Unsteady aerodynamic forces on small-scale wings: Experiments, simulations and models

Steven L. Brunton, Clarence Worth Rowley, Kunihiko Taira, Tim Colonius, Jesse Collins, David R. Williams

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Scopus citations

Abstract

The goal of this work is to develop low order dynamical systems models for the unsteady lift and drag forces on small wings in various modes of flight, and to better understand the physical characteristics of unsteady laminar separation. Velocity field and body force data for a flat plate at static angle of attack and in sinusoidal pitch and plunge maneuvers are generated by 2D direct numerical simulations using an immersed boundary method at Re = 100. The lift of a sinusoidally plunging plate is found to deviate from the quasi-steady approximation at a reduced frequency of κ = 0.5 over a range of Strouhal numbers. Lagrangian coherent structures illustrate formation and convection of a leading-edge vortex in sinusoidal pitch and plunge. A phenomenological ODE model with three states is shown to reproduce the lift on a flat plate at a static angle of attack above the stall angle. DNS for a 3D pitch-up maneuver of a rectangular plate at Re = 300 shows the effect of aspect ratio on vortical wake structure and lift. Wind tunnel experiments of a wing in single pitch-up and sinusoidal pitch maneuvers are compared with a dynamic model incorporating time delays and relaxation times to produce hysteresis.

Original languageEnglish (US)
Title of host publication46th AIAA Aerospace Sciences Meeting and Exhibit
StatePublished - Dec 1 2008
Event46th AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: Jan 7 2008Jan 10 2008

Publication series

Name46th AIAA Aerospace Sciences Meeting and Exhibit

Other

Other46th AIAA Aerospace Sciences Meeting and Exhibit
CountryUnited States
CityReno, NV
Period1/7/081/10/08

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

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    Brunton, S. L., Rowley, C. W., Taira, K., Colonius, T., Collins, J., & Williams, D. R. (2008). Unsteady aerodynamic forces on small-scale wings: Experiments, simulations and models. In 46th AIAA Aerospace Sciences Meeting and Exhibit [2008-0520] (46th AIAA Aerospace Sciences Meeting and Exhibit).