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Modeling velocity gradients along particle trajectories in turbulence

Event Type: 
Date and Time: 
Friday, September 29, 2017 - 16:30
Location: 
CTR Conference Room 103
Event Sponsor: 
Parviz Moin, Director of Center for Turbulence Research
Speaker(s): 
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.

Bio: 
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.