Elastoinertial chains in a two-dimensional turbulent flow

Sedimenting Elastic Filaments in Turbulent Flows

“…This prediction, for the case of rigid chains in 3D, was recently confirmed experimentally [34]. The introduction of inertia (without gravity), counter-acts this tendency due to centrifugal expulsion from vortices and decorrelation from the flow, resulting in rather distinct dynamics [28]. Here, we account for gravitational acceleration and investigate the settling dynamics of these elasto-inertial chains.…”

“…A simple model of a long filament, which retains enough internal structure to exhibit both elasticity and inertia, is a chain of heavy inertial particles connected through elastic springs [26]. Such chains are a useful framework to understand the intricate interplay between elasticity and turbulent mixing [27][28][29] and provide insights which complement those obtained from other models of fibres [30][31][32][33]. In this context, the most striking feature of filaments such as those we study is the manner in which they preferentially sample the geometry of a turbulent flow: in the inertia-less (neutrally buoyant) limit, such chains preferentially sample the vortical regions of the flow, in both two and three dimensions (3D) though for different reasons [27,29].…”

Dynamics of a long chain in turbulent flows: impact of vortices

“…We consider a chain consisting of N b identical inertialess beads (see [21] for a study of chains with inertial beads in 2D turbulent flows), each of which has a Stokes drag coefficient ζ . The beads are connected to their nearest neighbours by nonlinear springs, with equilibrium length r eq , maximum length r m and spring coefficient κ .…”