian Γ1 and Q criteria, and Lagrangian coherent structures (LCS) analysis including both finite-time Lyapunov exponent (FTLE) and Lagrangian-Averagcd Vorticity Deviation (LAVD) are all applied at the center and boundary of the LEV to identify the vortex dynamics. This is compared with a calculation of the circulation. The identified LEV dynamics revealed by multiple vortex criteria matches with the circulation development and lift history in time, indicating a consistent timing of LEV formation, growth, shedding, etc.",

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year = "2016",

language = "English (US)",

isbn = "9781624103933",

booktitle = "54th AIAA Aerospace Sciences Meeting",

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note = "54th AIAA Aerospace Sciences Meeting, 2016 ; Conference date: 04-01-2016 Through 08-01-2016",

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AB - The instantaneous circulation of vortices shed from an unsteady pitching panel is studied to reveal the formation and shedding processes of leading edge vortices (LEV). The analysis processes a large amount of data from the 2D simulation of a flat plate undergoing a 45° pitch-up maneuver. Large scale lift loss on the panel is shown to correlate with the vortex shedding. The Eulerian Γ1 and Q criteria, and Lagrangian coherent structures (LCS) analysis including both finite-time Lyapunov exponent (FTLE) and Lagrangian-Averagcd Vorticity Deviation (LAVD) are all applied at the center and boundary of the LEV to identify the vortex dynamics. This is compared with a calculation of the circulation. The identified LEV dynamics revealed by multiple vortex criteria matches with the circulation development and lift history in time, indicating a consistent timing of LEV formation, growth, shedding, etc.

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