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Department of Mathematical Sciences

Seminar Archives

On this page you can find information about seminars in this and previous academic years, where available on the database.


Presented by Prof. Julia Yeomans, Oxford University

13 March 2012 14:00 in Department of Mathematical Sciences

Because of their size bacteria and fabricated microswimmers swim at low Reynolds number, a regime where the effect of hydrodynamics can be counter intuitive. This is equivalent to humans trying to move in a very viscous liquid like treacle. Inertia is unimportant: once the swimmer ceases to move it stops
instantly. The Stokes equations, which govern the zero Reynolds number limit, are invariant under time reversal and hence to move at all the microswimmer must have a swimming stroke which is irreversible in time.The current interest in microswimming has been fuelled both by advances in nanotechnology which have led to novel experiments aimed at fabricating microswimmers and micropumps, and by an
increasing ability to perform quantitative investigations of bacterial motion. I will describe research using analytic and numerical approaches to model swimming at low Reynolds number. We are interested in understanding the velocity fields of the swimmers and their dependence on the symmetry of the swimming stroke, the form and relevance of hydrodynamic interactions between
swimmers, and the anomalous statistics of passive tracers in dilute bacterial suspensions.

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