2006 HPCMP Users Group Conference (HPCMP-UGC'06)最新文献

{"title":"Progress Towards Modeling Ship/Aircraft Dynamic Interface","authors":"S. Polsky","doi":"10.1109/HPCMP-UGC.2006.59","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.59","url":null,"abstract":"Previous efforts, for which high performance computing modernization program (HPCMP) computer time was utilized, employed state-of-the-art computation fluid dynamics (CFD) methods to create time-accurate ship airwake models that are far beyond the rudimentary stochastic airwake models used previously. Realistic airwake models are required for realistic pilot workload and aircraft performance characteristics. The CFD airwake models were integrated with existing flight simulation models in a semi-coupled fashion such that the aircraft performance is affected by the presence of the ship airwake, but the airwake characteristics are not affected by the presence of the aircraft. This semi-coupled approach has worked relatively well for applications such as ship design comparisons for first-order airwake effects on aircraft operations. However, the lack of coupling between the ship and aircraft has limited the usefulness of flight simulations for applications such as flight envelope development and aircraft test and evaluation. This paper examines the initial steps taken through the HPCMP Grand Challenge program to model the coupled ship and aircraft system","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130493850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Statistical Fatigue and Residual Strength Analysis of New/Aging Aircraft Structure","authors":"S. Fawaz, B. Andersson","doi":"10.1109/HPCMP-UGC.2006.66","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.66","url":null,"abstract":"The structural integrity of both military and civilian transport aircraft fleets is governed by Department of Defense and Federal Aviation Administration regulations, respectively, dictating use of fracture mechanics techniques to determine the durability and damage tolerance of the aircraft structure. Driven by economic pressures, both fighter and transport aircraft are remaining in service longer than their original design lifetimes. Maintaining mission readiness and ensuring the safety of the flying public is of utmost concern and the responsibility of the aircraft manufacturers, aircraft operators, and airworthiness authorities. In general, a fracture mechanics based crack growth prediction model is just another tool in the designer and maintainer's toolbox to safely and efficiently manufacture and operate the aircraft. Furthermore, state-of-the-art fatigue life prediction algorithms may only consider simple, well-behaved structural cracking problems. Unfortunately, all modern aircraft are complex assemblies with diverse materials and joining methods. As a result, mission planners and combat leaders are forced to maintain the old paradigm of over-conservative fatigue life predictions and find-it and fix-it corrosion control programs. As a result, the main outcome of our Challenge Project is better fleet management through more robust fatigue life predictions in both peace- and war-time","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126480442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Applications in Parallel MATLAB","authors":"B. Guilfoos, J. Gardiner, J. C. Chaves, J. Nehrbass, S. Ahalt, A. Krishnamurthy, J. Unpingco, A. Chalker, L. Humphrey, S. Samsi","doi":"10.1109/HPCMP-UGC.2006.4","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.4","url":null,"abstract":"The parallel MATLAB implementations used for this project are MatlabMPI and pMATLAB, both developed by Dr. Jeremy Kepner at MIT-LL. MatlabMPI is based on the message passing interface standard, in which processes coordinate their work and communicate by passing messages among themselves. The pMATLAB library supports parallel array programming in MATLAB. The user program defines arrays that are distributed among the available processes. Although communication between processes is actually done through message passing, the details are hidden from the user. The objective of this PET project was to develop parallel MATLAB code for selected algorithms that are of interest to the Department of Defense (DoD) signal/image processing (SIP) community and to run the code on the HPCMP systems. The algorithms selected for parallel MATLAB implementation were a support vector machine (SVM) classifier, metropolis-Hastings Markov chain Monte Carlo (MCMC) simulation, and content-based image compression (CBIC)","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129040343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Massively Parallel Simulations on Light-Induced Charge Transfer in Molecules","authors":"M. Pederson, W. A. Anderson, T. Baruah, B. Powell","doi":"10.1109/HPCMP-UGC.2006.44","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.44","url":null,"abstract":"The development of environmentally friendly, inexpensive, lightweight solar cells would significantly enhance both sea- and land- based DoD operations and directly enhance global security through a reduction of competition for carbon-based fuels. For example, capturing one out of every 10000 photons from the sun would provide all the power the world currently uses. Approximately 75% of the solar radiation striking the upper atmosphere (1368 W/m2 = 8555 eV/sec/nm2 ) reaches the surface of the earth and most of this is in the form of photons with more than 1 eV of energy since water vapor and other atmospheric constituents effectively absorb energy below this threshold. In order to produce a one micron photovoltaic molecular film (composed of approximately 1000 layers of a molecule) with 10-20 percent efficiency, each molecule would have to create 1-3 eV/sec. Since the available solar radiation is in the 1-4 eV range, this implies ~1-3 electron-hole pairs per second which biological systems currently achieve. As such, various organic molecules, some of which are biologically inspired, have been proposed as alternative building blocks for solar energy materials. In the first phase of our challenge project, we have performed calculations on a molecular triad composed of a fullerene, a porphyrin and a carotenoid polyene. By calculating electronic structures, approximate excited states and respective dipole transition rates, we have simulated charge transfer dynamics in a collection of molecules exposed to an appropriate bath of solar photons. The resulting time constants associated with capture of solar radiation in the form of a charge-separated state have been determined. In the first phase of this challenge project, only electronic excitations were considered in the kinetic Monte Carlo modeling. Furthermore, the low symmetry in the molecular triad made it relatively easy to identify charge transfer excitations. In this phase of the project we report four new computationally intensive investigations that are aimed at validating and extending the formalism. First, to justify the use of an approximate excited state formalism, we have performed analogous calculations of excited states on a much larger selection of molecules and atoms and compared these results to experiment. Second we have performed calculations entirely analogous to our earlier molecular-triad results on highly idealized and high-symmetry fullerene tubules. Third we have used and extended a recently developed method to calculate all electron-hole-phonon interactions in these carbon nanotubes as well as the light-harvesting molecular triad. Fourth, in analogy to symmetry-breaking methods used for density-functional treatments of ferro- and ferri- magnetic ordering in molecular magnets, we have developed and tested a massively parallel computational method, employing coarse and fine-grain strategies, for identifying self trapped ferroelectric excited states in highly symmetric carbon na","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134645840","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"LES and DES of High Reynolds Number, Supersonic Base Flows with Control of the Near Wake","authors":"J. Sivasubramanian, H. Fasel","doi":"10.1109/HPCMP-UGC.2006.42","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.42","url":null,"abstract":"The drag associated with supersonic base flows is of critical importance for the design of aerodynamic bodies, such as missiles and projectiles. The base drag which accounts for a significant part of the total drag may be reduced by means of active and passive control of the near wake. There is evidence that large (turbulent) coherent structures evolve in these flows and strongly influence the mean flow. Therefore, in order to understand the dynamics of coherent structures in the wake and how flow control mechanisms modify these structures, numerical simulations were conducted. We performed large-eddy simulations (LES) based on the flow simulation methodology (FSM) for a Reynolds number of ReD = 100,000 and Mach number M = 2.46 using a high-order accurate research code, which was developed at the University of Arizona. Flow control mechanisms that alter the near wake by introducing axisymmetric and three-dimensional perturbations, thus emulating active and passive flow control were investigated. We also studied supersonic base flows at Reynolds number ReD = 3,300,000 and Mach number M = 2.46 using detached-eddy simulations (DES). These investigations were performed using the commercial CFD-code Cobalt. In addition, for the same Reynolds number, we investigated passive flow control using afterbody boat-tailing. Our results are compared to available experimental data","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"440 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133074897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Blade-Vortex Interaction Airloads Prediction Using Multidisciplinary Coupling","authors":"Joon W. Lim, M. Potsdam, R. Strawn, B. Sim, T. Nygaard","doi":"10.1109/HPCMP-UGC.2006.7","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.7","url":null,"abstract":"Predictions of blade-vortex interaction (BVI) noise, using blade airloads obtained from a coupled aerodynamic, structural, and acoustics methodology, are presented. This methodology uses an iterative, loosely-coupled trim strategy for exchanging information between the computational fluid dynamics (CFD) code OVERFLOW-2 and the computational structural dynamics (CSD) and rotorcraft comprehensive code CAMRAD-II. Results are compared to the HART-II rotor baseline conditions. It is shown that this state-of-the-art CFD/CSD approach is able to capture BVI induced blade airloads and noise radiation characteristics. Predicted BVI airloads on the advancing and retreating sides agree well with the measured data. Although the BVI airloads and noise amplitudes are generally under-predicted, the CFD/CSD coupled methodology provides an overall noteworthy improvement over the lifting line aerodynamics with free-wake models typically used for CSD comprehensive analysis","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122943934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrodynamics Prediction of High Speed Sea Lift (HSSL) Ships","authors":"J. Gorski, R. Miller, P. Carrica, M. Kandasamy, T. Xing, F. Stern","doi":"10.1109/HPCMP-UGC.2006.38","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.38","url":null,"abstract":"High speed sea lift (HSSL) is an important area of interest for the US Navy. Computational tools are needed to predict the hydrodynamics of these multihull configurations for their proper design and analysis in many areas including resistance and powering, motions and habitability, loads in service and maneuverability. To address these issues requires a hierarchy of computational and experimental capabilities. Described here are efforts underway to use unsteady Reynolds averaged Navier-Stokes (URANS) solvers to answer some of these needs. Specifically, computations are demonstrated with CFDSHIP-Iowa to predict relevant HSSL catamaran and trimaran configurations under a variety of operating conditions in both calm water and with waves. Many of these predictions, particularly those representing behavior in various sea states, are very computationally intensive and thus require high performance computing resources. The predictions demonstrated here are paving the way for a computational capability to aid in the design for a new generation of naval ships","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116993583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Simulations of Explosive Blast Pressures During Wall Breaching","authors":"S. Akers, J. Ehrgott, D. Rickman","doi":"10.1109/HPCMP-UGC.2006.54","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.54","url":null,"abstract":"During the past several years, the US Army has focused considerable attention toward developing improved methods for breaching walls and determining weapon-target interaction effects from direct- and indirect-fire weapons in the urban combat environment. A major thrust area is centered on developing methods for predicting the blast and fragmentation environment behind a breached wall. This information is important to the warfighter in terms of recognizing the expected impact on both enemy combatants, and non-combatants or friendly forces. One impediment to this effort is that little data exist to document the behind-wall blast environment produced by the detonation of explosives against or within walls. As part of the Army's effort, the US Army Engineer Research and Development Center (ERDC) is conducting experimental and numerical investigations to improve wall breaching methods. In the experimental and numerical programs, the ERDC conducts comprehensive research on a full range of urban construction materials. As a first step in this process, the ERDC conducted a baseline study of C-4 breaching effectiveness against steel-reinforced-concrete (RC) walls. A goal of this effort was to better define the behind wall blast environment produced by various C-4 charges placed in contact with RC walls. Numerical simulations of selected experiments were conducted using the coupled Eulerian-Lagrangian code Zapotec. In these simulations, the concrete and reinforcing steel were modeled as Lagrangian materials, and the C-4 and air were modeled as Eulerian materials","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114898794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancements to MatlabMPI: Easier Compilation, Collective Communication, and Profiling","authors":"J. Gardiner, J. Nehrbass, J. C. Chaves, B. Guilfoos, S. Ahalt, A. Krishnamurthy, J. Unpingco, A. Chalker, S. Samsi","doi":"10.1109/HPCMP-UGC.2006.24","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.24","url":null,"abstract":"This paper provides a brief overview of several enhancements made to the MatlabMPI suite. MatlabMPI is a pure MATLAB code implementation of the core parts of the MPI specifications. The enhancements provide a more attractive option for HPCMP users to design parallel MATLAB code. Intelligent compiler configuration tools have also been delivered to further isolate MatlabMPI users from the complexities of the UNIX environments on the various HPCMP systems. Users are now able to install and use MatlabMPI with less difficulty, greater flexibility, and increased portability. Collective communication functions were added to MatlabMPI to expand functionality beyond the core implementation. Profiling capabilities, producing TAU (tuning and analysis utility) trace files, are now offered to support parallel code optimization. All of these enhancements have been tested and documented on a variety of HPCMP systems. All material, including commented example code to demonstrate the usefulness of MatlabMPI, is available by contacting the authors","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123596017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Development of a Utility of Assessing the Performance Impact of Shared/Distributed File Systems and Database Interactions in High-Performance Simulations","authors":"Andrew Watkins, R. Schumeyer","doi":"10.1109/HPCMP-UGC.2006.70","DOIUrl":"https://doi.org/10.1109/HPCMP-UGC.2006.70","url":null,"abstract":"We present the development of a tool for analyzing the interactions between parallel/distributed file systems and databases in a Linux cluster environment. We begin with an overview of existing file system and database technology. We then discuss the actual design of the tool. A sample set of results on a small Linux cluster using NFS and Postgres are presented and analyzed by way of a demonstration and discussion of how this utility may be used for performance assessment","PeriodicalId":173959,"journal":{"name":"2006 HPCMP Users Group Conference (HPCMP-UGC'06)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131787101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}