TITLE:

Lagrangian Coherent Structures and DNS with Discontinuous Galerkin methods

DATE:

Friday, April 8th, 2016

TIME:

3:30 PM

LOCATION:

GMCS 214

SPEAKER:

Dr. Daniel Nelson. Senior Research and Development Engineer at Flowserve Corporation.

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 two 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.

HOST:

Dr. Satchi Venkataraman

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