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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
ASSESSMENT OF THE WAKE PATTERNS AND UNSTEADY LOADS FOR A NACA0012 AIRFOIL UNDER HEAVING AND PITCHING MOTION
Submission Author:
Lucas Frederico , SP
Co-Authors:
William Wolf, Lucas Frederico
Presenter: Lucas Frederico
doi://10.26678/ABCM.COBEM2017.COB17-1002
Abstract
The present study presents numerical simulations of a NACA0012 airfoil under heaving and pitching motion. We employ a computational fluid dynamics tool which features low dispersion and dissipation characteristics. The current simulations are able to resolve unsteady flow features which may occur in the flight of insects, maneuvering aircraft and other biological and engineering systems. For example, it is possible to analyze the aerodynamic time-response of an airfoil subjected to external perturbations or forced movements such as a rapid increase in the airfoil angle of attack. The current study also provides a brief investigation of the Knoller-Betz effect for thrust and its correlation to flapping flight dynamics. Aspects of airfoils under heaving and pitching movements are studied analyzing the momentum variations and the flow patterns along the vortex wake. Moreover, in the post-processing phase, a wavelet analysis is applied in order to examine the spectral characteristics of the flow features which may be impulsive/non-periodical.
Keywords
Oscillating airfoils, dynamic stall, wavelets
