Point forces in lattice Boltzmann: Approaching unsettled questions in sedimentation and learning to swim

Condensed Matter lunchtime seminar

Point forces in lattice Boltzmann: Approaching unsettled questions in sedimentation and learning to swim

  • Event time: 1:00pm
  • Event date: 19th March 2007
  • Speaker: Rupert Nash (Formerly School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details

Considering the sedimentation of a suspension of mono-disperse hard spheres at low Reynolds number, a simple theory predicts that velocity fluctuations about the mean should diverge with system size. Experiments on the contrary show them to saturate. Several theories attempt to explain this disagreement in terms of hydrodynamic screening, but experiment and simulation have been unable to distinguish them due to practical and computational limit on system sizes. We have devised a highly efficient point-particle approximation using the lattice Boltzmann method, which should allow us to scale to several orders of magnitude larger systems than any extant method.

This method also has applications to the simulation of swimming micro-organisms and I will explain our minimal model of a swimmer.

This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..

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