TY - GEN
T1 - Leading edge vortex separation study by different vortex and flow separation identification methods
AU - Huang, Yangzi
AU - Green, Melissa A.
N1 - Funding Information:
Dr. Jeff Eldredge and his research group at UCLA are gratefully acknowledged for sharing the database of simulation results for the current research. This work was supported by the Air Force Office of Scientific Research under AFOSR Award No. FA9550-14-1-0210.
Publisher Copyright:
© 2017, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2017
Y1 - 2017
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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M3 - Conference contribution
AN - SCOPUS:85023634856
SN - 9781624104978
T3 - 8th AIAA Theoretical Fluid Mechanics Conference, 2017
BT - 8th AIAA Theoretical Fluid Mechanics Conference, 2017
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - 8th AIAA Theoretical Fluid Mechanics Conference, 2017
Y2 - 5 June 2017 through 9 June 2017
ER -