Effects of angularity on particle dynamics

Fluid-particle interaction is crucial in understanding particle mobility and transport. Typical models for sediment transport consider the particles as spheres which are generally simple to resolve due to their geometrical isotropy. While idealized spherical and smooth ellipsoidal particles are commonly studied, natural sediment grains often exhibit angularity, which can alter their dynamic and kinematic behavior. In this study, direct numerical simulations of oscillatory flow with suspended particles were conducted where the angular particles are modeled as octahedrons using the Immersed Boundary Method. Two-way coupling was implemented between the flow and the particle considering combined translational and rotational motion. Initial results reveal shape-dependent differences in particle motion under an oscillatory flow, with differences in both translational drift and rotational motion such as tumbling and spinning. Interactions and effects of multiple angular particles are also investigated.