Ricerc@Sapienza

Direct numerical simulations (DNS) are carried out to study turbulence dynamics in the separation bubble in lower curved wall channels. Boundary layer separation consists of fluid flow around bodies becoming detached, which causes the fluid closest to the object’s surface to flow in reverse or different directions, most often giving rise to turbulent flow. The study of turbulence and boundary layer separation has long

Particle-laden turbulent flow that separates due to a bump inside a channel is simulated to analyze the effects of the Stokes number and the lift force on the particle spatial distribution. The fluid friction Reynolds number is approximately 900 over the bump, the highest achieved for similar computational domains. The presence of the bump creates a complex background flow with a recirculating region and a strong shear layer. A range of particle Stokes numbers are considered, each simulated with and without the lift force in the particle dynamic equation.