October 7, 2019: “Effective Post-processing of Large Complex Turbulent Databases”

  • October 7, 2019
  • 4:00 p.m.
  • 210 Robeson Hall
  • Dr. Datta Gaitonde, Ohio State University
  • Faculty Host: Dr. Pradeep Raj

Abstract: Carefully generated datasets from high-fidelity simulations and experiments contain all pertinent spatio-temporal scales of interest in turbulent flows. As such, they constitute truth models of the underlying engineering and scientific phenomena of interest. However, the extraction of physics insights from such datasets remains a daunting task because of
their massive sizes. It is thus necessary to develop a suite of mathematical techniques, and associated software, to unlock the desired information. The events or characteristics of interest depend on the phenomena of interest, and depend on the speed regime and configuration complexity. In this talk, recent efforts to develop and apply various analysis techniques to Large-Eddy Simulation (LES) data will be summarized in the context of static
and dynamic stall, jet noise, shock/turbulent interactions, and hypersonic transition. Some of these approaches essentially decompose the data in different ways to highlight various aspects of the dynamics, and may be generally classified as data-driven (agnostic of the underlying governing equations) or operator-aware. Others extract information about the underlying instabilities that drive the observed dynamics. The principle
strengths of each post-processing technique will be highlighted through examples of how they may be used to generate insights into the physics, establish guidelines for flow control, extract global stability modes of mean and unsteady basic states and identify intermittent events that can remain hidden with traditional statistical methods.

Bio: Dr. Datta V. Gaitonde holds the John Glenn Chair and is an Ohio Research Scholar in the Mechanical and Aerospace Engineering Department. His group has diverse research interests, including shock/turbulent interactions, jet noise, hypersonic transition, flow control, bluff body flows, scramjet flowpaths and algorithm development. He has over 300 publications in journals, conferences and books and has delivered numerous national and
international presentations. He is Deputy Editor of the AIAA Journal and a Fellow of the Air Force Research Laboratory, ASME and AIAA.