Anthony Wachs, University of British Columbia

Title: On the Dynamics of Flows Laden with Angular Rigid Bodies

Abstract

I discuss recent results on the dynamics of a single angular rigid body of aspect ratio 1 immersed in the flow of a Newtonian fluid. I analyze various data sets generated by Particle Resolved Direct Numerical Simulations that pertain to three specific flow configurations: (i) the flow past a stationary rigid body, (ii) a rigid body settling in an otherwise quiescent fluid, and (iii) a rotating and moving rigid body. We use a Distributed Lagrange Multiplier/Fictitious Domain method combined to octree adaptive mesh refinement to properly capture the vorticity generation in the boundary layer around the angular rigid body that is key to the wake dynamics. In all cases, the Reynolds number computed with the rigid body characteristic length lies in the interval [10,400] where inertia is dominant. We examine these flows in terms of hydrodynamic force and torque, trajectory path and wake structure. This work contributes to clarify the role of particle angularity in rigid particle-laden flows.