SUNMONTUEWEDTHUFRISAT
Conferences, Lectures, & Seminars
Events for January
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Aerospace and Mechanical Engineering Seminar Series
Wed, Jan 13, 2016 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Stefan Llewellyn Smith, Professor in the Department of Mechanical and Aerospace Engineering at the University of California, San Diego
Talk Title: Hollow Vortices
Series: Aerospace and Mechanical Engineering Seminar Series
Abstract: Hollow vortices are vortices whose interior is at rest. They posses vortex sheets on their boundaries and can be viewed as a desingularization of point vortices. After giving a history of point vortices, we obtain exact solutions for hollow vortices in linear and nonlinear strain and examine the properties of streets of hollow vortices. The former can be viewed as a canonical example of a hollow vortex in an arbitrary flow, and its stability properties depend on a single non-dimensional parameter. In the latter case, we reexamine the hollow vortex street of Baker, Saffman and Sheffield and examine its stability to arbitrary disturbances, and then investigate the double hollow vortex street. Implications and extensions of this work are discussed.
Biography: Stefan G. Llewellyn Smith received his Ph.D. in applied mathematics from the University of Cambridge in 1996. He was a research fellow of Queens' College, Cambridge, from 1996 to 1999, working in the Department of Applied Mathematics and Theoretical Physics. He spent a year from 1996 to 1997 on a Lindemann Trust Fellowship at the Scripps Institution of Oceanography in La Jolla. He joined the Department of Mechanical and Aerospace Engineering at UCSD in 1999 as Assistant Professor of Environmental Engineering. His research interests include fluid dynamics, especially its application to environmental and engineering problem, acoustics and asymptotic methods.
Location: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: Valerie Childress
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Aerospace and Mechanical Engineering Seminar Series
Wed, Jan 20, 2016 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Assad Oberai, Professor in the Department of Mechanical, Aerospace and Nuclear Engineering at the Rensselaer Polytechnic Institute
Talk Title: Biomechanical Imaging: Shall We See How You Feel?
Series: Aerospace and Mechanical Engineering Seminar Series
Abstract: Certain types of diseases lead to changes in the microstructural organization of tissue. Altered microstructure in turn leads to altered macroscopic tissue properties, which are often easier to image than the microstructure itself. Thus the measurement of macroscopic properties offers a window into tissue microstructure and health. In Biomechanical Imaging (BMI) we aim to utilize this association between the macroscopic mechanical properties of tissue and its health by generating images of the mechanical properties and using these to infer tissue microstructure and health.
At the heart of BMI lies the solution of an inverse problem in continuum mechanics: given the deformation of the medium (tissue) and a constitutive model, determine the spatial distribution of the material properties. In this talk, I will discuss the well-posedness of this inverse problem and describe efficient and robust algorithms for solving it. I will also describe the development of new constitutive models that are motivated by tissue microstructure, and applications of BMI that include improved in-vivo diagnosis of breast cancer, and imaging elastic properties of tissue at the cellular, and sub-cellular levels.
Biography: Assad Oberai is a Professor in the Department of Mechanical Aerospace and Nuclear Engineering at Rensselaer Polytechnic Institute (RPI). He is also the Associate Dean for Research and Graduate Studies in the School of Engineering, and the Associate Director of the Scientific Computation Research Center (SCOREC). Assad is a recipient of the National Science Foundation Career award in 2005 and the Department of Energy Early Career award in 2004. He was awarded the Thomas J.R. Hughes Young Investigator Award by the American Society of Mechanical Engineers in 2007. He received the Humboldt Foundation Award for experienced researchers in 2009, and the Erasmus Mundus Master Course Lectureship at Universidad Politécnica de Cataluña, Barcelona in 2010. In 2015, he was awarded the Research Excellence Award by the School of Engineering at RPI, and was elected as a Fellow of the United States Association of Computational Mechanics (USACM). In 2016, he was elected as a Fellow of the American Institute of Medical and Biological Engineering (AIMBE). He is on the board of academic editors for the journal PlosOne.
Host: Prof. Roger Ghanem
Location: Seaver Science Library (SSL) - Biomechanical Imaging: Shall We See How You Feel?
Audiences: Everyone Is Invited
Contact: Valerie Childress
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor. -
Aerospace and Mechanical Engineering Seminar Series
Wed, Jan 27, 2016 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: John Vassberg, Chief Aerodynamicist of Boeing Research and Technology, Long Beach, CA
Talk Title: Boomerang Flight Dynamics
Series: Aerospace and Mechanical Engineering Seminar Series
Abstract: Aerodynamic characteristics and flight dynamics of boomerangs are investigated. A basic aerodynamic model, developed in the 1960's, is expanded upon using Blade Element Theory. The new aerodynamic model is coupled with a gyroscope model for rudimentary analyses. Some significant findings are made regarding the radius of a boomerang's circular flight path, the required inclination angle of its axis-of-rotation, its trim state, as well as its dynamic stability. These discoveries provide a basic understanding of how the interplay between aero-dynamic forces and moments, and gyroscopic precession combine to return the boomerang to its rightful owner by way of a circular flight path.
A traditional V-shaped boomerang design is developed as a case study for further detailed analyses. Unsteady Reynolds-averaged Navier-Stokes solutions provide accurate aerodynamic characteristics of the subject boomerang. The high-fidelity aerodynamic model is coupled with the equations of motion to provide accurate six-degree-of-freedom simulations of boomerang flight dynamics. Boomerang orientation during its flight trajectory is described by the classical Euler angles.
Biography: Dr. John Vassberg is the Lead Aerodynamicist and Engineer of the Boeing Commercial Airlines Design Center in Southern California. Prior to this, he was Chief Aerodynamicist of Boeing's Research & Technology organization. He is a Boeing Technical Fellow, an AIAA Fellow, and recipient of the AIAA Aerodynamics Award in 2012. Dr. Vassberg actively supports various Boeing Commercial Airlines, Boeing Defense Systems, and Boeing Research and Technology airplane design programs. During his 32-year career at Boeing, Dr. Vassberg has developed, matured, transitioned, and applied numerous computational fluid dynamics (CFD) methods and aerodynamic technologies. In order to accomplish this, he has worked about half of his career in aerodynamic research and technology groups and the other half in aircraft program development organizations. Dr. Vassberg holds over a dozen Patents related to aerodynamic technologies, and has authored over 100 publications. In addition, Dr. Vassberg has introduced and developed new fields of numerical simulation including: in-flight refueling hose-drogue dynamics, towed-decoy dynamics, fast surface-paneling techniques, and globally-elliptic meshing methods.
Location: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: Valerie Childress
This event is open to all eligible individuals. USC Viterbi operates all of its activities consistent with the University's Notice of Non-Discrimination. Eligibility is not determined based on race, sex, ethnicity, sexual orientation, or any other prohibited factor.
