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SUMMARY:Stokes drift and impurity transport in a quantum fluid - Davide Pr
 oment (University of East Anglia)
DTSTART:20221213T110000Z
DTEND:20221213T120000Z
UID:TALK193738@talks.cam.ac.uk
DESCRIPTION:Stokes drift is a classical fluid effect in which travelling w
 aves transfer momentum to tracers of the fluid\, resulting in a non-zero d
 rift velocity in the direction of the incoming wave. This effect is the dr
 iving mechanism allowing particles\, i.e. impurities\, to be transported b
 y the flow\; in a classical (viscous) fluid this happens usually due to th
 e presence of viscous drag forces. Because of the eventual absence of visc
 osity in quantum fluids\, impurities are driven by inertial effects and pr
 essure gradients only. We present theoretical predictions of a Stokes drif
 t analogous in quantum fluids for classical impurities obtained using mult
 i-time analytical asymptotic expansions. We find that\, at the leading ord
 er\, the drift direction and amplitude depend on the initial impurity posi
 tion with respect to the wave phase\; at the second order\, dominant after
  averaging over initial conditions\, our theoretical model recovers the cl
 assical Stokes drift but with a coefficient that depends on the relative p
 article-fluid density ratio. Numerical simulations of a two-dimensional Gr
 oss-Piteaveskii equation coupled with a classical impurity corroborate our
  findings. Our predictions are experimentally testable\, for instance\, us
 ing fluids of light obtained in photorefractive crystals.\n(joint work wit
 h Umberto Giuriato\, Giorgio Krstulovic\, and Miguel Onorato)
LOCATION:Seminar Room 2\, Newton Institute
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