Hydrodynamics of active particles in viscosity gradients

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Abstract

The introduction of a particle into a preexisting nonuniform viscosity field will generally modify the viscosity field in order to satisfy boundary conditions on the particle surface. Here we discuss the effect of this disturbance viscosity on the dynamics of active particles, as well as characterize the relative importance of the local changes in stress versus the nonlocal flow changes due to nonuniform viscosity.