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Dynamics and Energy Extraction of a Surging and Plunging Airfoil at Low Reynolds Number

Choi, Jeesoon and Colonius, Tim and Williams, David (2013) Dynamics and Energy Extraction of a Surging and Plunging Airfoil at Low Reynolds Number. In: 51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition, 7-10 January 2013, Grapevine, TX.

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We investigate the unsteady aerodynamic forces and energy transfer associated with harmonic surging (streamwise) and plunging (transverse) motion of a thin airfoil at low Reynolds number. Two-dimensional unsteady flows are simulated over a large range of amplitude and reduced-frequency of the oscillatory motion using the immersed boundary projection method, and the computational results are compared to inviscid flow models and experiments. At low angle of attack there is reasonable agreement with inviscid theory for the amplitude and phase of lift fluctuations, despite the low Reynolds number. At high angle of attack, the separated flow leads to larger lift and drag fluctuations not captured by inviscid models. At frequencies below the vortex shedding frequency, lift fluctuations are first enhanced and then attenuated depending on the phase between the freestream velocity and the forming leading-edge vortex. Resonance with the vortex shedding frequency also occurs. The time-averaged forces and power supplied by the oscillating airfoil are also evaluated to find frequency ranges that are favorable for the airfoil.

Item Type:Conference or Workshop Item (Paper)
Related URLs:
URLURL TypeDescription Paper Paper
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2013 American Institute of Aeronautics and Astronautics. Published Online: 5 Jan 2013. This work was supported by the Air Force Office of Scientific Research (FA950-09-1-0189).
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA950-09-1-0189
Subject Keywords:Aerospace Systems, Operations and Life Cycle
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Other Numbering System NameOther Numbering System ID
AIAA Paper2013-0672
Record Number:CaltechAUTHORS:20190712-112321331
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97107
Deposited By: Melissa Ray
Deposited On:15 Jul 2019 17:57
Last Modified:16 Nov 2021 17:26

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