Issue 35, 2016

Taylor line swimming in microchannels and cubic lattices of obstacles


Microorganisms naturally move in microstructured fluids. Using the simulation method of multi-particle collision dynamics, we study in two dimensions an undulatory Taylor line swimming in a microchannel and in a cubic lattice of obstacles, which represent simple forms of a microstructured environment. In the microchannel the Taylor line swims at an acute angle along a channel wall with a clearly enhanced swimming speed due to hydrodynamic interactions with the bounding wall. While in a dilute obstacle lattice swimming speed is also enhanced, a dense obstacle lattice gives rise to geometric swimming. This new type of swimming is characterized by a drastically increased swimming speed. Since the Taylor line has to fit into the free space of the obstacle lattice, the swimming speed is close to the phase velocity of the bending wave traveling along the Taylor line. While adjusting its swimming motion within the lattice, the Taylor line chooses a specific swimming direction, which we classify by a lattice vector. When plotting the swimming velocity versus the magnitude of the lattice vector, all our data collapse on a single master curve. Finally, we also report more complex trajectories within the obstacle lattice.

Graphical abstract: Taylor line swimming in microchannels and cubic lattices of obstacles

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Article information

Article type
07 Jun 2016
15 Jul 2016
First published
15 Jul 2016
This article is Open Access
Creative Commons BY license

Soft Matter, 2016,12, 7350-7363

Taylor line swimming in microchannels and cubic lattices of obstacles

J. L. Münch, D. Alizadehrad, S. B. Babu and H. Stark, Soft Matter, 2016, 12, 7350 DOI: 10.1039/C6SM01304J

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