The term “bioconvection” describes hydrodynamic instabilities and patterns in suspensions
of biased swimming microorganisms. Hydrodynamic instabilities arise from coupling …

The swimming trajectories of self-propelled organisms or synthetic devices in a viscous fluid
can be altered by hydrodynamic interactions with nearby boundaries. We explore a …

The persistent motility of individual constituents in microbial suspensions represents a prime
example of the so-called active matter systems. Cells consume energy, exert forces and …

The natural habitats of planktonic and swimming microorganisms, from algae in the oceans
to bacteria living in soil or intestines, are characterized by highly heterogeneous fluid flows …

We study a suspension of active dumbbells of variable density, as a minimal example of an
active polar fluid. As in a fluid of spherical swimmers, we find that motility triggers a …

The transport of self-propelled particles such as bacteria and phoretic swimmers through
crowded heterogeneous environments is relevant to many natural and engineering …

Locomotion of self-propelled particles such as motile bacteria or phoretic swimmers often
takes place in the presence of applied flows and confining boundaries. Interactions of these …

Transport of micro-organisms in confined flows can be characterized by a one-dimensional
overall dispersion mechanism, of importance to various biotechnological applications …

When motile algal cells are exposed to gyrotactic torques, their swimming directions are
guided to form radial accumulation, well known as hydrodynamic focusing. The origin of …

Shear flow significantly affects the transport of swimming algae in suspension. For example,
viscous and gravitational torques bias bottom-heavy cells to swim towards regions of …