Center for Environmental and Applied Fluid Mechanics Seminar: Myoungkyu Lee

Description

The Center for Environmental and Applied Fluid Mechanics (CEAFM) presents Myoungkyu Lee, an assistant professor of aerospace engineering and mechanics at the University of Alabama, who will present "What Are We Learning from the DNS of Wall-Bounded Turbulence at High Reynolds Numbers?" in this week's CEAFM seminar, hosted by Associate Professor Dennice Gayme, from the Johns Hopkins Department of Mechanical Engineering.

Abstract:

Nearly all moving objects on Earth pass through fluids, and many of them move at high speed. This makes high Reynolds Number Re wall-bounded turbulent flows of great technological importance. High spatial and temporal resolution is required to study these flows due to the multi-scale nature of turbulence. Direct numerical simulation (DNS) is a technique in which the Navier-Stokes equations, the governing equations of fluid flow, are solved with sufficient resolution to represent all scales of turbulence. Therefore, DNS is very expensive and always limited by computational capabilities. DNS of incompressible turbulent channel flow at friction Reynolds numbers Re𝜏 up to 5200 have been performed with more than 500,000 processors to study high Re wall-bounded turbulence. In this presentation, we will discuss the characteristics of high Re wall-bounded flows with simulation results from turbulent Poiseuille and Couette flows.