Beyond the Point Particle: LES-Style Filtering of Finite-Sized Particles.

Multiphase LES-style spatial filtering provides a rigorous means of modeling flow over computationally-unresolved particles and droplets, without recourse to the point-particle limit. As such, it can be used to investigate the validity of point-particle models for particles of finite sizes, and to provide refinements to point-particle models. We present results for the specific case of solid spherical particles, illustrating that the significant deviations from the point-particle assumption occur even for quite small particles, and that the addition of a dipole component to the standard single-point force provides a substantially improved model.