Transitions in swimming behavior at intermediate Reynolds numbers of a reciprocal two-sphere swimmer

ORAL

Abstract

We used the immersed boundary method to investigate an internally-powered reciprocal swimmer composed of two unequal sized spheres that oscillate with respect to each other. We investigated its swimming behavior over a range of Reynolds numbers ranging from Stokes flow (Re=0) to intermediate Reynolds numbers (Re=150). Because the swimmer has a reciprocal stroke, it does not swim in the Stokes regime but it will swim at intermediate Reynolds numbers. We were surprised to find that the direction of swimming depends on the Reynolds number. We identified two motility regimes: one where the swimmer moves in the direction of the large sphere and one where the swimmer moves in the direction of the small sphere. We also found that the average flow around the swimmer is different in the two regimes and qualitatively similar to pushers and pullers.

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Presenters

  • Shannon Jones

    • Applied Physical Sciences, The University of North Carolina at Chapel Hill
    • Applied Physical Sciences, University of North Carolina at Chapel Hill

Authors

  • Shannon Jones

    • Applied Physical Sciences, The University of North Carolina at Chapel Hill
    • Applied Physical Sciences, University of North Carolina at Chapel Hill

  • Amneet Bhalla

    • Applied Numerical Algorithms Group, Lawrence Berkeley National Laboratory

  • Georgios Katsikis

    • Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology

  • Boyce Griffith

    • Mathematics, The University of North Carolina at Chapel Hill
    • Department of Mathematics, University of North Carolina at Chapel Hill

  • Daphne Klotsa

    • Applied Physical Sciences, The University of North Carolina at Chapel Hill
    • UNC - Chapel Hill
    • Applied Physical Sciences, University of North Carolina at Chapel Hill
    • Univ of NC - Chapel Hill