Unsteady and inertial dynamics of a small active particle in a fluid

It is well known that the reversibility of Stokes flow makes it difficult for small microorganisms to swim. Inertial effects break this reversibility, allowing new mechanisms propulsion and feeding. Therefore important understand unsteady fluid inertia on dynamics in flow. In work, we show how translate inertial non-motile organisms motile ones, from passive active particles. The method relies a principle used earlier by Legendre Magnaudet (1997) deduce corrections lift force bubble drag solid sphere, using fact are determined far field disturbance allows example compute effect accelerations organisms, forces such experience steady shear We explain why fails describe convective inertia.