检索结果-内蒙古大学图书馆

Data structure and movement for lattice-based simulations

Physical Review E 2013年第1期88卷 013314-013314页

作者： Aniruddha G. Shet Shahajhan H. Sorathiya Siddharth Krithivasan Anand M. Deshpande Bharat Kaul Sunil D. Sherlekar Santosh Ansumali Parallel Computing Lab Intel Labs Bangalore 560103 India Engineering Mechanics Unit Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur Bangalore 560064 India

We show that for the lattice Boltzmann model, the existing paradigm in computer science for the choice of the data structure is suboptimal. In this paper we use the requirements of physical symmetry necessary for recovering hydrodynamics in the lattice Boltzmann description to propose a hybrid data layout for the method. This hybrid data structure, which we call a structure of an array of structures, is shown to be optimal for the lattice Boltzmann model. Finally, the possible advantages of establishing a connection between group theoretic symmetry requirements and the construction of the data structure is discussed in the broader context of grid-based methods.

关键词： DATA structures (Computer science) LATTICE theory SIMULATION methods & models LATTICE Boltzmann methods HYDRODYNAMICS COMPUTATIONAL grids (Computer systems)

来源：评论

学校读者我要写书评

暂无评论

Solution of a low Prandtl number natural convection benchmark by a local meshless method

Solution of a low Prandtl number natural convection benchmar...

引用

作者： Kosec, Gregor Šarler, Božidar Laboratory for Parallel and Distributed Computing Jožef Stefan Institute Ljubljana Slovenia Laboratory for Multiphase Processes University of Nova Gorica Nova Gorica Slovenia Laboratory for Advanced Materials Systems Centre of Excellence for Biosensorics Automation and Process Control Solkan Slovenia

Purpose - The purpose of this paper is to present the solution of a highly nonlinear fluid dynamics in a low Prandtl number regime, typical for metal-like materials, as defined in the call for contributions to a numerical benchmark problem for 2D columnar solidification of binary alloys. The solution of such a numerical situation represents the first step towards understanding the instabilities in a more complex case of macrosegregation. Design/methodology/ approach - The involved temperature, velocity and pressure fields are represented through the local approximation functions which are used to evaluate the partial differential operators. The temporal discretization is performed through explicit time stepping. Findings - The performance of the method is assessed on the natural convection in a closed rectangular cavity filled with a low Prandtl fluid. Two cases are considered, one with steady state and another with oscillatory solution. It is shown that the proposed solution procedure, despite its simplicity, provides stable and convergent results with excellent computational performance. The results show good agreement with the results of the classical finite volume method and spectral finite element method. Originality/value - The solution procedure is formulated completely through local computational operations. Besides local numerical method, the pressure velocity is performed locally also, retaining the correct temporal transient. © Emerald Group Publishing Limited.

关键词： Numerical methods

来源：评论

学校读者我要写书评

暂无评论

Meta-Metaworkflows for Combining Quantum Chemistry and Molecular Dynamics in the MoSGrid Science Gateway

Meta-Metaworkflows for Combining Quantum Chemistry and Molec...

引用

International Workshop on Science Gateways (IWSG)

作者： Sonja Herres-Pawlis Alexander Hoffmann Luis de la Garza Jens Krüger Sandra Gesing Richard Grunzke Wolfgang E. Nagel Gabor Terstyansky Noam Weingarten Fakultät für Chemie und Pharmazie Ludwig-Maximilians-Universität München München Germany Appl. Bioinf. Tubingen Universitatsklinikum Tubingen Tubingen Baden-WÃ¼rttemberg DE Zentrum für Informationsdienste und Hochleistungsrechnen Technische Universität Dresden Dresden Germany Applied Bioinformatics Tübingen University of Tübingen Tübingen Germany Centre for Parallel Computing University of Westminster London UK University of Notre Dame 123 Information Technology Center Notre Dame IN USA

MoSGrid (Molecular Simulation Grid) is a user-friendly and highly efficient science gateway which contains three domains for the different methodologies used in chemistry: quantum chemistry, molecular dynamics, and docking. Workflows are implemented by using the WS-PGRADE technology. By adding an abstraction layer, we are able to develop meta-metaworkflows for quantum chemical applications and a combination between quantum chemical and molecular dynamics applications. This approach allows researchers to easily and more quickly create highly complex workflows allowing them to shorten the time-to-result considerably.

关键词： Logic gates Chemicals Computational modeling Concrete Abstracts Middleware

来源：评论

学校读者我要写书评

暂无评论

Timpani drum synthesis in 3D on GPGPUS

Timpani drum synthesis in 3D on GPGPUS

引用

15th International Conference on Digital Audio Effects, DAFx 2012

作者： Bilbao, Stefan Webb, Craig Acoustics Group Edinburgh Parallel Computing Centre University of Edinburgh United Kingdom

Physical modeling sound synthesis for systems in 3D is a computationally intensive undertaking;the number of degrees of freedom is very large, even for systems and spaces of modest physical dimensions. The recent emergence into the mainstream of highly parallel multicore hardware, such as general purpose graphical processing units (GPGPUs) has opened an avenue of approach to synthesis for such systems in a reasonable amount of time, without severe model simplification. In this context, new programming and algorithm design considerations appear, especially the ease with which a given algorithm may be parallelized. To this end finite difference time domain methods operating over regular grids are explored, with regard to an interesting and non-trivial test problem, that of the timpani drum. The timpani is chosen here because its sounding mechanism relies on the coupling between a 2D resonator and a 3D acoustic space (an internal cavity). It is also of large physical dimensions, and thus simulation is of high computational cost. A timpani model is presented, followed by a brief presentation of finite difference time domain methods, followed by a discussion of parallelization on GPGPU, and simulation results.

关键词： Finite difference time domain method

来源：评论

学校读者我要写书评

暂无评论

Binaural simulations using audio rate FDTD schemes and CUDA

Binaural simulations using audio rate FDTD schemes and CUDA

引用

15th International Conference on Digital Audio Effects, DAFx 2012

作者： Webb, Craig J. Bilbao, Stefan Acoustics Group Edinburgh Parallel Computing Centre University of Edinburgh United Kingdom

Three dimensional finite difference time domain schemes can be used as an approach to spatial audio simulation. By embedding a model of the human head in a 3D computational space, such simulations can emulate binaural sound localisation. This approach normally relies on using high sample rates to give finely detailed models, and is computationally intensive. This paper examines the use of head models within audio rate FDTD schemes, ranging from 176.4 down to 44.1 kHz. Using GPU computing with Nvidia's CUDA architecture, simulations can be accelerated many times over a serial computation in C. This allows efficient, dynamic simulations to be produced where sounds can be moved around during the runtime. Sound examples have been generated by placing a personalised head model inside an anechoic cube. At the lowest sample rate, 44.1 kHz, localisation is clear in the horizontal plane but much less so in the other dimensions. At 176.4, there is far greater three dimensional depth, with perceptible front to back, and some vertical movement.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Programming for GPUs: The Directive-Based Approach

Programming for GPUs: The Directive-Based Approach

引用

International Conference on P2P, parallel, Grid, Cloud and Internet computing (3PGCIC)

作者： Lucas Grillo Francisco De Sande Juan J. Fumero Ruymán Reyes Dept. de EIO y Computación Universidad de La Laguna La Laguna Spain Instituto Tecnológico de Energías Renovables Granadilla de Abona Spain Edinburgh Parallel Computing Centre University of Edinburgh Edinburgh UK

In the last years, hardware accelerators, such as GPUs have become ubiquitous in the HPC landscape and GPGPU has been massively adopted by the HPC research community. If something is slowing down further expansion of this technology are its difficulties in terms of programmability. Although several libraries and applications providing GPU support are available, the need of implementing new algorithms from scratch, or adapting sequential programs to accelerators, still exist. Writing programs to be executed on accelerators is not easy, particularly for non-expert developers coming from the science or engineering fields, as it requires deep understanding of the underlying architecture. Different alternatives have appeared aimed to diminish the GPU programming effort. In the wake of the success of OpenMP, several directive-oriented programming models have been created. Although future OpenMP releases will integrate accelerators, tools are needed in the meantime. In this work, we present a comparison of directive-based approaches for GPU platforms, hiCUDA, PGI Accelerator and OpenACC. For the last, in addition to the two commercial compilers available, we include results using accULL, our own OpenACC implementation. To illustrate the portability of these alternatives, we show performance figures for both Fermi and Kepler NVIDIA cards.

关键词： Graphics processing units Kernel Programming Standards Runtime parallel processing

来源：评论

学校读者我要写书评

暂无评论

User-friendly workflows in quantum chemistry 5

User-friendly workflows in quantum chemistry

引用

5th International Workshop on Science Gateways, IWSG 2013

作者： Herres-Pawlis, Sonja Hoffmann, Alexander Gesing, Sandra Krüger, Jens Balasko, Akos Kacsuk, Peter Grunzke, Richard Birkenheuer, Georg Packschies, Lars Brinkmann, Andre Terstyansky, Gabor Weingarten, Noam Fakultät für Chemie und Pharmazie Department Chemie Ludwig-Maximilians-Universität München Butenandtstr. 5-13 München81377 Germany Center for Bioinformatics Tübingen University of Tübingen Sand 14 Tübingen72076 Germany MTA SZTAKI Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary Zentrum für Informationsdienste und Hochleistungsrechnen Technische Universität Dresden Zellescher Weg 12-14 Dresden01062 Germany Paderborn Center for Parallel Computing University of Paderborn Warburger Str. 100 Paderborn33098 Germany Regionales Rechenzentrum Universität zu Köln Weyertal 121 50931 Germany Zentrum für Datenverarbeitung University of Mainz Saarstraße 21 Mainz55122 Germany Centre for Parallel Computing School of Electronics and Computer Science University of Westminster 115 New Cavendish Street LondonW1W 6UW United Kingdom

Quantum chemical workflows can be built up within the science gateway MoSGrid (Molecular Simulation Grid). Complex workflows required by the endusers are dissected into smaller workflows which can be combined freely to larger meta-workflows. General quantum chemical workflows are described here as well as the real use case of a spectroscopic analysis resulting in an enduser desired meta-workflow. All workflow features are implemented via WS-PGRADE and submitted to UNICORE. The workflows are stored in the MoSGrid repository and ported to the SHIWA repository.

关键词： Quantum chemistry

来源：评论

学校读者我要写书评

暂无评论

Petri net distributability

Petri net distributability

引用

8th International Ershov Informatics Conference on Perspectives of System Informatics, PSI 2011

作者： Best, Eike Darondeau, Philippe Parallel Systems Department of Computing Science Carl von Ossietzky Universität Oldenburg Oldenburg D-26111 Germany INRIA Centre Rennes - Bretagne Atlantique Campus de Beaulieu Rennes Cedex F-35042 France

ISBN: (纸本)9783642297083

A Petri net is distributed if, given an allocation of transitions to (geographical) locations, no two transitions at different locations share a common input place. A system is distributable if there is some distributed Petri net implementing it. This paper addresses the question of which systems can be distributed, while respecting a given allocation. The paper states the problem formally and discusses several examples illuminating - to the best of the authors' knowledge - the current status of this work. © 2012 Springer-Verlag Berlin Heidelberg.

关键词： Petri nets

来源：评论

学校读者我要写书评

暂无评论

Assessment of two pressure-velocity coupling strategies for local meshless numerical method

引用

9th International Conference on Advances in Fluid Mechanics - Advances in Fluid Mechanics IX, AFM 2012

作者： Kosec, G. Vertnik, R. Šarler, B. Jožef Stefan Institute Laboratory for Parallel and Distributed Computing Slovenia University of Nova Gorica Laboratory for Multiphase Processes Slovenia Štore steel d.o.o. Research Slovenia Centre of Excellence for Biosensors Automation and Process Control Laboratory for Advanced Materials Systems Slovenia

ISBN: (纸本)9781845646004

The performance of two pressure-velocity coupling strategies, associated with the primitive variable solution of incompressible Newtonian fluid with the meshless Local Radial Basis Function Collocation Method (LRBFCM), is compared with respect to computational efficiency, stability, accuracy and spatial convergence. The LRBFCM is structured with multiquadrics on five noded support domains. The explicit time stepping is used. The Backward- Facing Step problem (BFS) has been selected as a benchmark problem, previously tackled by several numerical methods. The semi-local fractional step method (FSM) and completely local pressure-velocity couplings (LPVC) are compared. The numerical results are validated against previously published data. The results are represented and compared in terms of a convergence plot of the reattachment position. We show that both approaches provide reasonable results;however, LVPC is less computationally complex and less stable in comparison to FSM. © 2012 WIT Press.

关键词： Computational efficiency

来源：评论

学校读者我要写书评

暂无评论

Investigating volunteer computing for simul8: A feasibility study

Investigating volunteer computing for simul8: A feasibility ...

引用

2012 Operational Research Society Simulation Workshop, SW 2012

作者： Taylor, Simon J.E. Ghorbani, Mohammadmersin Kiss, Tamas Elder, Mark ICT Innovation Group Dept. of Information Systems and Computing Brunel University Uxbridge MiddlesexUB8 3PH United Kingdom Centre for Parallel Computing University of Westminster New Cavendish Street LondonW1W 6UW United Kingdom Simul8 Corporation 141 St. James' Road GlasgowG4 0LT United Kingdom

ISBN: (纸本)0903440504

Simulation software such as Simul8 is used to study complex systems in many areas. Experimentation can be time consuming. If a study requires many experiments, and each experiment requires multiple replications, then even with short run times the overall time to perform the study can be large. If models take longer to run, then this time can be excessive. Many organisations have commodity PCs that often remain idle or run applications that do not demand the processing power of a typical contemporary PC. Volunteer computing is a form of Desktop Grid computing that aims to use vast numbers of home computers to support computing applications. The SZTAKI Desktop Grid (SZDG) uses a modified form of the volunteer computing software BOINC to implement an institution-wide Desktop Grid. To investigate the feasibility of using Volunteer computing with Simul8, this paper reports on experiences of porting Simul8 to a SZDG.

关键词： Discrete event simulation

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：