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- W2269571806 abstract "We study the relative translation of two arbitrarily shaped objects, caused by their hydrodynamic interaction as they are forced through a viscous fluid in the limit of zero Reynolds number. It is well known that in the case of two rigid spheres in an unbounded fluid, the hydrodynamic interaction does not produce relative translation. More generally, such an effective pair-interaction vanishes in configurations with spatial inversion symmetry; for example, an enantiomorphic pair in mirror image positions has no relative translation. We show that the breaking of inversion symmetry by boundaries of the system accounts for the interactions between two spheres in confined geometries, as observed in experiments. The same general principle also provides new predictions for interactions in other object configurations near obstacles. We examine the time-dependent relative translation of two self-aligning objects, extending the numerical analysis of our preceding publication [Goldfriend, Diamant, and Witten, Phys. Fluids 27, 123303 (2015)]. The interplay between the orientational interaction and the translational one, in most cases, leads over time to repulsion between the two objects. The repulsion is qualitatively different for self-aligning objects compared to the more symmetric case of uniform prolate spheroids. The separation between the two objects increases with time $t$ as ${t}^{1/3}$ in the former case, and more strongly, as $t$, in the latter." @default.
- W2269571806 created "2016-06-24" @default.
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- W2269571806 date "2016-04-20" @default.
- W2269571806 modified "2023-10-17" @default.
- W2269571806 title "Hydrodynamic interactions between two forced objects of arbitrary shape. II. Relative translation" @default.
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- W2269571806 doi "https://doi.org/10.1103/physreve.93.042609" @default.
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