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Tea Seminar

Direct numerical simulation of turbulent flow and heat transfer in a spatially developing turbulent boundary layer laden with small solid particles

Event Type: 
Tea Seminar
Date and Time: 
Friday, October 19, 2018 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Dong Li
Abstract: 

Turbulent flows laden with particles are widely encountered in a great number of natural physical processes and in a host of industrial and environmental applications.

Color of Turbulence: Low-complexity stochastic dynamical modeling of turbulent flows

Event Type: 
Tea Seminar
Date and Time: 
Friday, October 5, 2018 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Armin Zare
Abstract: 

This talk describes how to account for second-order statistics of turbulent flows using low-complexity stochastic dynamical models based on the linearized Navier-Stokes (NS) equations.

Direct numerical simulation of grid-element turbulence and its effect on heat transfer

Event Type: 
Tea Seminar
Date and Time: 
Friday, May 18, 2018 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Immanuvel Paul
Abstract: 
Fractal-grid-generated turbulence has gained considerable attention in the past decade owing to its novel unique characteristics including the nonequilibrium energy cascade present in the near field.

Wall-less wall-bounded turbulence

Event Type: 
Tea Seminar
Date and Time: 
Friday, April 27, 2018 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Adrian Lozano-Duran
Abstract: 

At first sight, walls appear as the most relevant ingredient in turbulence confined or limited by solid surfaces, and it seems plausible to assume that they should be the origin and organizing agent of wall-bounded turbulence.  Consequently, many efforts have been devoted to understand the struct

On fractional derivative closures for turbulence: a critical evaluation

Event Type: 
Tea Seminar
Date and Time: 
Friday, April 6, 2018 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Perry Johnson
Abstract: 

Turbulence modeling has traditionally relied heavily on the eddy viscosity concept relating turbulent fluxes to local gradients. Important deficiencies of the eddy viscosity concept include its inability to capture non-local and memory effects of turbulence.

Nonlinear stability analysis of plane shear flows and related flow control

Event Type: 
Tea Seminar
Date and Time: 
Friday, March 16, 2018 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Zhu Huang
Abstract: 

The minimal seeds (the disturbance with the lowest energy which triggers turbulence) for plane shear flows have been captured by the variational method dealing with the nonlinear Navier-Stokes equations.

Turbulence in a microchannel

Event Type: 
Tea Seminar
Date and Time: 
Friday, March 2, 2018 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Professor V. Kumaran
Abstract: 

It is well known that the transition from a laminar to a turbulent flow takes place in a rigid tube takes place at a Reynolds number of about 2100, and in a rigid channel at a Reynolds number of about 1200.

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