Applied Math Seminar

Date: Friday September 9

Time: 11:00am-11:50am

Location: GP 346

Speaker: Denis Aslangil (Department of Aerospace Engineering and Mechanics, The University of Alabama)

Title: High-fidelity simulations of multi-physics turbulent flows

Abstract:  In the real world, turbulence occurs in multi-material/phase flows, which in most cases involve materials with large density differences. Unlike incompressible single-fluid flows, the velocity field in multi-material flows with compositional variations is tightly coupled with the density field. These flows are called variable density (VD) flows. Such flows are of broad interest due to their occurrence in the form of Rayleigh-Taylor and Richtmyer-Meshkov instabilities, combustion applications in ramjet engines, high energy density processes like inertial confinement fusion (ICF), and convection regions in the atmosphere, oceans, and the Earth’s mantle. In this talk, the results of extremely large-resolution (domain size up to 2048^3) direct numerical simulations (DNS) of buoyancy-driven homogeneous VD turbulence will be presented to show the highly asymmetric VD flow development at large density ratios. In addition, Dr. Aslangil will discuss his research group’s current research directions at UA. His group aims to best use state-of-the-art computational tools to unravel novel physical insights of multi-physics turbulence, improve turbulence theory, and adapt the findings to develop efficient physics-informed engineering models.