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DY: Fachverband Dynamik und Statistische Physik

DY 27: Microfluidics

DY 27.5: Vortrag

Dienstag, 13. März 2018, 12:15–12:30, BH-N 128

Inertial elevation of deformable particles in a shaken fluid — •Matthias Laumann¹, Andre Förtsch¹, Eva Kanso², and Walter Zimmermann¹ — ¹Theoretische Physik I, Physikalisches Institut, Universität Bayreuth, 95440 Bayreuth, Germany — ²Aerospace and Mechanical Eng., University of Southern California, Los Angeles, California 90089, USA

Biological and bioinspired swimmers can move by shape actuation. Great progress has been made in understanding the direct control of shape variables for locomotory purposes. However, actuation via a time-dependent fluid motion is less well explored. Here, we examine the nonlinear coupling between shape variables and locomotion in a model system in oscillating flow including body inertia. As model we use a bead-spring tetrahedron. We determine effective conditions that lead to a non vanishing velocity in the oscillating external flow. Furthermore we give a simple explanation of the effect. These results suggest that one can tune the background flow properties to control the swimmer motion, and thus, they may have profound implications on design and employment of man-made swimmers in oscillatory flows.