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检索条件"任意字段=2010 DoD High Performance Computing Modernization Program Users Group Conference, HPCMP UGC 2010"

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The high performance Embedded computing Software Initiative: C++ and parallelism extensions to the vector, signal, and image processing library standard

The High Performance Embedded Computing Software Initiative:...

引用

Annual conference on high performance computing modernization program

作者： Campbell, D Georgia Tech Res Inst Sensors & Electromagnet Applicat Lab Smyrna GA USA

ISBN: (纸本)0769524966

The high performance Embedded computing Software Initiative (HPEC-SI) program is developing a unified computation and communication Application programming Interface (API) and framework for high performance signal processing tasks on parallel computers. The goal of the program is to address the high cost of software in Department of Defense (dod) systems by improving the portability and productivity of signal processing application development threefold, while improving performance by one half compared to current practices. This paper describes the motivation for the HPEC-SI program, its goals and approaches, and progress of the HPEC-SI Working groups in extending the Vector, Signal, and Image Processing Library (VSIPL) standard to C++ and transparent operation in parallel computing systems. The C++ extension to VSIPL is described, and highlights of its advantages are considered. This paper also examines results from the Demonstration Working group, and describes requirements and plans developed by the Applied Research Working group for data parallel extensions to VSIPL and describes Development Working group progress so far in developing parallel VSIPL.

关键词： Computer software

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Simulations for microbubble drag reduction (MBDR) at high Reynolds numbers

Simulations for microbubble drag reduction (MBDR) at high Re...

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Annual conference on high performance computing modernization program

作者： Maxey, MR Dong, S Xu, J Karniadakis, GE Brown Univ Div Appl Math Providence RI 02912 USA

ISBN: (纸本)0769524966

Simulations of turbulent channel flows at Re. = 135 - 400, seeded with microbubbles, have been used to investigate the dynamics of microbubble drag reduction. The bubbles are found to exert an effective streamwise body force on the flow that retards the near-wall flow and results in a reduction in drag. Besides this density effect of the bubbles there is a suspension viscosity effect, and both depend on the local void fraction and bubble size. In addition, collisions or contacts between bubbles can lead to an enhanced dispersion at larger void fractions. These features are investigated for a range of conditions to guide the development of RANS models.

关键词： Bubbles (in fluids)

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Analysis of the RCS and high resolution synthetic radar track data for the space Shuttle mission STS-114

Analysis of the RCS and high resolution synthetic radar trac...

引用

Annual conference on high performance computing modernization program

作者： Hill, K Macon, C Kent, B Van, T USAF Res Lab Sensor Directorate Wright Patterson AFB OH 45433 USA

ISBN: (纸本)0769524966

For future Shuttle missions, a radar system consisting of a new wideband C-band radar and two Weibel continuous pulse Doppler X-band radars has been implemented for adequate detection of debris during launch and ascent. Three radars will digitally record tracking data of the Shuttle from launch until signal is lost with the primary timeframe of interest being launch to launch plus 150 seconds. In this paper, radar cross sections and range profiles of the Shuttle are computed by Xpatch for these three radars.

关键词： range-time-intensity radar cross section range profile retum-to-flight mission physical optics Space Shuttle Launch Vehicle

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high accuracy DNS and LES of high Reynolds number, supersonic base flows and passive control of the near wake

High accuracy DNS and LES of high Reynolds number, supersoni...

引用

Annual conference on high performance computing modernization program

作者： von Terzi, DA Sandberg, RD Sivasubramanian, J Fasel, HF Univ Arizona Tucson AZ 85721 USA

ISBN: (纸本)0769524966

Supersonic axisymmetric base flows are prototypical for flows behind projectiles and missiles. For these flows, drag reduction can be achieved by means of passive control of the near wake. Thereby large (turbulent) coherent structures play a dominant role. The objective of the present investigation is to elucidate if and how successful passive flow control techniques modify these structures. To this end, first Direct Numerical Simulations (DNS) for a Reynolds number of Re-D = 100,000 and Mach number of Ma =2.46 were performed using a high-order accurate and highly parallelized research code which was developed at the University of Arizona. Thereby, roughly 52 million grid points were employed. The DNS data serve to visualize typical structures of the unsteady flow field and to verify IQ the use of less computational costly RANS/LES methods is applicable for this flow. Two of these methods, the Flow Simulation Methodology (FSM) and Detached Eddy Simulations (DES), were then employed to investigate the supersonic base flow at Re-D =33 x 10(6) and Ma = 2.46 using between 460, 000 and seven million grid points. For the DES, the commercial CFD-code Cobalt was employed This unstructured grid solver allowed then to perform simulations with boat-tailing. The obtained mean flow data are compared to available experimental results.

关键词： Supersonic flow

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Editor's preface: Proceedings of the 2004 dod hpcmp users group conference

Editor's preface: Proceedings of the 2004 DoD HPCMP users gr...

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dod hpcmp users group conference, ugc 2004

作者： Peterkin, Jr., Robert E. DoD HPCMP

No abstract available

ISBN: (纸本)0769522599

No abstract available

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HPC performance analysis of a distributed information enterprise simulation

HPC performance analysis of a distributed information enterp...

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dod hpcmp users group conference, ugc 2004

作者： Hanna, James P. Walter, Martin J. Hillman, Robert G. Advanced Computing Technology Branch Rome NY United States

ISBN: (纸本)0769522599

Simulations of distributed information enterprises using the DIEMS framework[1] were performed on HPC clusters and SMP machines. The simulation results were analyzed with respect to the computation time involved in each process, the number of times processes were executed, the number of simulation rollbacks invoked during each simulation, simulation overhead, and the total wall clock time used to perform the simulation. The analysis identified several performance limitations and bottlenecks. One critical limitation addressed and eliminated was simultaneously mixing a periodic process model with an event driven model causing rollbacks. The second major factor limiting performance on cluster based systems was the cross-node communication. An optimization technique that exploits the knowledge of the publication and subscription paradigm of the information architecture being simulated was developed. This paper describes the simulation analysis, the modifications to the simulation models, the development of an optimization technique, and the impact of the code improvements on simulation performance.

关键词： Distributed computer systems

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Proceedings - users group conference, ugc 2004

Proceedings - Users Group Conference, UGC 2004

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dod hpcmp users group conference, ugc 2004

ISBN: (纸本)0769522599

The proceedings contain 50 papers from the users group conference, ugc 2004. The topics discussed include: first principles calculations of the chemisorption properties of nitro-containing molecules on the Al 2O3(0001) surface;defense against chemical warfare agents and toxic industrial chemicals (TICS);large-scale quantum-mechanical simulations of nanoscale devices and new materials;potential discrepancies in radar signature predictions for ground vehicles;network simulation of the electronic battlefield;seismic waves from light trucks moving over terrain;RANS and detached-eddy simulation of the NCCR airfoil;and towards prediction of environmental Arctic change.

关键词： Chemical warfare

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Towards a high-resolution global coupled Navy prediction system

Towards a high-resolution global coupled Navy prediction sys...

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dod hpcmp users group conference, ugc 2004

作者： McClean, Julie L. Thoppil, Prasad Ivanova, Detelina Stark, Donald Maltrud, Mathew Hunke, Elizabeth May, Paul Carton, James Giese, Benjamin Monterey CA United States Los Alamos National Laboratory Los Alamos NM United States Monterey CA United States University of Maryland College Park MD United States Texas A and M University College Station TX United States

ISBN: (纸本)0769522599

The development of a fully coupled global atmosphere-ocean prediction system for short-term forecasting at the Naval Research Laboratory at Monterey (NRL-MRY), was described. The global coupled coupled Navy Operational Global Atmospheric System (NOGAPS) /Parallel Ocean program (POP) system is being used to investigate seasonal forecasts of the atmosphere and ocean. By the use of Simple Ocean Data Assimilation Scheme (SODA), the model forecast from 0.4° global POP has been combined with an estimate of corrections based on a set of observations consisting of temperature and salinity from hydrography and satellite-derived SST. The inclusion of ice in the coupled system will provide a more realistic time-dependent bottom boundary layer to NOGAPS.

关键词： Weather forecasting

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high-accuracy DNS of supersonic base flows and control of the near wake

High-accuracy DNS of supersonic base flows and control of th...

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dod hpcmp users group conference, ugc 2004

作者： Sandberg, Richard D. Fasel, Hermann F. University of Arizona Department of Aerospace and Mechanical Engineering Tucson AZ United States

ISBN: (纸本)0769522599

Large-scale numerical simulations of axisymmetric, supersonic base flows were conducted at various Reynolds numbers. Direct Numerical Simulations (DNS) were employed to investigate the hydrodynamic stability behavior of the near-wake region. As a consequence of physical flow instabilities, large coherent structures evolve that have a significant impact on the mean flow wand and are responsible for a considerable amount of base-drag. It is demonstrated that the deliberate exclusion or reinforcement of certain helical modes can lead to a rise in bas -pressure and thus decrease the drag of a blunt body at supersonic speed. For these investigations, a high-order accurate compressible Navier-Stokes solver in cylindrical coordinates with high parallel efficiency was developed and employed on the SGI Origin 3900 shared memory complex at the ERDC MSRC. In addition to providing vital insight into the physical mechanisms in supersonic base flows, the DNS results are intended for use as benchmark data for the development of a Flow Simulation Methodology (FSM) for high Reynolds number turbulent flows. © 2004 IEEE.

关键词： Wakes

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Large-scale atomistic simulations of nanoindentation and crack propagation under compression

Large-scale atomistic simulations of nanoindentation and cra...

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dod hpcmp users group conference, ugc 2004

作者： Kalia, Rajiv K. Nakano, Aiichiro Szlufarska, Izabela Vashishta, Priya Collaboratory for Advanced Computing and Simulations University of Southern California Los Angeles CA Department of Materials Science and Engineering University of Southern California Los Angeles CA Department of Physics and Astronomy University of Southern California Los Angeles CA Department of Computer Science University of Southern California Los Angeles CA

ISBN: (纸本)0769522599

Large-scale molecular dynamics (MD) simulations have been performed on parallel computers to study nanoindentation-induced amorphization in silicon carbide crystal. The load-displacement response exhibits an elastic shoulder followed by a plastic regime consisting of a series of load drops. Analyses of bond angles, local pressure and shear stress, and shortest-path rings show that these load drops are related to dislocation activities under the indenter. We have found that amorphization is driven by the coalescence of dislocation loops and that there is a strong correlation between load-displacement response and ring distribution. Current efforts focus on large-scale MD simulations of (a) nanoindentation in amorphous and nanophase SiC and (b) crack propagation in amorphous and nanostructured SiO2 under compression. © 2004 IEEE.

关键词： Molecular dynamics

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