MAE Seminar: The Treatment of Turbulence in Extreme-Scale Simulation of Complex Fluid Dynamic Applications


12:30 pm-1:45 pm
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MAE-A Room 303
939 Sweetwater Drive
Gainesville, FL 32611


Robert Moser
University of Texas, Austin

12:30 pm – Coffee & Cookies
12:45 pm – Seminar MAE-A 303

The advent of extreme-scale (exa-scale) computing enables the simulation of
turbulent fluid dynamic systems of unprecedented complexity. An excellent
example is the simulation of an array of wind turbines. The performance of
a turbine in such an array depends on dynamics of very small-scale
turbulence in boundary layers on the turbine blades, and the interaction of
the turbine with turbulent wakes of upstream turbines. Even with exascale
resources, the turbulence cannot be directly simulated, and so modeling is
required, and Large Eddy Simulation (LES) and hybrid RANS/LES have the
best chance to represent the complex turbulence dynamics. However, the
complex features of these flows put particular stresses on LES, introducing
a number of challenges in both subgrid modeling and numerical
discretization including: 1) modeling the subgrid contribution to the mean
Reynolds stress, 2) the effects of numerical dispersion on the energy cascade,
and 3) the effects of inhomogeneous LES resolution. In this talk, we will
discuss both the motivating exascale wind-turbine simulations, and the LES
modeling and discretization challenges and potential solutions.

Robert Moser holds the W. A. “Tex” Moncrief Jr. Chair in Computational Engineering and Sciences
and is professor of mechanical engineering in thermal fluid systems at the University of
Texas at Austin. He serves as the director of the Oden Institute’s Center for Predictive
Engineering and Computational Sciences (PECOS) and deputy director of the Oden Institute.
Moser earned his Ph.D. in mechanical engineering from Stanford University. Before coming to The
University of Texas at Austin, he was a research scientist at the NASA- Ames Research Center and
then a professor of theoretical and applied mechanics at the University of Illinois.
Moser has pursued applications to such diverse systems as wind energy, plasma systems,
reentry vehicles, solid propellant rockets, micro-air vehicles, and the human cardiovascular
system. Moser is a fellow of the American Physical Society, and was
dal for Exceptional Scientific Achievement.


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Sivaramakrishnan Balachandar