DATE:

Friday, March 11, 2022

TIME:

3:30 PM

LOCATION:

GMCS 314

SPEAKER:

Dr. Perry Johnson, Mechanical and Aerospace Engineering, University of California, Irvine

ABSTRACT:

The phenomenon of turbulence in fluid flows is a paradigmatic nonlinear multiscale dynamical system in classical physics with important implications for a wide range of natural and engineered flows. Brute force simulations of many societally-relevant turbulent flows are far out of reach even on today’s world-class supercomputers, and this will remain the case for the foreseeable future. As a result, turbulence modeling plays a central role in advancing the state-of-the-art for computational fluid dynamics. A promising, and increasingly popular approach to turbulence modeling is Large-Eddy Simulation (LES). In LES, the large-scale turbulent fluctuations of a given flow are directly resolved and approximate models are constructed to represent the net effects of smaller-scale motions. One of the primary tasks of LES sub-grid scale models is to remove kinetic energy from resolved scales in an accurate manner. In this talk, I will review the scale-wise dynamics of kinetic energy in turbulent flows as it relates to modeling and simulation. A new perspective on the underlying theory of LES will be introduced, advancing our fundamental understanding of turbulence physics and suggesting a new framework for extending the effectiveness of LES to more complex flows.

HOST:

Jose Castillo

VIDEO: