Numerical simulations were conducted in order to investigate the three-dimensional flow-field behind a normal flat plate undergoing two dimensional symmetric flapping motion resulting in hover. The aspect ratio of the plate considered in this work is 3. A flapping trajectory undergoing translation and rotation resulting in Reynolds number of 225 was investigated. The focus of this work is to understand the formation of wake vortices and physical mechanisms present in the transport of vorticity. For the wing trajectory considered in this work, the formation number for the leading-edge vortex was found to be 3.8. Vorticity transport equation was analyzed. Results underline the importance of wing kinematics and show the highly three-dimensional effects present at the tip.
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