蝶の離陸の自由飛翔シミュレーション(生物の流れ(1),一般講演)

概要

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6 degrees of freedom (DOF) flight simulation of a butterfly taking off the ground has been carried out. We have focused on three major points of the butterfly takeoff: high wing-body mass ratio which results in large amplitude oscillation, variable wing geometry in each wingbeat cycle which results in altered aerodynamic characteristics, and the flier's proximity to the ground. We have coupled fluid dynamics and rigid-body dynamics solvers so that free-flight simulation is achieved. We have adopted simple models for geometry variation, in which each the change in wing area and the change in camber is prescribed as a function of time. We have introduced a Cartesian background grid system, where by applying no-slip condition to the lower surface, virtual "ground" can be founded. In addition, leg thrust is modelled as initial velocity. The computed trajectory is in a reasonable agreement with the experimental result.
日本流体力学会の論文
2010-09-09