Turbulent Transport of Extended and Interacting Particles: Beyond the Spherical Particle Approximation
Nordita Astrophysics seminars
Wednesday 13 February 2019
S.S. Ray (International Center for Theoretical Sciences, Tata Institute of Fundamental Research, Bangalore)
A string of tracers, interacting elastically, in a turbulent flow,
shows a dramatically different behaviour when compared to the non-interacting
case. Such an elastic chain shows strong preferential sampling of the turbulent
flow unlike the usual tracer limit: an elastic chain is trapped in the vortical
regions. The degree of preferential sampling and its dependence on the
elasticity of the chain is quantified via the Okubo-Weiss parameter. The effect
of modifying the deformability of the chain, via the number of links that form
it, is also examined. We then end with recent results which suggest that
suitable choice of particle interactions can lead to either crystalline phases
in particle-aggregates or collective behaviour reminiscent of flocking in the
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