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Modeling velocity gradients along particle trajectories in turbulence

Event Type: 
Date and Time: 
Friday, September 29, 2017 - 16:30
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Dr. Perry Johnson

The dynamics of velocity gradients in turbulent flows not only represent an attractive way to explore theoretical issues such as intermittency, but also prove important for a number of micro-physical processes that occur in turbulent environments. Inspired by the qualitative success of the restricted Euler model for Lagrangian evolution of velocity gradients, this talk will introduce a stochastic Lagrangian model carefully constructed for homogeneous isotropic turbulence. Using the local isotropy hypothesis, it will be demonstrated how such a model can be applied in large-eddy simulations (LES) to capture important sub-grid micro-physics. Extensions to higher Reynolds numbers (intermittency) as well as inertial particle trajectories will also be considered.

Dr. Perry Johnson recently finished his PhD in Mechanical Engineering at Johns Hopkins and joined CTR as a postdoctoral scholar this September 2017. His research interests include small-scale turbulence, particle-laden flows, and near-wall dynamics.