Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F16: Aerodynamics: Unsteady Effects II
8:00 AM–9:57 AM,
Monday, November 19, 2018
Georgia World Congress Center Room: B303
Chair: Karen Mulleners, École Polytechnique Fédérale de Lausanne
Abstract ID: BAPS.2018.DFD.F16.7
Abstract: F16.00007 : Self-propulsion of an airfoil in combined heave-pitch motion*
9:18 AM–9:31 AM
Jay D Young
(Cornell University, Cornell University)
In this work, we study the dynamics of flapping airfoils under the combined motion of heave and pitch. We impose such motions using our CPFD (Cyber-Physical Fluid Dynamics) facility, a closed-loop force-feedback control system. Steady state self-propulsion is achieved when the generated thrust becomes equal to the drag of the system. As we vary the airfoil motion in a heave-pitch diagram, we produce a set of contours of various parameters, for example a set of normalized velocity contours. Along each contour, the self-propelled velocity is a constant, and we can find where the propulsive economy (a measure of efficiency) is maximized. In the heave-pitch plane, we can define a curve of maximum propulsive economy. Measurements of vorticity are made using PIV, and enable us to observe the vortex dynamics corresponding with the optimal conditions. By implementing this "virtual-physical" approach, we are able to complete around 400 equivalent purely-physical experiments. This capability is key in enabling us to define, with sufficient resolution, the contour plots within the heave-pitch diagrams.
*This work is supported by the AFOSR Grant No. FA9550-15-1-0243, monitored by Dr. Douglas Smith.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F16.7
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