Mechanical and Civil Engineering Seminar
*Connection details for this online presentation will be posted when available.
Disperse two-phase flows are composed of liquid droplets or solid particles suspended in a carrier fluid. Examples of such flows are numerous within engineering and science. While the past several decades have seen significant progress in developing predictive modeling capabilities, largely due to the advent of high-performance computing, the majority of these efforts have focused on dilute suspensions of particles under low-speed (incompressible) conditions. This talk will focus on recent progress towards understanding and predicting particle-laden flows in more extreme environments, in which gas-phase compressibility and back-coupling from particles to the fluid have an order-one effect. Some relevant examples include solid propellant combustion, coal dust explosions, volcanic eruptions, and the fluidization of regolith from a rocket exhaust plume during planetary/lunar landing. The latter example acts as the primary motivation of this talk. We will examine the fundamental processes of turbulent particle-laden flows, including state-of-the-art phenomenology from experimental observations, existing theories, and simulation techniques. New numerical methods uniquely designed to address this class of flows will be presented, in addition to high-resolution simulations that allow us to probe turbulence and Mach number effects at the sub-particle scale and at scales that encompass millions of particles.