March 31, 2017: Lagrangian Coherent Structures and DNS with Discontinuous Galerkin methods

Prof. Dr. Gustaaf Jacobs
Professor of Aerospace Engineering
Director of the Center for Industrial Training and Engineering Research (CITER)
Affiliate at the Computational Science Research Center (CSRC)
San Diego State University

TIME: 11.00 – 12.00

PLACE: CLA J 24, ETH Zürich

Abstract:
High-fidelity numerical tools based on high-order Discontinuous-Galerkin (DG) methods and Lagrangian Coherent Structure (LCS) theory for the study of separated, vortex-dominated flows are discussed. A numerical framework is presented that couples a higher-order DG-DNS solver with time-dependent analysis of the flow through LCS . At heart of this framework lies an algorithm that computes  Finite-Time Lyapunov Exponent (FTLE) fields simultaneously with DNS and with spectral accuracy. The algorithm is applied to investigate the role of LCS in fluid mixing in the unstable bottom boundary layer under a solitary surface wave mimicked by a soliton-like pressure gradient driven flow in an oscillating water tunnel. The development of wwo and three-dimensional LCS fields for the unsteady separated flow over a NACA 65-(1)412 airfoil at a free-stream Reynolds number of Re=20,000 is also discussed.

This talk is organised by the Institute of Mechanical Systems (IMES).

IMES organised talk

Updated on 2021-09-16T08:56:25+02:00, by Susanne Lewis.