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      Generic long-range interactions between passive bodies in an active fluid

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          Abstract

          A single non-spherical body placed in an active fluid generates currents. We show that when two or more passive bodies are placed in an active fluid these currents lead to long-range interactions. Using a multipole expansion we characterize their leading-order behaviors in terms of single-body properties and show that they decay as a power law with the distance between the bodies, are anisotropic, and do not obey an action-reaction principle. The interactions lead to rich dynamics of the bodies, illustrated by the spontaneous synchronized rotation of pinned non-chiral bodies and the formation of traveling bound pairs. The occurrence of these phenomena depends on tunable properties of the bodies, thus opening new possibilities for self-assembly mediated by active fluids.

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          Author and article information

          Journal
          07 September 2017
          Article
          1709.02281
          0fb90860-e1e1-4e79-8cd1-f4ded8280696

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          20 pages, 6 figures
          cond-mat.stat-mech

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