title: Interaction of solid particles with a tangle of vortex filaments in a viscous fluid.
abstract: Homogeneous isotropic turbulence consists of coherent filamentary vortex structures superimposed to a more incoherent background. The question which we address is the effect of these structures on the dynamics of small, neutrally buoyant solid particles. Rather than generating the turbulence by direct numerical simulation (DNS) of the Navier-Stokes equations, we use a model of turbulence based entirely on viscous vortex filaments which interact via inertial forces and reconnect with each other. Using this model, we show that solid particles can become trapped around vortex filaments, something difficult to achieve with DNS. Unlike most studies, we have not neglected inviscid inertial effects. By comparing the Stokes, local, and convective components of the particle's acceleration, we also show that the convective part clearly identifies the trapping.
authors.affiliation: Center for Risk Studies and Safety, University of California, Santa Barbara, California 93117, USA.
authors.forename: Demosthenes
authors.initials: D
authors.lastname: Kivotides
authors.forename: Carlo F
authors.initials: CF
authors.lastname: Barenghi
authors.forename: Antony J
authors.initials: AJ
authors.lastname: Mee
authors.forename: Yuri A
authors.initials: YA
authors.lastname: Sergeev