Abstract
Unsteady, viscous e ows over e apping airfoils in a biplane cone guration are computed on moving overset grids. The overset grid solutions are obtained in parallel in a distributed memory environment. Unsteady e owe elds are described by particle traces. Time-averaged thrust values are obtained from the integration of the unsteady drag coefe cient. It isshown thatairfoilsin abiplanecone guration andoscillatingina combinedpitchand plungemotion with a proper phase shift between them produce 20 ‐40% more thrust than a single e apping airfoil. Turbulence in the e ow further augments the thrust generation. For a maximum thrust at a given e apping frequency, an optimization of the e apping motion parameters is needed.
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