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SUMMARY:The role of elasticity for swimming micro-organisms
DTSTART:20150909T133000
DTEND:20150909T143000
DTSTAMP:20260916T005320Z
UID:9169bbd5d29b0000e8d135fc12bd83b6a46dfedd5b8451192881d33a
CATEGORIES:Conferences - Seminars
DESCRIPTION:Eric Lauga\, University of Cambridge\nBio: since 2013: Fellow 
 and College Lecturer in Mathematics - Trinity College\, Cambridge\nsince 2
 013: University Senior Lecturer - University of Cambridge\n2010-2013: Asso
 ciate Professor - University of California\, San Diego (USA)\n2007-2010: A
 ssistant Professor - University of California\, San Diego (USA)\n2006-2007
 : Assistant Professor - Massachusetts Institute of Technology (USA)\n2005-
 2006: Postdoctoral Associate - Massachusetts Institute of Technology (USA)
 \n2005: Lecturer - Harvard University (USA)\nMany microbes (for ex. bacter
 ia or green algae) possess flagella\, slender whiplike appendages which ar
 e actuated in a periodic fashion in fluids and allow the cells to self-pro
 pel. We consider two problems in which elasticity of the flagella play a c
 rucial role in the physics of locomotion. First\, motivated by recent expe
 riments\, we consider the problem of microbial locomotion in complex\, non
 -Newtonian fluids. While past theoretical work seems to indicate that visc
 oelasticity should systematically hinder locomotion\, experimental observa
 tions suggest that locomotion enhancement is possible. In this talk\, we p
 resent an overview of experimental results on the topic and propose a phys
 ical mechanism leading to enhanced swimming\, which we quantify mathematic
 ally. Second\, we consider the problem of bacterial bundling of bacterial 
 swimming. Bacteria possess multiple flagella which interact hydrodynamical
 ly\, synchronize\, and can form a tight bundle behind a swimming cell. Mos
 t past theoretical work has approached the problem of bundling using numer
 ical computations. Here\, we present an asymptotic treatment of the intera
 ctions between elastic rotating filaments. We first show how to asymptotic
 ally compute the hydrodynamic kernels governing hydrodynamic interactions 
 in the case of long filaments\, and we then use these results to derive th
 e nonlocal\, nonlinear\, equations of motions of each filament.
LOCATION:ME B10 http://plan.epfl.ch/?lang=en&zoom=20&recenter_y=5864108.22
 894&recenter_x=731002.1372&layerNodes=fonds\,batiments\,labels\,informatio
 n\,parkings_publics\,arrets_metro\,transports_publics&floor=1&q=ME_B10
STATUS:CONFIRMED
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