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CTR events

CTR Tea : Friday, April 24, 2015 - 4:00pm : Speaker(s): Dr. Anthony Wachs, Fluid Mechanics Department,IFP Energies nouvelles, Solaize, France
Abtract:

Particulate flows are ubiquitous in environmental, geophysical and engineering processes. The intricate dynamics of these two-phase flows is governed by the momentum transfer between the continuous fluid phase and the dispersed particulate phase. When significant temperature differences exist between the fluid and particles and/or chemical reactions take place at the fluid/particle interfaces, the phases also exchange heat and/or mass, respectively. While some multi-phase processes may be successfully modelled at the continuum scale through closure approximations, an increasing number of ap... Read More

Bio:
Dr Anthony Wachs received BS & MS degrees from University Louis Pasteur, Strasbourg and his PhD from the Institut National Polytechnique of Grenoble in 2000. He joined Institut Français du... Read More
CTR Tea : Friday, April 17, 2015 - 4:00pm : Speaker(s): Mohammad Mehrabadi, Mechanical Engineering, Iowa State University, Ames, IA
Abtract:

Gas-solid flows are encountered in many industrial processes such as pneumatic conveying, fluid catalytic cracking, CO2 capturing and fast pyrolysis process. In spite of all experimental and numerical studies performed to understand the physics governing observed phenomena in gas-solid flows, and propose accurate closure models for computational fluid dynamics (CFD) simulations using the averaged conservation equations, there are several challenges in gas-solid flows that yet need to be addressed. In many of the industrial processes, the solid-to-fluid density ratio is of the order of 100 t... Read More

Bio:
Mohammad Mehrabadi is a PhD candidate in Mechanical Engineering at Iowa State University. Before attending the Iowa State, he received his Master’s degree at University of Tehran, Iran in 2006 with... Read More
CTR Tea : Friday, February 20, 2015 - 4:00pm : Speaker(s): Dr. Lluis Jofre-Cruanyes, Postdoctoral Fellow, Center for Turbulence Research
Abtract:

The present talk tries to summarize the work performed by Lluis Jofre-Cruanyes during his PhD.The research aims at developing a basis for the numerical simulation of multiphase flows of immiscible fluids. The formulation is based on a finite-volume approach and is suitable for three-dimensional (3-D) unstructured meshes, as well for Cartesian grids. The software implemented is part of an in-house high performance computing platform able to simulate multiphysics problems. This platform is based on object-oriented programming, using C++ language, and parallelization is accomplished via... Read More

Bio:
Dr. Lluis Jofre-Cruanyes is a new postdoctoral fellow athe Center for Turbulence Research (CTR). He is interested in numerical methods for computational fluid dynamics and multiphysics. His research... Read More
CTR Tea : Friday, February 6, 2015 - 4:00pm : Speaker(s): Professor Jenny Suckale, Geophysics Department, Stanford University
Abtract:

The role of coastal forests in the mitigation of tsunami disasters has become a hotly debated topic in the aftermath of the devastating tsunami in the Indian Ocean in 2004 and Japan in 2011. Unfortunately, our knowledge of the interactions between tsunamis and vegetation is limited and the associated danger of ineffective or even potentially harmful policies is concerning. Through this project, we hope to contribute to bridging the gap between science and policy and provide new insights on whether and how coastal trees or forests may be promising for protective purposes. Since our res... Read More

Bio:
Dr. Jenny Suckale is an Assistant Professor in the Department of Geophysics at Stanford University. She is also an affiliated faculty member of Stanford’s Institute for Computational and Mathematical... Read More
CTR Tea : Friday, January 23, 2015 - 4:00pm : Speaker(s): Dr. Philipp Hack, Imperial College, London
Abtract:

Linear stability analysis is applied to pre-transitional boundary layer flow fields extracted from direct numerical simulations (DNS) of bypass transition (Hack & Zaki, J. Fluid Mech., 2014a). The presence of broadband free-stream forcing in the DNS leads to the formation of a spectrum of high-amplitude streaks inside the boundary layer. The streaky base flow becomes susceptible to high-frequency modal instabilities which are localized on single streaks and which eventually induce breakdown to turbulence. It is shown that linear stability theory can capture the attributes of the instabi... Read More

CTR Tea : Friday, January 9, 2015 - 4:00pm : Speaker(s): Dr. Babak Hejazi, Cascade Technologies
Abtract:

Linear stability analysis is applied to pre-transitional boundary layer flow fields extracted from direct numerical simulations (DNS) of bypass transition (Hack & Zaki, J. Fluid Mech., 2014a). The presence of broadband free-stream forcing in the DNS leads to the formation of a spectrum of high-amplitude streaks inside the boundary layer. The streaky base flow becomes susceptible to high-frequency modal instabilities which are localized on single streaks and which eventually induce breakdown to turbulence. It is shown that linear stability theory can capture the attributes of the instabi... Read More

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