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CTR Tea

Detailed modeling of radiative heat transfer in combustion systems

Event Type: 
CTR Tea
Date and Time: 
Friday, October 20, 2017 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Xinyu Zhao
Abstract: 

Radiative heat transfer process in combustion systems has received relatively little attention to date. Recently, it starts to generate increasing interest given the current trends of engine designs for both internal combustion engines and aeronautical engines.

Modeling velocity gradients along particle trajectories in turbulence

Event Type: 
CTR Tea
Date and Time: 
Friday, September 29, 2017 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Perry Johnson
Abstract: 

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.

Transition to turbulence in wall-bounded shear Flows

Event Type: 
CTR Tea
Date and Time: 
Friday, September 22, 2017 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Michael Karp
Abstract: 

In this talk several aspects of transition to turbulence in wall-bounded shear flows are addressed. One aspect discusses the formation and evolution of coherent structures, such as counter-rotating vortex pairs (CVPs) and hairpins, observed in various transitional as well as turbulent flows.

Energy Stable Boundary Conditions for the Nonlinear Incompressible Navier-Stokes Equations

Event Type: 
CTR Tea
Date and Time: 
Friday, September 1, 2017 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Jan Nordström
Abstract: 

We derive boundary conditions for the nonlinear incompressible Navier-Stokes equations following the general recipie given in [1]. We present two formulations stemming from different techniques to diagonalize the boundary terms. Both formulations lead to an energy estimate.

Smoothed Profile Method for Modeling Particulate Flows

Event Type: 
CTR Tea
Date and Time: 
Friday, August 25, 2017 - 4:30pm
Location: 
CTR Conference Room 103
Speaker(s): 
Fazlolah Mohaghegh (Ehsan)
Abstract: 

This study shows recent developments in the Smoothed Profile Method (SPM) as a diffuse-interface approach. SPM is well suited towards simulating the dynamics of dense particulate flows at the meso-scale, i.e. when particles are resolved.

Model-based and data-based flow analysis using optimization

Event Type: 
CTR Tea
Date and Time: 
Friday, August 18, 2017 - 4:15pm
Location: 
Yang & Yamazaki Environment & Energy Building (Y2E2), Room 111, 473 Via Ortega (Science and Engineering Quad, near the corner of Via Ortega and Panama Street)
Speaker(s): 
Professor Peter Schmid
Abstract: 
In recent years, PDE-constrained optimization has become an effective and efficient tool in the analysis of complex fluid systems.

A multifractal formulation of the momentum cascade in wall-bounded turbulence

Event Type: 
CTR Tea
Date and Time: 
Friday, August 4, 2017 - 4:15pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Xiang I. A. Yang
Abstract: 

The cascading process of turbulent kinetic energy from large-scale fluid motions to small-scale and lesser-scale fluid motions in isotropic turbulence may be modeled as a hierarchical random multiplicative process according to the multifractal formalism.

Characterization of buoyancy-driven turbulent flows over inclines 

Event Type: 
CTR Tea
Date and Time: 
Friday, July 21, 2017 - 4:15pm
Location: 
CTR Conference Room 103
Speaker(s): 
Dr. Marco Giometto, Postdoctoral Fellow, Center for Turbulence Research, Stanford University
Abstract: 

Buoyancy driven turbulent flows over inclines will be considered within the conceptual framework of the Prandtl slope-flow model. Such flows are ubiquitous in engineering and the environment, but despite decades of active research, they remain a poorly understood problem.

Observation of laminar to turbulent transition in an already turbulent flow

Event Type: 
CTR Tea
Date and Time: 
Friday, July 7, 2017 - 4:15pm
Location: 
CTR Conference Room 103
Speaker(s): 
Professor Shuisheng He, Department of Mechanical Engineering, University of Sheffield, United Kingdom
Abstract: 

Professor He will present a new perspective of transient turbulent flow and show that in such flows, turbulence does not progressively evolve from one state to another. Instead, the flow is characterised by the development of a laminar boundary layer followed by transition to turbulence.

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