Geometry-dependent viscosity reduction in sheared active fluids
Author(s)Slomka, Jonasz Jozef; Dunkel, Joern
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We investigate flow pattern formation and viscosity reduction mechanisms in active fluids by studying a generalized Navier-Stokes model that captures the experimentally observed bulk vortex dynamics in microbial suspensions. We present exact analytical solutions including stress-free vortex lattices and introduce a computational framework that allows the efficient treatment of higher-order shear boundary conditions. Large-scale parameter scans identify the conditions for spontaneous flow symmetry breaking, geometry-dependent viscosity reduction, and negative-viscosity states amenable to energy harvesting in confined suspensions. The theory uses only generic assumptions about the symmetries and long -wavelength structure of active stress tensors, suggesting that inviscid phases may be achievable in a broad class of nonequilibrium fluids by tuning confinement geometry and pattern scale selection.
DepartmentMassachusetts Institute of Technology. Department of Mathematics
Physical Review Fluids
American Physical Society (APS)
Słomka, Jonasz, and Jörn Dunkel. “Geometry-Dependent Viscosity Reduction in Sheared Active Fluids.” Physical Review Fluids, vol. 2, no. 4, Apr. 2017. © 2017 American Physical Society.
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