Fluids containing small immiscible particles has a wide variety of scientific and engineering applications: dispersion of contamination in the atmosphere, fluidization in combustion processes, deposition of aerosols in aerosol drugs, spread of virus in the air, rain formation in clouds, sand and dust storms, protoplanetary disks, volcanic eruptions, geological sedimentation processes, pharmaceutical sprays, liquid-fueled combustion, solid rocket motors, coal furnaces, and particle-based solar receivers are examples of engineering processes that involve particle-laden flows among many others. The multiscale and nonlinear interactions between the fluid and the dispersed particles lead to complex flow physics and pose unique modeling challenges. Also, many of these flows involve turbulence. The simultaneous presence of two of the most challenging topics in fluid mechanics, namely multiphase flows and turbulence, is still an unsolved problem.