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AHPCRC Bulletin: Spring 1994 - Volume 4 Number 2

AHPCRC and Army Scientists Make a Strong Showing at the Second Japan-U.S. Finite Element Symposium in Tokyo

Tayfun Tezduyar, AHPCRC/Aerospace Engineering and Mechanics

The Second Japan-U.S. Symposium on Finite Element Methods in Large-Scale Computational Fluid Dynamics was held on March 14P16, 1994 at Surugadai Memorial Hall of Chuo University in Tokyo, Japan. The three-day symposium was sponsored by the Chuo University Institute of Science and Engineering and was organized by Mutsuto Kawahara, Chuo University, Tayfun Tezduyar, AHPCRC, and Thomas Hughes, Stanford University. This symposium is the second in the series of joint US-Japan symposia. The first symposium was held at the University of Minnesota in October 1992; it was sponsored by the AHPCRC, the Supercomputer Institute and Thinking Machines Corporation, and was organized by the same team.

The symposium started with welcoming remarks from Mutsuto Kawahara; it had eleven regular sessions and a panel session on Trends in High-Performance Computing in Fluid Mechanics Applications. There were over 140 participants, with 19 invited speakers and panel members from the U.S., including U.S. Army and AHPCRC speakers, and 31 Japanese speakers. Among the topics covered at the Symposium were: novel techniques and advanced algorithms in finite element computation of compressible and incompressible flows with applications in high Reynolds number flows; flows with moving boundaries and interfaces; fluid- structure interactions; high-pressure, nearly incompressible flows with moving mechanical components; impact dynamics; free-surface flows; shallow water modeling; optimal control; and materials processing and manufacturing. Many of the applications presented involved 3D computations. Also covered were mesh generation, adaptive methods, iterative solution strategies, and parallel computing.

Several invited papers were presented by the AHPCRC and Army Scientists and their collaborators. Gloria Wren, Army Research Laboratory (ARL), presented her joint work with Steve Ray, AHPCRC, Shahrouz Aliabadi, AHPCRC, and Tezduyar on Space-Time Finite Element Computation of Compressible Flow Between Moving Components. The application problem in this presentation was injector flow in the orifice of a regenerative liquid propellant gun (RLPG). With a paper titled, Modeling Impact Phenomena on Vector and Parallel Supercomputers, Kent Kimsey, ARL, presented his work on impact dynamics. This presentation included computations carried out on the AHPCRC Connection Machines. Tezduyar's presentation started with a brief description of the AHPCRC and its mission, and continued with an overview of his group's parallel computations of compressible flow applications. The paper, Massively Parallel Compressible Flow Computations in Aerospace Applications, was co-authored by Aliabadi. Sanjay Mittal, AHPCRC, with a paper titled, Massively Parallel Finite Element Simulation of Incompressible Flows, co- authored by Tezduyar, presented several incompressible flow applications computed at the AHPCRC by this group.

Kazuo Kashiyama, Chuo University, who spent six months at the AHPCRC in 1993, presented his joint work with H. Ito, Chuo University, Marek Behr, AHPCRC, and Tezduyar. The paper, Massively Parallel Finite Element Strategies for Large-Scale Computation of Shallow Water Flows and Contaminant Transport, described on the AHPCRC's CM-5, the simulation of water waves and pollution spread in Tokyo Bay. This problem was featured on the cover page of the pre-conference proceedings of the Symposium. John Kennedy, Thinking Machines Corporation, presented, A Strategy for Implementing Implicit Finite Element Methods for Incompressible Flows on the CM-5, a joint work with AHPCRC researchers Behr, Vinay Kalro, and Tezduyar. Jeff Derby, AHPCRC, presented his group's work on Massively Parallel Finite Element Analysis of Large-Scale Crystal Growth Processes: Rotating and Coupled Flows. The paper was co-authored by Qiang Xiao, Andrew Salinger, and Yuming Zhou, all from the AHPCRC.

In the panel session, each panel memberQJagdish Chandra, Director, Mathematical and Computer Science Division, Army Research Office, Charles Holland, Director, Mathematics and Computer Sciences, Air Force Office of Scientific Research, and Nobuyuki Satofuka, Kyoto Institute of TechnologyQfirst gave a presentation on their views on high- performance computing issues in fluid mechanics applications, as well as other related applications and future HPC trends. Following that, the panel session continued with free-format discussions between the panel members and the audience. The participants followed these discussions with great interest all the way to the end of the allotted time for the panel session.

A remarkably large number of scientists from Japanese industry participated in the Symposium. The last of day of the Symposium, still with nearly all of the participants in attendance, ended with closing remarks by Tezduyar, together with his announcement that the Third Symposium is planned to be held at the University of Minnesota in April 1996.