Interaction of a finite‐size particle with the moving lid of a cavity

The motion of a solid particle in a lid‐driven cavity is investigated. If the tangential velocity of the lid is large the streamlines are dense near the moving lid and the finite size of a particle can have a profound effect on its trajectory. To assess this effect different particle‐motion models are examined: inertial point particles (Maxey–Riley equation) one‐way coupled to the flow and finite‐size particles the flow around which is fully resolved (two‐way coupling). We compare the corresponding trajectories with those obtained using the particle–surface interaction model originally introduced by Hofmann and Kuhlmann [Phys. Fluids 23, 0721106 (2011)]. The finite‐size effect on the particle's trajectory is quantified and discussed. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)