A Pitching Foil with a Flexible flap Creates an Orderly Jet

Details A Pitching Foil with a Flexible flap Creates an Orderly Jet A Pitching Foil with a Flexible flap Creates an Orderly Jet

2010-10-18

arxiv.org/abs/1010.3577v1

Physics

Fluid Dynamics

Two videos are uploaded: 1) "FLEXIBLE_FOIL_JET" in MPEG1 format 2) "FLEXIBLE_FOIL_JET_long" in MPEG4 format for APS-DFD confer

Scientific paper

We experimentally studied the effect of flexibility on the flow produced by sinusoidally pitching foil in quiescent fluid. The rigid foil produces a weak, divergent and meandering jet. On the contrary, the foil with a flexible flap produces an orderly, narrow, coherent jet. It has been observed that such orderly jet is produced when the flap has appropriate flexibility. The jet produced in quiescent fluid by the flexible foil is accompanied by a corresponding thrust. In that sense, this is simple and different type of hovering.

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