Active fluids exhibit spontaneous flows with complex spatiotemporal structure, which have
been observed in bacterial suspensions, sperm cells, cytoskeletal suspensions, self …

We review the literature on swimming in complex fluids. A classification is proposed by
comparing the length-and timescales of a swimmer with those of nearby obstacles …

Microswimmers exhibit an intriguing, highly-dynamic collective motion with large-scale
swirling and streaming patterns, denoted as active turbulence–reminiscent of classical high …

Active fluids exhibit complex turbulentlike flows at low Reynolds number. Recent work
predicted that 2D active nematic turbulence follows scaling laws with universal exponents …

We experimentally study the emergence of collective bacterial swimming, a phenomenon
often referred to as bacterial turbulence. A phase diagram of the flow of 3D Escherichia coli …

Giant number fluctuations are often considered as a hallmark of the emergent
nonequilibrium dynamics of active fluids. However, these anomalous density fluctuations …

Active matter exhibits various forms of nonequilibrium states in the absence of external
forcing, including macroscopic steady-state currents. Such states are often too complex to be …

We report numerical results for the hydrodynamics of inhomogeneous lyotropic and
extensile active nematic gels. By simulating the coupled Cahn–Hilliard, Navier–Stokes, and …

Self-propelled particles such as bacteria or algae swimming through a fluid are non-
equilibrium systems where particle motility breaks microscopic detailed balance, often …

Suspensions of rear-and front-actuated microswimmers immersed in a fluid, known
respectively as “pushers” and “pullers,” display qualitatively different collective behaviors …