Keynote and Invited Speakers
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.
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:
Arts and Sciences Professor
Computer Science and Mathematics
Fields of Research
· data structures and algorithms
· discrete and computational geometry
· geometric modeling
· mesh generation
· computational topology
· computational structural biology
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 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.
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 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.
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.
Robert C. Richardson, Nobel Prize Winner in Physics 1996, Vice Provost for Research at Cornell
Joe F. Thompson, Distinguished Professor of Aerospace Engineering, Mississippi State University