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Main Title: Taylor line swimming in microchannels and cubic lattices of obstacles
Author(s): Münch, Jan L.
Alizadehrad, Davod
Babu, Sujin B.
Stark, Holger
Type: Article
Language Code: en
Abstract: 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.
Issue Date: 2016
Date Available: 24-Oct-2017
DDC Class: 530 Physik
Sponsor/Funder: DFG, GRK 1558, Kollektive Dynamik im Nichtgleichgewicht: in kondensierter Materie und biologischen Systemen
DFG, SPP 1726, Mikroschwimmer - Von Einzelpartikelbewegung zu kollektivem Verhalten
Journal Title: Soft matter
Publisher: Royal Society of Chemistry
Publisher Place: Cambridge
Volume: 12
Issue: 35
Publisher DOI: 10.1039/c6sm01304j
Page Start: 7350
Page End: 7363
EISSN: 1744-6848
ISSN: 1744-683X
Appears in Collections:FG Statistische Physik weicher Materie und biologischer Systeme » Publications

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