Leading edge vortex separation study by different vortex and flow separation identification methods

Yangzi Huang; Melissa A Green

Leading edge vortex separation study by different vortex and flow separation identification methods

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

Abstract

The separation process of leading edge vortices (LEV) from an unsteady pitching plate is studied. The analysis processes a large amount of data from the two dimensional (2D) simulation of a at plate undergoing a 45° pitch-up maneuver. Large scale lift loss on the plate is shown to correlate with the vortex shedding. A Lagrangian coherent structures (LCS) analysis, including hyperbolic LCSs, Lagrangian-Averaged Vorticity Deviation (LAVD), and both FTLE saddle and λ-saddle are all applied around the LEV to identify the vortex dynamics. This is compared with a calculation of the circulation and the vortex shedding mechanism (VSM). The identified LEV dynamics revealed by multiple vortex criteria match with the circulation development and lift history in time, suggesting that LEV separation is a good model for various vortex shedding mechanisms.

Original language	English (US)
Title of host publication	8th AIAA Theoretical Fluid Mechanics Conference, 2017
Publisher	American Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)	9781624104978
State	Published - Jan 1 2017
Event	8th AIAA Theoretical Fluid Mechanics Conference, 2017 - Denver, United States Duration: Jun 5 2017 → Jun 9 2017

Other

Other	8th AIAA Theoretical Fluid Mechanics Conference, 2017
Country	United States
City	Denver
Period	6/5/17 → 6/9/17

ASJC Scopus subject areas

Mechanical Engineering
Mechanics of Materials
Condensed Matter Physics

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title = "Leading edge vortex separation study by different vortex and flow separation identification methods",

abstract = "The separation process of leading edge vortices (LEV) from an unsteady pitching plate is studied. The analysis processes a large amount of data from the two dimensional (2D) simulation of a at plate undergoing a 45° pitch-up maneuver. Large scale lift loss on the plate is shown to correlate with the vortex shedding. A Lagrangian coherent structures (LCS) analysis, including hyperbolic LCSs, Lagrangian-Averaged Vorticity Deviation (LAVD), and both FTLE saddle and λ-saddle are all applied around the LEV to identify the vortex dynamics. This is compared with a calculation of the circulation and the vortex shedding mechanism (VSM). The identified LEV dynamics revealed by multiple vortex criteria match with the circulation development and lift history in time, suggesting that LEV separation is a good model for various vortex shedding mechanisms.",

author = "Yangzi Huang and Green, {Melissa A}",

year = "2017",

month = jan,

day = "1",

language = "English (US)",

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booktitle = "8th AIAA Theoretical Fluid Mechanics Conference, 2017",

publisher = "American Institute of Aeronautics and Astronautics Inc, AIAA",

note = "8th AIAA Theoretical Fluid Mechanics Conference, 2017 ; Conference date: 05-06-2017 Through 09-06-2017",

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AU - Green, Melissa A

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N2 - The separation process of leading edge vortices (LEV) from an unsteady pitching plate is studied. The analysis processes a large amount of data from the two dimensional (2D) simulation of a at plate undergoing a 45° pitch-up maneuver. Large scale lift loss on the plate is shown to correlate with the vortex shedding. A Lagrangian coherent structures (LCS) analysis, including hyperbolic LCSs, Lagrangian-Averaged Vorticity Deviation (LAVD), and both FTLE saddle and λ-saddle are all applied around the LEV to identify the vortex dynamics. This is compared with a calculation of the circulation and the vortex shedding mechanism (VSM). The identified LEV dynamics revealed by multiple vortex criteria match with the circulation development and lift history in time, suggesting that LEV separation is a good model for various vortex shedding mechanisms.

AB - The separation process of leading edge vortices (LEV) from an unsteady pitching plate is studied. The analysis processes a large amount of data from the two dimensional (2D) simulation of a at plate undergoing a 45° pitch-up maneuver. Large scale lift loss on the plate is shown to correlate with the vortex shedding. A Lagrangian coherent structures (LCS) analysis, including hyperbolic LCSs, Lagrangian-Averaged Vorticity Deviation (LAVD), and both FTLE saddle and λ-saddle are all applied around the LEV to identify the vortex dynamics. This is compared with a calculation of the circulation and the vortex shedding mechanism (VSM). The identified LEV dynamics revealed by multiple vortex criteria match with the circulation development and lift history in time, suggesting that LEV separation is a good model for various vortex shedding mechanisms.

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BT - 8th AIAA Theoretical Fluid Mechanics Conference, 2017

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T2 - 8th AIAA Theoretical Fluid Mechanics Conference, 2017

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