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Keynote and Invited Speakers |
Invited
Speaker Presentations
Keynote Speaker:
Anthony
R. Ingraffea
Dr. Ingraffea's research concentrates on computer
simulation and physical testing of complex fracturing processes. He and his
students performed pioneering research in the use of interactive computer graphics
in computational mechanics. He has authored with his students over 180 papers
in these areas.
He has been a principal investigator on R&D projects from the NSF, NASA Langley, NASA Marshall, AFOSR, FAA, Kodak, U. S. Army Engineer Waterways Experiment Station, U.S. Dept. of Transportation, IBM, Schlumberger, Digital Equipment Corporation, the Gas Research Institute, Sandia National Laboratories, the Association of Iron and Steel Engineers, General Dynamics, Boeing, Caterpillar Tractor, and Northrop Grumman Aerospace. He has been a principal or co-principal investigator on over $27M in externally funded R&D since arriving at Cornell in 1977.
Professor Ingraffea was a member of the first group of Presidential Young Investigators named by the National Science Foundation in 1984. For his research achievements he has won the International Association for Computer Methods and Advances in Geomechanics "1994 Significant Paper Award" for one of five most significant papers in the category of Computational/Analytical Applications in the past 20 years, and he has twice won the National Research Council/U.S. National Committee for Rock Mechanics Award for Research in Rock Mechanics (1978, 1991). His group won a NASA Group Achievement Award in 1996, and a NASA Aviation Safety Turning Goals into Reality Award in 1999 for its work on the aging aircraft problem. He became a Fellow of the American Society of Civil Engineers in 1991.
Professor Ingraffea has
received numerous awards his outstanding teaching at Cornell. He has been a
leader in the use of workstations and information technology in engineering
education, with grants from the NSF, U.S. Department of Education, Digital Equipment
Corporation, Sun Microsystems, and Hewlett-Packard in these areas. He organized
and was the first Director of the NSF-supported Synthesis National Engineering
Education Coalition, a team of eight diverse engineering colleges. Synthesis
developed, implemented, and assessed innovative programs and technologies to
improve the quality of undergraduate engineering education and to attract and
graduate larger numbers of women and under-represented minority engineers.
Abstract:
Meshing for Crack Propagation Problems:
Problems from Within and Without
Crack propagation is an evolutionary geometry problem. To simulate the arbitrary growth of 3D cracks with the finite element method requires many incremental geometry and corresponding mesh changes. The nature of crack front fields, and the complex geometries that can evolve also put special demands on meshing. I will focus my talk on two things:
Herbert Edelsbrunner
Arts and Sciences
Professor
Computer Science and Mathematics
Duke University
Fields of Research
· data structures and algorithms
· discrete and computational geometry
· geometric modeling
· mesh generation
· computational topology
· computational structural biology
Abstract:
Dynamic Surface Meshing
The topic of this
talk is the maintenance of a triangulation describing a surface that deforms
in time. This is a fairly complicated task, and the goal we set for ourselves
is to see to what extent we could design the algorithm so that the result is
predictable and its correctness is provable. We made a number of design decisions
limiting our choice of surface, motion, and triangulation. The final algorithm
maintains the mesh using three types of operations:
Besides presenting the
set-up, we will focus on the Type B operations and discuss a relaxed scheduling
paradigm that is based on time bounds during which we are guarantee that edges
and triangles satisfy all necessary constraints.
Hugues Hoppe
Hugues Hoppe is a researcher in the Computer Graphics Group at Microsoft Research.
His primary interests lie in the acquisition, representation, and rendering
of geometric models. For his PhD work on surface reconstruction from 3D scans,
he was selected as a finalist in the 1995 Discover Awards for Technological
Innovation. He subsequently developed multiresolution representations for geometry,
including piecewise smooth subdivision surfaces, progressive meshes, progressive
simplicial complexes, displaced subdivision surfaces, and geometry images. Most
recently, his research efforts have focused on surface parameterizations, in
order to exploit the powerful rasterization features of evolving graphics hardware.
Contributions include lapped textures, normal-shooting parameterization, stretch-minimizing
parameterizations, and hierarchical parameterization solvers. His publications
include 15 papers at ACM SIGGRAPH. He received a BS summa cum laude in electrical
engineering in 1989 from the University of Washington, and a PhD in computer
science from the University of Washington in 1994.
Abstract:
Irregular to Completely
Regular Meshing in Computer Graphics
This talk will provide a quick overview of meshing structures used in computer
graphics. Maximizing rendering performance is a key goal, and irregular meshes
provide the greatest geometric fidelity for a given mesh complexity. Level-of-detail
representations like progressive meshes allow selective refinement of such meshes
even in real-time applications. Semi-regular meshes, defined using a mesh subdivision
process, offer simpler data structures, and can converge to smooth limit surfaces.
Finally, geometry images describe an arbitrary surface using completely regular
remeshing, thus storing only a 2D array of points. The simplicity of such geometry
images is ideally suited for implementation in graphics hardware.
Dimitri Mavriplis
Dimitri Mavriplis has been working in the area of unstructured grid computational
fluid dynamics for over 15 years. In this time he has developed three-dimensional
parallel unstructured multigrid solution algorithms for computing high-Reynolds
number flows
over aerodynamic configurations. He has also been involved in the development
of unstructured grid generation and adaptation techniques for aerodynamic problems.
He has developed a suite of CFD codes which are used within NASA and in industry.
He is currently a Research Fellow at ICASE, a non-profit research Institute
located at NASA Langley in Hampton, VA. He obtained his PhD in Mechanical and
Aerospace Engineering from Princeton University, and his Master's and Bachelor's
Degrees in Mechanical Engineering from McGill University, in Montreal Canada.
Abstract:
Unstructured Mesh Related Issues
in Computational Fluid Dynamics (CFD) - Based Analysis and Design
The use of unstructured meshes
for computational fluid dynamics problems has gained widespread acceptance over
the last decade with the emergence of fast and robust grid generation packages
and the continuous improvement of CFD flow solvers.
This talk will look beyond the step of initial mesh generation for CFD analysis
problems, towards other mesh related issues which are involved in current and
future large-scale simulations based on parallel computing architectures. These
include techniques such as adaptive meshing and dynamic load balancing, as well
as fast parallel unstructured multigrid solvers. Examples of implementations
of these methods and their use in parallel steady-state applications will be
given. For unsteady flow simulations, techniques for moving meshes as well as
overlapping unstructured meshes will be discussed and their implications for
parallel computing will be addressed. Additional mesh related issues which arise
in the context of design optimization problems, such as the requirement to obtain
grid sensitivities with respect to design variables will also be discussed.
Finally, the use of higher order methods (higher than order 2) in CFD could
dramatically affect the requirements of future mesh generation schemes, and
the implications of this trend will be examined.
Welcome
Address Speaker:
Robert
C. Richardson, Nobel Prize Winner in Physics 1996, Vice Provost for Research
at Cornell
Banquet
Speaker:
Joe F. Thompson,
Distinguished Professor of Aerospace Engineering, Mississippi State University