The curved kinetic boundary layer of active matter

Abstract

The finite reorient-time of swimmers leads to a finite run length $\ell$ and the kinetic accumulation boundary layer on the microscopic length scale $\delta$ on a non-penetrating wall. That boundary layer is the microscopic origin of the swim pressure, and is impacted by the geometry of the boundary [Yan \& Brady, \textit{J. Fluid. Mech.}, 2015, \textbf{785}, R1]. In this work we extend the analysis to analytically solve the boundary layer on an arbitrary-shaped body distorted by the local mean curvature. The solution gives the swim pressure distribution and the total force (torque) on an arbitrarily shaped body immersed in swimmers, with a general scaling of the curvature effect ${\Pi }^{swim}\sim \lambda {\delta }^2/L$.

References in corpus (2)

• Hydrodynamic attraction of swimming microorganisms by surfaces
• Transport powered by bacterial turbulence

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• Forced microrheology of active colloids
• Macrotransport of active particles in periodic channels and fields: rectification and dispersion