Wed, Oct 06, 2021 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Diego Donzis, TAMU
Talk Title: Rethinking Compressible Turbulence: From New Regimes to Extreme Simulations
Abstract: Compressible turbulence is much more common than incompressible turbulence and plays a critical role in countless natural and engineering systems such as astrophysical flows, high-speed aerodynamics, turbulent combustion, among many others. However, much less is known about compressible turbulence due to its larger parameter space; the additional complexity associated with coupling between hydrodynamics and thermodynamics; and the greater challenges to develop theory, attain realistic conditions in simulations, and conduct carefully controlled experiments.
In the first part of this talk I will review recent work that highlights some qualitative differences observed in compressible turbulence using a massive database of very well-resolved direct numerical simulations. After some illustrations of specific compressibility effects on turbulent flows, I will show why current approaches as "corrections" to well-known laws in incompressible turbulence present fundamental problems and then `provide a new alternative interpretation of statistical equilibria in an expanded parameter space in which new compressible universal scaling laws can be found. In the second this part, I will present current computational challenges to achieve more realistic conditions and a novel numerical approach in which the main well-known obstacles towards simulations on exascale systems and beyond can be removed. We will present some examples for smooth flows as well as flows with shocks and reactions.
Biography: Diego A. Donzis is an associate professor and Director of Graduate Programs in the Department of Aerospace Engineering at Texas A&M University where he directs the Turbulence and Advanced Computations Lab (TACL). He received his PhD from the Georgia Institute of Technology and continued his research at the University of Maryland and the International Centre for Theoretical Physics, Italy. His main interests are in high-performance computing at extreme scales, and the physics of turbulence and turbulent mixing in incompressible and compressible flows. Among his major recognitions Dr. Donzis received an NSF CAREER award, the Francois Frenkiel Award from the American Physical Society, TAMU Dean of Engineering Excellence Award, three TEES Faculty Awards for research, the McElmurry Teaching Excellence Award, and is a best graduate from Argentina by the National Academy of Engineering. In 2018, he was named a Presidential Impact Fellow by Texas A&M University for his scholarly influence. He is an AIAA Associate Fellow.
Host: AME Department
More Info: https://usc.zoom.us/j/97427241653?pwd=UGd2aXY2b3dsQkxMdzdvcnNBMjRJZz09
Location: Seaver Science Library (SSL) - 202
Audiences: Everyone Is Invited
Contact: Tessa Yao