動く球や円柱が引き起こす流体粒子の軌道(解析・予測・制御流体数理(3),一般講演)

概要

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The movement of particles around a running cylinder or a sphere is considered. Particle trajectories viewed from a fixed object are contours of the stream-function and well-known in many cases. Here we are concerned with trajectories viewed from the absolute coordinates where the object is moving. In 1870, J.C. Maxwell considered the problem in irrotational flow of inviscid fluid, and found that the trajectory of a particle is a curve of elastica. We consider here a similar problem in 3D irrotational flow, 3D Stokes flow around a sphere, and Brinkman's porous-media flow. In the last case, our numerical examinations reveal some new interesting features of the particle trajectories, which are not observed in the case of irrotational flow.
日本流体力学会の論文
2009-09-02