[Faculty] Fwd: [CSRC-SDSU COLLOQUIUM]: Lagrangian Coherent Structures and DNS with Discontinuous Galerkin methods

Wed Apr 6 23:01:42 PDT 2016

*DATE*:  Friday, April 8th, 2016

*TITLE*:  Lagrangian Coherent Structures and DNS with Discontinuous
Galerkin methods

*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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