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CTR Tea : Tuesday, August 6, 2019 - 4:30pm : Speaker(s): Professor Sivaramakrishnan Balachandar
Abtract:

No Abstract.

Bio:
http://www.mae.ufl.edu/people/balachandar
CTR Tea : Friday, August 2, 2019 - 4:30pm : Speaker(s): Professor William R. Wolf
Abtract:

Unsteady flows over plunging and pitching airfoils with large excursions in effective angle of attack exhibit the phenomenon of dynamic stall. This process is characterized by unsteady separation and formation of a large leading-edge vortex that exerts high amplitude fluctuations in aerodynamic loads. Although several studies have been conducted for pitching airfoils at high Reynolds numbers, research on dynamic stall for plunging airfoils is more scarce, especially at low and moderate Reynolds numbers.

We employ large eddy simulations to study the flow physics of deep dynamic stall... Read More

Bio:
William R. Wolf is the founder and PI of the Laboratory of Aeronautical Sciences in the School of Mechanical Engineering at University of Campinas, Brazil. He received his BSc in Mechanical... Read More
CTR Tea : Tuesday, June 11, 2019 - 4:30pm : Speaker(s): Dr. Kazuki Maeda
Abtract:

Cavitation and bubble dynamics are of critical importance in various industrial systems. In ultrasound therapy, cloud cavitation that is nucleated in the human body is crucial for treatment outcomes; bubble clouds can coherently collapse to cause injury as well as scatter the wave energy to shield therapy targets. In this talk, I will present a method for multi-scale modeling and simulation of intense cloud cavitation in a compressible liquid, and its application for medical ultrasound. The method employs an Eulerian-Lagrangian approach to solve mixture- averaged equations of motion, in tha... Read More

Bio:
Dr. Kazuki Maeda is an Acting Assistant Professor of Mechanical Engineering at the University of Washington. He received his BS degree in Mechanical Engineering from the University of Tokyo in 2013,... Read More
CTR Tea : Friday, May 24, 2019 - 4:30pm : Speaker(s): Mr. Angxiu Ni
Abtract:

Turbulence is an important example of chaotic dynamical systems, and sensitivity analysis is a powerful tool for design via computation.  However, traditional sensitivity methods explode for chaotic systems, posing the challenge we will address in this talk.  We first review how to compute meaningful derivatives of long-time-averaged objectives in chaotic systems via the shadowing method, which we then reformulate as a 'non-intrusive' minimization problem on the unstable subspace. Then we show a recent adjoint shadowing theorem, based on which we develop an adjoint sensitivity algorithm, NI... Read More

Bio:
Mr. Angxiu Ni (pronounces as ang-shyou-knee) got his BS in Mechanical Engineering from Tsinghua University. He then got two MS, one at Tsinghua University working with Professor Haixin Chen, one at... Read More
CTR Tea : Friday, May 3, 2019 - 4:30pm : Speaker(s): Mr. Seyedshahabaddin (Shahab) Mirjalili
Abtract:

From oceanic breaking waves to atomization of liquid fuels for combustion, two-phase flows are omni-present in natural and industrial settings. Despite decades of numerical method development, due to the many challenges involved in simulation of realistic two-phase flows, no gold-standard has yet emerged in the literature. In this study, we present a novel diffuse interface method that addresses various challenges for simulation of incompressible, immiscible two-phase flows. The boundedness of this mass-conserving interface-capturing method is proven analytically. Then, a comparison of the... Read More

Bio:
Shahab Mirjalili defended his PhD in Mechanical Engineering at Stanford University in March 2019. During his PhD under the supervision of Professor Ali Mani, he focused on development of numerical... Read More
CTR Tea : Friday, April 26, 2019 - 4:30pm : Speaker(s): ICME / CTR Visiting Associate Professor Qiqi Wang
Abtract:

What is the future of computing? Some believe it's big data. For others, it's big computation. Supporters of big data believe that most problems can be solved by gathering huge amounts of data and applying machine learning. Those who believe in big computation, however, postulates that all phenomena in the world can be explained by solving simple physical equations with sufficient computational power. Who is right? In this talk, I will give my personal view on this question.

Bio:
Qiqi Wang (pronounces as Chi-chi Wong) got his BS in mathematics from University of Science and Technology at Hefei, China. He then got his Ph.D. in Computational and Mathematical Engineering at... Read More
CTR Tea : Friday, April 5, 2019 - 4:30pm : Speaker(s): Dr.-Ing. Lin Fu
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Shock-wave/boundary-layer interactions are typical flow phenomena in hypersonic flows. In this study, large-scale DNS and equilibrium wall-modeled LES (WMLES) are employed to investigate and predict the physical processes responsible for the intense overheating downstream from the shock-impingement region, where the boundary layer suddenly transitions to turbulence.  (1) At low shock incidence angles, the post-shock transition strongly depends on the inlet disturbances, e.g. the amplitude and the random phase. WMLES has difficulties to replicate the DNS statistics due to the fact that coars... Read More

Bio:
Dr.-Ing. Lin Fu is a Postdoctoral Fellow of CTR at Stanford University since January 2018. He is now working on hypersonic flows in Prof. Moin’s group. Before he joined CTR, he obtained his Ph.D.... Read More
CTR Tea : Friday, March 15, 2019 - 4:30pm : Speaker(s): Dr. Quentin Douasbin
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Combustion devices are prone to combustion instabilities (CIs). They classically occur when heat release rate oscillations and acoustic fluctuations become coherent, creating constructive interferences. To predict the occurrence of CIs in combustion devices, one must account for 1) the acoustic waves in the entire combustion system and 2) the flame response to these fluctuations. The former can only be obtained if the acoustic properties of the boundaries are properly prescribed. During this seminar, a Time Domain Impedance Boundary Condition (TDIBC) method will be presented as well as a mo... Read More

Bio:
Before joining the CTR, Dr. Quentin Douasbin was a Postdoctoral Fellow at CERFACS, Toulouse, France, where he worked on the development of CFD software for industrial partners. He received his Ph.D.... Read More
CTR Tea : Friday, March 1, 2019 - 4:30pm : Speaker(s): Dr. Mario Di Renzo
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The impingement of electric fields on flames is known to have potential for mitigating combustion instabilities, enhancing flame propagation, and decreasing pollutant emissions. In particular, electric fields can be used to steer ions produced inside the flame in opposite directions depending on their sign. These ions collide and exchange momentum with the surrounding neutral molecules, which leads to modifications in the flow field. In this talk, steady axisymmetric numerical simulations of methane/air counterflow laminar diffusion flames are employed in order to analyze the effects of the... Read More

Bio:
Before joining the CTR as a Postdoctoral fellow, Dr. Di Renzo was a researcher at Politecnico di Bari, Italy, where he received his BS and MS in Mechanical Engineering as well as his Ph.D. under the... Read More
CTR Tea : Friday, February 15, 2019 - 4:30pm : Speaker(s): Dr. Adrián Lozano-Durán
Abtract:

Turbulent flows in the presence of bounding surfaces, as those occurring in oceanic and atmospheric currents, around vehicles, or inside pipes, may be apprehended as a collection of whirls or eddies. These eddies follow a regeneration cycle, i.e, existing eddies are seeds for the origin of new ones and so forth.  Understanding this process is critical for the modeling and control of geophysical and industrial flows where a non-negligible fraction of the energy is dissipated by turbulence in the immediate vicinity of walls. In the present work, we examine the causal interactions among energy... Read More

Bio:
Dr. Adrian Lozano-Duran received his PhD from the Technical University of Madrid in 2015 at the Computational Fluid Mechanics Lab. headed by Prof. Jiménez. His main research has focused on... Read More

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