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LANS Seminar
August 30, 2023 @ 10:30 - 11:30 CDT
Seminar Title: PDE-based methods for efficient multiscale gas dynamics simulations
Speaker: Raag Ramani, PhD student Applied Mathematics, UC Davis
Date/Time: August 30, 2023/10:30 AM-11:30 AM
Location: See Meeting URL on the cels-seminars website which requires Argonne login.
Host: Hara Iakovidou
Description: We present a new numerical framework for simulating fluid flows in multiple space dimensions, and an associated set of algorithms that are (a) high-order accurate, (b) flexible and applicable to a variety of flow configurations, (c) highly efficient, running an order of magnitude faster than traditional solvers, and (d) simple to implement. Our methodology is founded upon a number of PDE-based modifications to the underlying compressible Euler system, including a nonlinear artificial viscosity stabilization technique, an asymptotic model for unstable contact discontinuities, and a smooth dynamic adaptive mesh redistribution procedure. We will show a number of adaptive simulations of well-known and difficult gas dynamics problems, including strong shocks and unstable contact discontinuities. With the ability for our algorithms to ”zoom-in” on small-scale vortical structures, our algorithm is the first to provide a speed-up of low-resolution adaptive simulations over high-resolution uniform simulations of comparable quality for unstable Rayleigh-Taylor problems. This is joint work with Steve Shkoller at UC Davis.
Bio: Raag Ramani is a PhD student in the Applied Mathematics department at UC Davis. His research focuses on the development of numerical algorithms for simulating fluid flows, including high-resolution shock-capturing methods, adaptive meshing, multiscale modeling and simulation, vortex methods, and combustion & complex physics.
Please note that the meeting URL for this event can be seen on the cels-seminars website, which requires an Argonne login.
See all upcoming talks at https://www.anl.gov/mcs/lans-seminars