Fluid dynamics describes a wide range of phenomena, from supersonic aircraft and supernovae to the mixing of cream in a cup of coffee and the dripping of water from a leaky faucet. On Monday, September 16 at 1:30 p.m. PDT, join Berkeley Lab Senior Scientist John Bell for an exciting seminar on NERSC’s long history of supporting fluid dynamics research, with repercussions from that cup of coffee all the way out into space. Bell’s talk will is available to the public via Zoom.

An important characteristic of many flows of both scientific and technological significance is that the fluid velocity is much smaller than the speed of sound in the fluid. For these types of flows, referred to as low Mach number flows, we can exploit the separation of scales between velocity and sound speed to develop models and algorithms that are much more efficient than methods based on a generic fluid formulation. In this talk we will discuss the development of these types of models over the past four decades, elucidating how basic methodology for incompressible flow can be extended to low Mach number flows in atmospheric science, astrophysics and combustion. We will present a number of numerical examples that illustrate the development of these types of models and demonstrate how advances in both algorithms and HPC architectures have enabled simulations that would have been unheard of 50 years ago.

John Bell is a Senior Scientist in the Applied Mathematics and Computational Research Division at Berkeley Lab. His research focuses on the development and analysis of numerical methods for partial differential equations arising in science and engineering. He has made contributions in the areas of finite volume methods, numerical methods for low Mach number flows, adaptive mesh refinement, stochastic differential equations, interface tracking and parallel computing. He has also worked on the application of these numerical methods to problems from a broad range of fields, including combustion, shock physics, seismology, atmospheric flows, flow in porous media, mesoscale fluid modeling and astrophysics. He is a Fellow of the Society of Industrial and Applied Mathematics and a member of the National Academy of Sciences.

**About NERSC and Berkeley Lab**

The National Energy Research Scientific Computing Center (NERSC) is a U.S. Department of Energy Office of Science User Facility that serves as the primary high performance computing center for scientific research sponsored by the Office of Science. Located at Lawrence Berkeley National Laboratory, NERSC serves almost 10,000 scientists at national laboratories and universities researching a wide range of problems in climate, fusion energy, materials science, physics, chemistry, computational biology, and other disciplines. Berkeley Lab is a DOE national laboratory located in Berkeley, California. It conducts unclassified scientific research and is managed by the University of California for the U.S. Department of Energy. »Learn more about computing sciences at Berkeley Lab.