扇贝定理与中尺度游泳
The Scallop Theorem and Swimming at the Mesoscale
摘要：
通过协同建模，仿真和实验相结合，我们表明，存在一个政权的自推进中的流体动力学的惯性可以从游泳者分离。这是证明了一个不对称的哑铃，尽管在一个相互的方式变形，自我传播的流体中，由于非互易斯托克斯流场的运动。后者是由两种构成珠粒的滑行时间的差异引起的。这种不对称性作为第二个自由度，恢复扇贝定理在介观尺度。
英文摘要：
By synergistically combining modeling, simulation and experiments, we show that there exists a regime of self-propulsion in which the inertia in the fluid dynamics can be separated from that of the swimmer. This is demonstrated by the motion of an asymmetric dumbbell that, despite deforming in a reciprocal fashion, self-propagates in a fluid due to a non-reciprocal Stokesian flow field. The latter arises from the difference in the coasting times of the two constitutive beads. This asymmetry acts as a second degree of freedom, recovering the scallop theorem at the mesoscopic scale.
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