Swimming near Deformable Membranes at Low Reynolds Number

Abstract

Microorganisms are rarely found in Nature swimming freely in an unbounded fluid. Instead, they typically encounter other organisms, hard walls, or deformable boundaries such as free interfaces or membranes. Hydrodynamic interactions between the swimmer and nearby objects lead to many interesting phenomena, such as changes in swimming speed, tendencies to accumulate or turn, and coordinated flagellar beating. Inspired by this class of problems, we investigate locomotion of microorganisms near deformable boundaries. We calculate the speed of an infinitely long swimmer close to a flexible surface separating two fluids; we also calculate the deformation and swimming speed of the flexible surface. When the viscosities on either side of the flexible interface differ, we find that fluid is pumped along or against the swimming direction, depending on which viscosity is greater.

References in corpus (6)

• The hydrodynamics of swimming microorganisms
• Fluid dynamics and noise in bacterial cell-cell and cell-surface scattering
• Soft swimming: Exploiting deformable interfaces for low-Reynolds number locomotion
• Enhanced motility of a microswimmer in rigid and elastic confinement
• Crawling beneath the free surface: Water snail locomotion
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Cited by in corpus (5)

• Leveraging Collective Effects in Externally Driven Colloidal Suspensions: Experiments and Simulations
• Swimming in Complex Fluids
• The hydrodynamics of slender swimmers near deformable interfaces
• Low Reynolds number pumping near an elastic half space
• Enhancement and Suppression of Active Particle Movement Due to Membrane Deformations