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Tea Seminar

Dynamics of swept shock-wave/turbulent-boundary-layer interactions

Event Type: 
Tea Seminar
Date and Time: 
Friday, November 1, 2019 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Michael Adler
Abstract: 

Swept shock-wave/turbulent-boundary-layer interactions (STBLIs) exhibit key dynamical differences from their spanwise-homogeneous counterparts, including the suppression of a dominant mechanism of low-frequency unsteadiness.

Attached eddies in turbulent channel flow: scale interactions and spectral energy transfer

Event Type: 
Tea Seminar
Date and Time: 
Friday, October 25, 2019 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Hyun Ji (Jane) Bae
Abstract: 

The resolvent formulation of McKeon & Sharma (2010) is applied to supersonic turbulent boundary layer flows in order to study the validity of Morkovin’s hypothesis, which postulates that high-speed turbulence structure in zero pressure-gradient turbulent boundary layers remains largely the sa

Scaling laws for compressible wall turbulence

Event Type: 
Tea Seminar
Date and Time: 
Tuesday, September 3, 2019 - 10:00am
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Andrew Trettel
Abstract: 

A recent mean velocity transformation (Trettel and Larsson 2016) converts compressible mean velocities into equivalent incompressible mean velocities.  This transformation works properly for channel flows but does not work properly for boundary layers.  A two-dimensional extension of this transfo

Stable and Accurate Filtering Procedures

Event Type: 
Tea Seminar
Date and Time: 
Friday, August 23, 2019 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Professor Jan Nordström
Abstract: 

The study of so called transmission problems in  [2] revealed that successful numerical filtering may include a delicate balance between the need to remove high frequency oscillations (filter often for accuracy) and the need to avoid possible growth  (filter seldom for stability).  In this talk w

Fractal dimension of transitional boundary layer spot interfaces detected by a self- organizing map

Event Type: 
Tea Seminar
Date and Time: 
Thursday, August 22, 2019 - 10:00am
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Zhao Wu
Abstract: 

An unsupervised machine-learning algorithm, the self-organizing map (SOM), is used to identify the turbulent boundary layer (TBL) and non-TBL regions in bypass transition.

Hydrodynamic stability of a premixed flame subjected to transverse shear

Event Type: 
Tea Seminar
Date and Time: 
Wednesday, August 21, 2019 - 10:00am
Location: 
CTR Conference Room 103
Speaker(s): 
Mr. Xiaoyi Lu, Ph.D. Candidate
Abstract: 

Lu presents findings on the hydrodynamic stability of a premixed flame subjected to transverse shear. The problem configuration is a situation of interest for laminar and turbulent flames when they travel into a region of shear.

Data-assisted Reduced-order Modeling of High-dimensional and Fully Turbulent Flows: Forecast and System Identification

Event Type: 
Tea Seminar
Date and Time: 
Friday, August 16, 2019 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Mohammad Amin Khodkar
Abstract: 

One-Dimensional (1D) Reduced-Order Models (ROMs) are developed for a 3D highly turbulent Rayleigh Bènard convection (RBC) system with Rayleigh number Ra=106, which is nearly 600 times larger than its critical value, while three general objectives are pursued: 1) Predicting the time-mean

High-Fidelity Simulation, Active Flow Control and Reduced Order Modeling of a Plunging Airfoil under Deep Dynamic Stall

Event Type: 
Tea Seminar
Date and Time: 
Friday, August 2, 2019 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Professor William R. Wolf
Abstract: 

Unsteady flows over plunging and pitching airfoils with large excursions in effective angle of attack exhibit the phenomenon of dynamic stall.

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