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We investigate the hydrodynamic interaction between two elastic swimmerswhich are composed of three spheres and two harmonic springs. In this model,the natural length of each spring is assumed to undergo a prescribed cyclicchange, representing internal states of the swimmer [K. Yasuda et al., J. Phys.Soc. Jpn. 86, 093801 (2017)]. We obtain the average velocities of two identicalelastic swimmers as a function of the distance between them both forstructurally asymmetric and symmetric swimmers. We show that the mean velocityof the two swimmers is always smaller than that of a single elastic swimmer.The swimming state of two swimmers can be either bound or unbound depending onthe relative phase difference between the two elastic swimmers.

Hydrodynamic interaction between two elastic microswimmers