Shock-Induced Size Segregation of Bidisperse Particles

The interaction of a planar shock wave with a suspension of bidisperse particles is examined using high-fidelity simulations over a range of shock Mach numbers ([Formula: see text]), particle volume fractions ([Formula: see text]), and particle diameter size ratios ([Formula: see text]) between large ([Formula: see text]) and small ([Formula: see text]) particles. The study aims to quantify the effects of these parameters on size segregation and particle curtain spread. A hybrid numerical framework is developed, combining an immersed boundary method for large particles with Lagrangian particle tracking of small particles. The gas-phase equations are discretized using a high-order, energy-stable finite difference scheme with localized shock capturing. Contact between particles is handled using a soft-sphere collision model with an efficient neighbor detection algorithm to capture collisions between particles of varying sizes. Results indicate that size segregation increases with increasing [Formula: see text] and decreasing [Formula: see text]. Additionally, segregation exhibits a weak proportionality to the size ratio [Formula: see text] across the range of conditions and time horizons considered. Streamwise profiles of the mean particle volume fraction reveal a pronounced downstream spread of smaller particles compared to larger ones.