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TRACKING COHERENT STRUCTURES IN MASSIVELY-SEPARATED AND TURBULENT FLOWS

Yangzi Huang
Department of Mechanical and Aerospace Engineering Syracuse University Syracuse, NY

Matthew Rockwood
Department of Mechanical and Aerospace Engineering Syracuse University Syracuse, NY

Melissa A. Green
Department of Mechanical and Aerospace Engineering Syracuse University Syracuse, NY

Resumo

Coherent structures are tracked in three simulations of massive-separated or turbulent flow. Topological saddle points are found using intersections of the postiveand negative-time Lagrangian coherent structures, and these points are then followed as the flow evolves in order to track individual structures. In the cases of a 2D flat plate undergoing a 45° pitch-up maneuver and a circular cylinder in cross-flow, tracking saddle points showed a rapid acceleration of the structure as it shed from the plate or cylinder surface. For a simulation of wall-bounded turbulence in a channel flow, tracking the LCS saddle points shows that average structure convection speed exhibits a similar trend as a function of wall-normal distance as the mean velocity profile.