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http://dx.doi.org/10.5407/JKSV.2017.14.2.033

Fluttering Characteristics of Free-falling Plates  

Hong, Seulki (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)
Chae, Seokbong (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)
Kim, Jooha (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)
Publication Information
Journal of the Korean Society of Visualization / v.15, no.2, 2017 , pp. 33-40 More about this Journal
Abstract
Abstract In the present study, the characteristics of kinematics and dynamics in the fluttering motion of free-falling plates are investigated at Reynolds number of $10^5$. We record quasi-two-dimensional trajectories of free-falling plates with and without superhydrophobic coating using high-speed camera, and compute the drag and lift forces by trajectory analysis. Translational and angular velocities are modeled as harmonic functions with specific phase differences. In particular, periodic mass elevations near turning points are explained using the suggested models. At each turning point, a sudden drop in lift and a rapid increase in drag occur simultaneously due to fast increase in angle of attack. However, the lift is increased over the buoyancy-corrected weight of plate during gliding flight, resulting in periodic mass elevations near turning points. Superhydrophobicity is shown to increase lift but to reduce drag on a fluttering plate, resulting in the decrease of mean descent speed.
Keywords
Free-falling plate; Fluttering; Lift; Drag;
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