Dynamics, wakes, and regime transitions of a fixed angular particle in an unbounded inertial flow. II. From tetrahedron to sphere

We compute the unbounded flow past a fixed Platonic polyhedron at a Reynolds number ranging from 100 to 500 and investigate the effects of angularity and angular position of the Platonic polyhedron on the flow field. In the steady regime, the flow symmetry in the particle wake is determined by the particle front surface. Our study reveals the intrinsic relationship between angular edges and hairpin vortex generation, clarifies the effects of particle angularity on the flow regime transitions, and highlights the crucial role of the flow recirculation region in determining the vortex shedding mode.