Mark Shephard, Rensselaer Polytechnic Institute
Biography: Mark S. Shephard is the Samuel A. and Elisabeth C. Johnson, Jr. Professor of Engineering, and the director of the Scientific Computation Research Center at Rensselaer Polytechnic Institute. He holds joint appointments in the departments of Mechanical, Aerospace and Nuclear Engineering; Civil and Environmental Engineering; and Computer Science. Dr. Shephard has published over 250 papers. He is a fellow in and the past President of the US Association for Computational Mechanics, a fellow and member of the General Council of the International Association for Computational Mechanics, a fellow of ASME and an Associate Fellow of AIAA. He is the editor of Engineering with Computers and on the editorial board of six computational mechanics journals. He is a co-founder of Simmetrix Inc., a company dedicated to the technologies that enable simulation-based engineering.
Abstract: Mesh Control in the Adaptive Simulation of Cardiovascular Flows
Mark S. Shephard, Onkar Sahni and Kenneth E. Jansen
Scientific Computation Research Center, Rensselaer Polytechnic Institute
In recent years, the relationship between hemodynamic factors and arterial diseases has attracted careful evaluation of arterial blood flow and wall shear stress patterns. A central goal of these efforts is to support the ability to obtain patient-specific anatomic and physiological information from imaging techniques and to perform accurate blood flow simulations to predict the effectiveness of alternative surgical procedures. Stanford, Rensselaer and Simmetrix have been working to provide the tools needed to support these activities (https://simtk.org/home/simvascular). This presentation will focus on the development and application of the adaptive mesh control procedures developed to support the adaptive simulation of meshes with millions of elements solved on massively parallel computers. These adaptive procedure starts with an initial boundary layer mesh and adapt it to match the anisotropic mesh size field defined by directional correction indicators. The local mesh modification operations, are performed such that the structure of the boundary layer mesh is maintained. The results to be presented will demonstrate the importance of properly adapted meshes to effectively determine critical factors such as wall shear stresses and the location of recirculation regions that can arise during the cardiac cycle at diseased locations in the arteries. The results will also show that even with well-controlled adapted meshes, it is necessary to employ meshes of 10’s of millions of elements.
Doug received a Ph.D. in Physics from Stanford University in 1975. He led the Tokamak Modeling Group at the Princeton University Plasma Physics Laboratory from 1975 to 1993 and served as head of International Thermonuclear Experimental Reactor (ITER) Physics Project Unit (1988-1990), and head of ITER Joint Central Team In-vessel Physics Group (1993-1998). More recently, he was the A-X Associate Division Leader for Simulation at Lawrence Livermore National Laboratory (1998-2000) and the Deputy X-Division Leader for Simulation at the Los Alamos National Laboratory (2001-2003). He has published over 125 refereed papers, 100 conference papers and 10 book chapters on computational, experimental and theoretical physics with over 5200 citations. He is a Fellow of the American Physical Society, the American Nuclear Society, and the Institute of Electrical and Electronic Engineers.
Abstract: A New DoD Initiative: The Computational Research and Engineering Acquisition Tools and Environments (CREATE) Program
The Department of Defense is launching a new initiative: The Computational Research and Engineering Acquisition Tools and Environments (CREATE) Program. CREATE is a 12 year program to develop and deploy three sets of computational engineering tools for aircraft and ship design and for the design and integration of RF antennas with platforms. The customers for the CREATE tools are the DoD acquisition program engineers, both government and industry. Each project will include about 35 full time staff from the DoD community (DoD Labs, industry, academia and other federal agencies). The three major projects will be supported by a computational infrastructure group. While the funding will begin in FY08, planning has already started.
The CREATE goal is to improve the acquisition process by providing tools to acquisition program engineers for use early in the acquisition process, e.g., during concept development and analysis of alternatives before major cost and schedule decisions are made. CREATE tools will be used to detect and fix design defects before major schedule and budget commitments have been made. CREATE tools will also shorten the time required for design, system integration and testing, thus increasing the flexibility of DoD acquisition programs to adjust to rapid changes in requirements. The CREATE program has similar goals and challenges to the Sandia computational engineering program, and an exchange of views and experiences could be valuable for both communities.
Mesh and grid generation is a key issue for the success of CREATE. If engineers must spend months generating meshes before they can apply high fidelity engineering analysis tools, rapid design development and exploration of design options, design analysis and optimization will be impossible. CREATE has launched a program to identify mesh and grid generation roadblocks, and to develop a plan for reducing the time to generate meshes for the CREATE tools. The talk will discuss the CREATE program in general and the plans for improving the capability to generate meshes for CREATE design exploration, optimization and analysis tools.
Banquet Speaker: Scott Eberhardt
Biography: Scott Eberhardt spent twenty years as a Professor of Aeronautics and Astronautics at the University of Washington, before joining Boeing in 2006. In 2004, Scott was a consultant with the Museum of Flight, assisting researchers and writers in finding and documenting personal courage stories. As an aviation history buff and engineer, Scott began researching the engineering changes that occurred during WWI.
Abstract: Fighter Performance and Technology in The First World War
During the first one hundred years of flight great advances were made in fighter performance. However, fighter tactics developed in the early years of WWI are still in use today. A retrospective analysis of Seattle’s Museum of Flight collection of WWI fighters will show why certain aircraft were successful, where others weren’t. Climb and turn performance of these airplanes are compared and the tactics they fostered will be discussed. Speed, handling and stall speeds will be discussed in relation to the utility of these aircraft.