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de Graaf J, Mathijssen AJ, Fabritius M, et al. Understanding the onset of oscillatory swimming in microchannels. Soft Matter. 2016;12(21):4704-8doi: 10.1039/c6sm00939e.
de Graaf, J., Mathijssen, A. J., Fabritius, M., Menke, H., Holm, C., & Shendruk, T. N. (2016). Understanding the onset of oscillatory swimming in microchannels. Soft matter, 12(21), 4704-8. https://doi.org/10.1039/c6sm00939e
de Graaf, Joost, et al. "Understanding the onset of oscillatory swimming in microchannels." Soft matter vol. 12,21 (2016): 4704-8. doi: https://doi.org/10.1039/c6sm00939e
de Graaf J, Mathijssen AJ, Fabritius M, Menke H, Holm C, Shendruk TN. Understanding the onset of oscillatory swimming in microchannels. Soft Matter. 2016 May 25;12(21):4704-8. doi: 10.1039/c6sm00939e. PMID: 27184912.
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Soft Matter. 2016 May 25;12(21):4704-8. doi: 10.1039/c6sm00939e.

Understanding the onset of oscillatory swimming in microchannels.

Soft matter

Joost de Graaf, Arnold J T M Mathijssen, Marc Fabritius, Henri Menke, Christian Holm, Tyler N Shendruk

Affiliations

  1. Institute for Computational Physics, University of Stuttgart, Allmandring 3, 70569 Stuttgart, Germany. [email protected].
  2. The Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford, OX1 3NP, UK.

PMID: 27184912 DOI: 10.1039/c6sm00939e

Abstract

Self-propelled colloids (swimmers) in confining geometries follow trajectories determined by hydrodynamic interactions with the bounding surfaces. However, typically these interactions are ignored or truncated to the lowest order. We demonstrate that higher-order hydrodynamic moments cause rod-like swimmers to follow oscillatory trajectories in quiescent fluid between two parallel plates, using a combination of lattice-Boltzmann simulations and far-field calculations. This behavior occurs even far from the confining walls and does not require lubrication results. We show that a swimmer's hydrodynamic quadrupole moment is crucial to the onset of the oscillatory trajectories. This insight allows us to develop a simple model for the dynamics near the channel center based on these higher hydrodynamic moments, and suggests opportunities for trajectory-based experimental characterization of swimmers' hydrodynamic properties.

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