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Tea Seminar

Hydrodynamics of migrating zooplankton aggregations

Event Type: 
Tea Seminar
Date and Time: 
Friday, January 24, 2020 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Isabel Houghton
Abstract: 

Biologically generated turbulence has been proposed as an important contributor to nutrient transport and ocean mixing. However, for swimming animals to produce non-negligible transport and mixing, they must produce eddies at scales comparable to the length scales of stratification in the ocean.

Time-Accurate and highly-Stable Explicit (TASE) operators for stiff differential equations

Event Type: 
Tea Seminar
Date and Time: 
Friday, January 10, 2020 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Maxime Bassenne
Abstract: 

Unconditionally stable implicit time-marching methods are powerful in efficiently solving stiff differential equations. In this talk, I will present a novel unified framework for handling both physical and numerical stiffness based on Time-Accurate and highly-Stable Explicit (TASE) operators.

Interface dynamics: mechanisms of stabilization and destabilization and structure of flow fields

Event Type: 
Tea Seminar
Date and Time: 
Friday, December 13, 2019 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Professor and Chair Snezhana I. Abarzhi
Abstract: 

Interfacial mixing and transport are nonequilibrium processes coupling kinetic to macroscopic scales. They occur in plasmas, fluids, and materials over celestial events to atoms. Grasping their fundamentals can advance a broad range of disciplines in science, mathematics, and engineering.

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.

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