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AHPCRC Bulletin: Winter/Spring 1995 - Volume 5 Number 1-2

AHPCRC and ARL Hold a Joint Conference on CFD and Structural Mechanics

Marek Behr (AHPCRC) and Charles Nietubicz (ARL)

The Army Research Laboratory (ARL) hosted an AHPCRC-ARL Joint Conference on Computational Fluid Dynamics and Structural Mechanics at Aberdeen Proving Ground, Maryland in December 1994. The organizing committee was headed by Charles Nietubicz, Acting Chief of the Technology Integration Branch of the Advanced Simulation and High Performance Computing (ASHPC) Directorate at the ARL, and by Marek Behr from the AHPCRC-UM. The conference was aimed at initiating and intensifying collaboration between ARL, the Army Research Development and Engineer Centers (RDECs) and the academic partners of the AHPCRC. The host organization, the ARL, is a major Army resource for basic and applied research. It consists of eleven directorates, with the largest concentration of facilities located in Maryland. The conference opened on December 14 with welcoming remarks by William Mermagen, the Director of the ASHPC Directorate at ARL, and a set of introductory remarks by AHPCRC Director Tayfun Tezduyar and conference co-chairman Nietubicz. The speakers commented on the importance of the ARL-AHPCRC collaborative efforts to the success of the AHPCRC mission during its second contract period which commenced in January 1995. Some of these efforts are already underway and have achieved a degree of success. More faculty members, postdoctoral fellows, and graduate students at the AHPCRC-affiliated educational institutions are to be involved in the joint research projects.

Figure 1. Conference poster.
The first session of the conference opened with presentations by Kurt Fickie (ARL) on deformation and permeability in flow through porous media, and by Jeffrey Derby (AHPCRC-UM) on massively parallel finite element computations in materials processing research. The next session focused on Interior Ballistics research. Gloria Wren (ARL) reviewed physical problems in interior ballistics of guns, Sandy Dash (CRAFTechnology) spoke on CRAFT code simulations of multi-phase combusting flow and Michael Nusca (ARL) described the progress on the Army Next Generation Interior Ballistics Code. An overview of CFD research at Waterways Experiment Station was given by Jeffrey Holland (WES). Then, Tezduyar summarized the finite element computations of several flow problems currently being worked at the AHPCRC. The session was concluded with three more presentations from the Minnesota team. Shahrouz Aliabadi (AHPCRC-UM) described his work in 3D parallel finite element simulations; Behr described key concepts encountered in utilization of massively parallel CM-5 and Cray T3D supercomputers; Chris Waters (AHPCRC-UM) reviewed undergraduate student contributions to finite element computations and flow visualization at the AHPCRC. The remaining part of the day was allocated for topical discussion on the subjects of parallel computing and mesh generation, and for one-on-one technical discussions. The panel on mesh generation, led by Nietubicz, discussed current issues related to the need for responsive, interactive grid generation methodology. The need and use of adaptive gridding was also highlighted.

The second day of the meeting, December 15, provided for continuation of the one-on-one discussions, followed by a tour of the aerodynamics range. The range is a facility which measures the actual flight motion of projectiles up to 37 mm caliber under realistic conditions. It is the only range in the United States capable of obtaining accurate data on small- and medium-caliber projectiles. The tour continued on to the supercomputing facility, which provides leading-edge computing technology in the form of both scalable massively parallel processors and vector architectures. The ARL facility has also been recently named as one of four DoD Major Shared Resource Centers and will be acquiring and implementing new computing and network facilities as solicited in a Request for Proposal released on February 1, 1995.

The topics discussed later that day centered on current computational work in structural mechanics. John Condon (ARL) talked about structural response of structures subjected to mine blast loading. James Balsara (WES) gave an overview of computational structural mechanics at the Structures Laboratory of WES. The computational structural mechanics simulations at Tank-Automotive RDEC (TARDEC) were summarized by Raju Namburu (AHPCRC-TARDEC). After the mid-day break, Ernie Baker (ARDEC) spoke about simulations for warhead design, Graham Candler (AHPCRC-UM) about a data parallel LU relaxation method for the Navier-Stokes equations, and Paul Woodward (AHPCRC-UM), about simulation and visualization of turbulent fluid flow.

On the third day, December 16, the attendees heard Michael Unekis (ARL) discuss comparison of massively parallel processors for CFD application and Stephen Schraml (ARL) describe 3D simulations of time-dependent flow in multi-drive shock tubes. Subsequently, Jubaraj Sahu (ARL) gave a presentation on the Chimera technique which is employed to simulate flow past projectiles in relative motion. In the last presentation of the session, Olugbemiga Olatidoye (AHPCRC-CAU) described trends in CFD and structural dynamics computations at Clark Atlanta University (CAU). The second session of the day consisted of talks by Harris Edge (ARL) on zonal calculations for wrap-around missile fin configurations, by Paul Weinacht (ARL) on aerodynamic predictions for finned projectiles, and by Walter Sturek (ARL) on CFD code validation. After the lunch break, Andrew Johnson (AHPCRC-UM) discussed automatic mesh generation and update issues arising in 3D finite element fluid flow computations. Jerry Clarke (AHPCRC-ARL) continued with a presentation of a network distributed global memory model and its use in distributed interactive flow field simulator. The final talk of the session was given by Steve Wilkerson (ARL) and was devoted to the modeling of gun tube dynamics of M1 tank. The conference was concluded with closing remarks by Tezduyar.

The individual meetings and discussions that took place throughout the conference gave rise to or intensified several collaborative research efforts. Among them is joint AHPCRC-ARL work on the transition of multi-zonal fluid flow codes used by the ARL Weapon Technology Division to the massively parallel platforms, and continuing work on the liquid propellant gun.