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CTR Tea

At last, Turbulence closure modeling minus tuning parameters!

Event Type: 
CTR Tea
Date and Time: 
Friday, January 22, 2021 - 4:30am
Location: 
Zoom
Speaker(s): 
Prof. Parviz Moin
Abstract: 

In the immediate aftermath of the 1990 Summer Program, there was a flurry of activities at CTR seeking to exploit the dynamic modeling concept in canonical turbulent flows which heretofore had challenged the universality of turbulence models.

A model is born

Event Type: 
CTR Tea
Date and Time: 
Friday, January 15, 2021 - 4:30pm
Location: 
Zoom
Speaker(s): 
Prof. Ugo Piomelli
Abstract: 

It was a sunny morning in July 1990, the first week of the CTR Summer Program, Massimo Germano, Parviz Moin, Bill Cabot and Ugo Piomelli met to discuss the possible uses of an identity that Massimo Germano had recently derived.

Flow and Ignition Dynamics Following Laser-induced Breakdowns

Event Type: 
CTR Tea
Date and Time: 
Friday, November 20, 2020 - 4:30pm
Location: 
Zoom
Speaker(s): 
Dr. Jonathan Wang
Abstract: 

Laser-induced breakdown is a versatile means of depositing energy in a fluid and a promising alternative to conventional electrode-spark ignition for combustion systems.  Using numerical simulations we analyze the flow dynamics following the laser pulse and show that it is sensitive to even subtl

Investigation of direct combustion noise in turbulent premixed jet flames using DNS

Event Type: 
CTR Tea
Date and Time: 
Friday, November 6, 2020 - 4:30pm
Location: 
Zoom
Speaker(s): 
Dr. Davy Brouzet
Abstract: 

Direct combustion noise plays a key role in the triggering and dynamics of thermo-acoustic instabilities of modern gas turbines. Moreover, many combustion devices can produce high levels of noise, while being subjected to stringent noise regulations.

Transcritical diffuse-interface hydrodynamics of propellants in high-pressure combustors of chemical propulsion systems

Event Type: 
CTR Tea
Date and Time: 
Friday, October 23, 2020 - 4:30am
Location: 
Zoom
Speaker(s): 
Dr. Javier Urzay
Abstract: 

Rocket engines and high-power new generations of jet engines and diesel engines oftentimes involve the injection of one or more reactants at subcritical temperatures into combustor environments at high pressures, and more particularly at pressures higher than those corresponding to the critical p

Shock-induced phenomena in turbulent flows through numerical simulation and diagnostics

Event Type: 
CTR Tea
Date and Time: 
Friday, September 25, 2020 - 4:30pm
Location: 
Zoom
Speaker(s): 
Professor Ivan Bermejo-Moreno
Abstract: 

Shock-induced scalar mixing and ignition under canonical shock-turbulence interactions (STI) will be considered first, by means of Direct Numerical Simulation in 3D and 2D, respectively.

Hydrodynamics of migrating zooplankton aggregations

Event Type: 
CTR Tea
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: 
CTR Tea
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.

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