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雷达卡
摘要翻译：
讨论了一个微观游泳者在线性剪切流中迁移的最优策略。两种情况，其中游泳者位于大距离和在固体墙附近，被考虑在内。结果表明，在不需要内部能量源或外部驱动的情况下，通过逆流航行和游动相结合的方式可以实现游动，游动是由外部水流诱导的。讨论了游泳者向所需方向运动所需的结构动力学，分析了两种简单的模型，分别基于弹性结构的存在和方位相关摩擦力来控制外流引起的变形。在所有情况下，变形序列都是剪切流中囊泡中观察到的坦克踩踏运动状态的概括。给出了偏移速度随变形模式和振幅变化的解析表达式。讨论了热涨落对推进力的影响，并讨论了利用噪声克服扇贝定理对微游泳器的限制的可能性。
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英文标题：
《Effective swimming strategies in low Reynolds number flows》
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作者：
Piero Olla
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最新提交年份：
2011
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分类信息：
一级分类：Physics 物理学
二级分类：Soft Condensed Matter 软凝聚态物质
分类描述：Membranes, polymers, liquid crystals, glasses, colloids, granular matter
膜，聚合物，液晶，玻璃，胶体，颗粒物质
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一级分类：Physics 物理学
二级分类：Fluid Dynamics 流体动力学
分类描述：Turbulence, instabilities, incompressible/compressible flows, reacting flows. Aero/hydrodynamics, fluid-structure interactions, acoustics. Biological fluid dynamics, micro/nanofluidics, interfacial phenomena. Complex fluids, suspensions and granular flows, porous media flows. Geophysical flows, thermoconvective and stratified flows. Mathematical and computational methods for fluid dynamics, fluid flow models, experimental techniques.
湍流，不稳定性，不可压缩/可压缩流，反应流。气动/流体力学，流体-结构相互作用，声学。生物流体力学，微/纳米流体力学，界面现象。复杂流体，悬浮液和颗粒流，多孔介质流。地球物理流，热对流和层流。流体动力学的数学和计算方法，流体流动模型，实验技术。
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一级分类：Quantitative Biology 数量生物学
二级分类：Other Quantitative Biology 其他定量生物学
分类描述：Work in quantitative biology that does not fit into the other q-bio classifications
不适合其他q-bio分类的定量生物学工作
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英文摘要：
The optimal strategy for a microscopic swimmer to migrate across a linear shear flow is discussed. The two cases, in which the swimmer is located at large distance, and in the proximity of a solid wall, are taken into account. It is shown that migration can be achieved by means of a combination of sailing through the flow and swimming, where the swimming strokes are induced by the external flow without need of internal energy sources or external drives. The structural dynamics required for the swimmer to move in the desired direction is discussed and two simple models, based respectively on the presence of an elastic structure, and on an orientation dependent friction, to control the deformations induced by the external flow, are analyzed. In all cases, the deformation sequence is a generalization of the tank-treading motion regimes observed in vesicles in shear flows. Analytic expressions for the migration velocity as a function of the deformation pattern and amplitude are provided. The effects of thermal fluctuations on propulsion have been discussed and the possibility that noise be exploited to overcome the limitations imposed on the microswimmer by the scallop theorem have been discussed.
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PDF链接：
https://arxiv.org/pdf/1004.4179
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