Corpus ID: 237490450

Squirmer hydrodynamics near a periodic surface topography

  title={Squirmer hydrodynamics near a periodic surface topography},
  author={Kenta Ishimoto and Eamonn A. Gaffney and David J. Smith},
The behaviour of microscopic swimmers has previously been explored near large scale confining geometries and in the presence of very small-scale surface roughness. Here we consider an intermediate case of how a simple microswimmer, the tangential spherical squirmer, behaves adjacent to singlyand doubly-periodic sinusoidal surface topographies that spatially oscillate with an amplitude that is an order of magnitude less than the swimmer size and wavelengths within an order of magnitude of this… Expand

Figures and Tables from this paper


Squirmer dynamics near a boundary.
  • K. Ishimoto, E. Gaffney
  • Mathematics, Medicine
  • Physical review. E, Statistical, nonlinear, and soft matter physics
  • 2013
The boundary behavior of axisymmetric microswimming squirmers is theoretically explored within an inertialess Newtonian fluid for a no-slip interface and also a free surface in the small capillaryExpand
Colloidal swimmers near curved and structured walls.
The results show explicitly how introducing curvature to the wall not only affects the average incident angle the swimmer acquires when swimming near it, but it also leads to much broader angular distributions, which suggests an increasingly leading role of thermal fluctuations with curvature, which in turn results in significantly different motility of the swimmers. Expand
Motion of a model swimmer near a weakly deforming interface
Locomotion of microswimmers near an interface has attracted recent attention and has several applications related to synthetic swimmers and microorganisms. In this work, we study the motion of aExpand
Hydrodynamic oscillations and variable swimming speed in squirmers close to repulsive walls.
This work presents a lattice Boltzmann study of the hydrodynamics of a fully resolved squirmer, confined in a slab of fluid between two no-slip walls, and shows that a pusher moves significantly faster when close to a surface than in the bulk. Expand
Geometric capture and escape of a microswimmer colliding with an obstacle.
This work addresses the hydrodynamic capture of a microswimmer near a stationary spherical obstacle analytically and shows that in some cases the trapping time is governed by an Ornstein-Uhlenbeck process, which results in a trapping time distribution that is well-approximated as inverse-Gaussian. Expand
Guidance of microswimmers by wall and flow: Thigmotaxis and rheotaxis of unsteady squirmers in two and three dimensions.
Two-dimensional approximation could be useful in designing microfluidic devices for the guidance of microswimmers and for clarifying the locomotions in a complex geometry. Expand
Hydrodynamic interaction of two swimming model micro-organisms
In order to understand the rheological and transport properties of a suspension of swimming micro-organisms, it is necessary to analyse the fluid-dynamical interaction of pairs of such swimmingExpand
Hydrodynamic capture of microswimmers into sphere-bound orbits.
This study reveals the crucial aspects of activity–driven interactions of self-propelled particles with passive objects, and brings into question the use of colloidal tracers as probes of active matter. Expand
Rheotaxis of spherical active particles near a planar wall.
It is shown that, for a broad class of spherical active particles, rheotactic behavior may emerge via a mechanism which involves "self-trapping" near a hard wall owing to the active propulsion of the particles, combined with their rotation, alignment, and "locking" of the direction of motion into the shear plane. Expand
A study of spermatozoan swimming stability near a surface.
The predicted sensitivity of the accumulation height of swimming sperm to the beat pattern wavenumber is sufficient to suggest the possibility that the limited focal depth of typical microscopy studies analysing flagellar patterns with a fixed focal plane may inadvertently bias the wavenumbers of the sperm that are observed. Expand