Conferences, Lectures, & Seminars
Events for April
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AME Department Seminar
Wed, Apr 06, 2011 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Dr. Veronica Eliasson, Assistant Professor, Department of Aerospace & Mechanical Engineering
Talk Title: Shock Wave Adventures
Abstract: A shock wave is a useful tool to generate very high pressures and temperatures. In particular, the energy from a shock wave can be focused and then generate even more extreme conditions. Applications on shock wave focusing range from medical treatment of kidney stones to supernovae collapse, and in this talk I will present some of the projects my group is working on. In particular we are interested in impact events where a strong fluid-structure coupling is present and has to be taken into account. In particular, we are interested in shock focusing in water and material effects with applications to marine structures, understanding the cause and how to prevent traumatic brain injury caused by blast waves, and effects of cavitation due to pulses propagating through fluid-filled cracks.
More Info: http://ame-www.usc.edu/seminars/index.shtml#upcomingLocation: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: April Mundy
Event Link: http://ame-www.usc.edu/seminars/index.shtml#upcoming
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AME Department Seminar
Wed, Apr 13, 2011 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Eva Kanso, Associate Professor, Department of Aerospace & Mechanical Engineering, University of Southern California
Talk Title: Research Progress of the USC Nonlinear Dynamics Group
Abstract: I present some of the recent research activities at the USC Nonlinear Dynamics Group. In particular, I highlight the work of Fangxu Jing (PhD'11), Babak Oskouei (PhD'11) and Adam Ysasi (MS'10). The underlying theme is fluid-body coupling and the locomotion of aquatic animals. Much attention has been given recently to understanding how aquatic animals use fluid-body coupling to their advantage, thus achieving impressive maneuvers and hydrodynamic efficiencies. The approach of our research group is to investigate basic mechanisms by which idealized bodies swim in a perfect fluid. I discuss two types of locomotion: (i) active locomotion due to controlled body deformations, and (ii) passive locomotion due to energy harvested from ambient vorticity. I comment on the stability of motion in unsteady flows and conclude with the ongoing work of Andrew Tchieu (post-doc) on the finite dipole dynamical system as a model for fish schooling.
Host: Prof. E. Kanso
More Info: http://ame-www.usc.edu/seminars/index.shtml#upcomingLocation: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: April Mundy
Event Link: http://ame-www.usc.edu/seminars/index.shtml#upcoming
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AME Department Seminar
Wed, Apr 20, 2011 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Sandro Gomez , Professor, Yale University
Talk Title: Highly Turbulent Strained Premixed Flames in the Distributed Reaction Regime
Abstract: Turbulent lean-to-stoichiometric premixed flames were experimentally studied in a counterflow configuration at turbulent Reynolds numbers on the order of one thousand. The primary objective is to examine conditions of departure from the flamelet regime and analyze the turbulent premixed flame structure under conditions in which disrupted and locally-extinguished flame fronts are expected.
A turbulent stream of fresh premixed reactants was opposed to a second stream of hot products of combustion. By varying temperature and composition of the combustion product stream, the ârealitiesâ of practical flames, such as heat losses and composition stratification, could be studied systematically in a well-defined system. These effects are not accounted for by the commonly used Borghi diagram of regimes of turbulent premixed combustion. Diagnostic techniques included PIV and simultaneous CO/OH-LIF to probe the structure of the oxidation layer.
It was found that the boundary between the flamelet regime and the distributed reaction zone was lowered significantly to turbulent Karlovitz numbers, Kat, of unity order. The oxidation layer was found to be sensitive to the turbulence intensity and the hot product composition. In fact, the quenching of the oxidation layer, that is not currently accounted for in turbulent combustion models, appeared to be a critical element of departure from the flamelet regime.
The interpretation of the experimental results was aided by ancillary numerical calculations of strained laminar premixed flames that showed two distinct extinction modes, an abrupt one and a smooth one, the latter being favored by an excess of oxidizing species in the combustion product stream.
The highly turbulent opposed jet system is shown to offer several advantages by comparison with the more common jet flames and is proposed as a benchmark for turbulent combustion studies.
Host: Prof. P. Ronney
More Info: http://ame-www.usc.edu/seminars/index.shtml#upcomingLocation: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: April Mundy
Event Link: http://ame-www.usc.edu/seminars/index.shtml#upcoming
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AME Department Seminar
Wed, Apr 27, 2011 @ 03:30 PM - 04:30 PM
Aerospace and Mechanical Engineering
Conferences, Lectures, & Seminars
Speaker: Bill Henshaw, Centre for Applied Scientific Computing, Lawrence Livermore National Laboratory
Talk Title: Deforming Composite Grids for Fluid Structure Interactions
Abstract: For some years we have been developing an open source software framework called Overture for the solution of partial differential equations in complex moving geometry. We use overlapping grids (also know as overset or Chimera grids) to efficiently represent complex geometry with structured grids. I will begin this talk by giving a brief overview of Overture and its capabilities. The focus of the talk will be on our recent work for fluid structure interaction problems. I will describe the use of deforming composite overlapping grids for the solution of problems coupling fluid flow and deforming solids. The method is based on a mixed Eulerian Lagrangian technique. Local moving boundary-fitted grids are used near the deforming interface and these overlap non-moving grids which cover the majority of the domain. The approach is described and validated for some fluid structure problems involving high speed compressible flow and linear elastic solids.
Host: Prof. V. Eliasson
More Info: http://ame-www.usc.edu/seminars/index.shtml#upcomingLocation: Seaver Science Library (SSL) - 150
Audiences: Everyone Is Invited
Contact: April Mundy
Event Link: http://ame-www.usc.edu/seminars/index.shtml#upcoming