检索结果-内蒙古大学图书馆

Simulating the Interaction of a Non-magnetized Planet with the Stellar Wind Produced by a Sun-like Star Using the flash code

引用

BRAZILIAN JOURNAL OF PHYSICS 2019年第5期49卷 678-692页

作者： Evangelista, Edgard F. D. Miranda, Oswaldo D. Mendes, Odim Domingues, Margarete O. INPE Div Astrofis Ave Astronautas 1758 BR-12227010 Sao Jose Dos Campos SP Brazil INPE Div Geofis Espacial Sao Jose Dos Campos Brazil INPE Labs Associados Computacao & Matemat Aplicada Sao Jose Dos Campos Brazil

The study of the interaction between solid objects and magnetohydrodynamic (MHD) fluids is of great importance in physics as a consequence of the significant phenomena generated, such as planets interacting with stellar wind produced by their host stars. There are several computational tools created to simulate hydrodynamic and MHD fluids, such as the flash code. In this code, there is a feature which permits the placement of rigid bodies in the domain to be simulated. However, it is available and tested for pure hydrodynamic cases only. Our aim here is to adapt the existing resources of flash to enable the placement of a rigid body in MHD scenarios and, with such a scheme, to produce the simulation of a non-magnetized planet interacting with the stellar wind produced by a sun-like star. Besides, we consider that the planet has no significant atmosphere. We focus our analysis on the patterns of the density, magnetic field, and velocity around the planet, as well as the influence of viscosity on such patterns. At last, an improved methodological approach is available to other interested users.

关键词： Stellar winds Magnetohydrodynamics flash code Numerical methods

来源：评论

学校读者我要写书评

暂无评论

flash code Utilizing Binary-Indexed Slice Encoding and Resizable-Clusters

引用

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2013年第12期E96A卷 2360-2367页

作者： Tan, Michael Joseph Kaji, Yuichi Nara Inst Sci & Technol Grad Sch Informat Sci Ikoma 6300192 Japan

Novel flash codes with small average write deficiency are proposed. A flash code is a coding scheme for avoiding the wearing of cells in flash memory. One approach to develop flash codes with large parameters is to make use of slices which are small groups of cells. Preliminary study shows that using small slices brings several favorable characteristics, but naive use of small slices induces a certain overhead. In this study, a new structure which is called a cluster is devised to develop a good slice-based flash code. Two different slice encoding schemes are used in a cluster, which decreases the overhead of using small slices while retaining its advantage. The proposed flash codes show much smaller write deficiency compared to another slice-based flash code.

关键词： flash code flash memory binary-indexed resizable-cluster method

来源：评论

学校读者我要写书评

暂无评论

Parallel Compressible Viscous Flow Simulations Using flash code: Implementation for Arbitrary 3D Geometries

引用

Procedia Engineering 2013年 61卷 52-56页

作者： Benzi John David R. Emerson Xiao-Jun Gu Scientific computing department STFC Daresbury Laboratory Warrington WA44AD United Kingdom

We implement computer graphics algorithms in the flash code to enable compressible high-speed flow simulation past any arbitrary two- and three-dimensional stationary bodies. The body shape is represented in a block-structured Cartesian adaptive mesh refinement grid. A high level of refinement is required to represent the body shape accurately and also resolve flow and shock features, resulting in very large grid sizes for 3D simulations. Simulations are done in parallel on IBM Blue Gene/Q computing system on which scalability of the code is also assessed. We also implement appropriate wall boundary conditions in flash to model viscous-wall effects. Navier- Stokes solutions for real applications like hypersonic flow control using micro vortex generators and flow past blunted cone-cylinder-flare geometry are shown.

关键词： flash code parallel Navier-Stokes micro vortex generator

来源：评论

学校读者我要写书评

暂无评论

Miniscribe :: Miniscribe 5.25 Inch Half Height Tech Support Manual Sep88

引用

2016年

Miniscribe :: Miniscribe 5.25 Inch Half Height Tech Support Manual Sep88 by published by

关键词： code controller current fixed disk dos dos partition drive error extended dos fdisk fdisk options fixed disk flash code format hard disk height low level manual miniscribe partition pin ribbon ribbon cable sep88 support

来源：评论

学校读者我要写书评

暂无评论

Parallel Navier-Stokes simulations for high speed compressible flow past arbitrary geometries using flash

引用

COMPUTERS & FLUIDS 2015年 110卷 27-35页

作者： John, Benzi Emerson, David R. Gu, Xiao-Jun STFC Daresbury Lab Dept Comp Sci Warrington WA4 4AD Cheshire England

We report extensions to the flash code to enable high-speed compressible viscous flow simulation past arbitrary two- and three-dimensional stationary bodies. The body shape is embedded in a block-structured Cartesian adaptive mesh refinement grid by implementing appropriate computer graphics algorithms. A high mesh refinement level is required for an accurate body shape representation which results in large grid sizes especially for three-dimensional simulations. Simulations are done in parallel on IBM Blue Gene/Q computing system on which the code performance has been assessed in both pure MPI and hybrid MPI-OpenMP modes. We also implement appropriate wall boundary conditions in flash to model viscous-wall effects. Navier-Stokes (NS) solutions for various two-dimensional test cases like a shock boundary layer interaction problem as well as for hypersonic flow past blunted cone-cylinder-flare and double-cone geometries are shown. Three dimensional NS simulations of micro vortex generators employed in hypersonic flow control have also been carried out and the computed results have been found to be consistent with experimental results. (C) 2014 Elsevier Ltd. All rights reserved.

关键词： flash code Navier-Stokes Hypersonic flow Parallel

来源：评论

学校读者我要写书评

暂无评论

The Software Development Process of flash, a Multiphysics Simulation code

The Software Development Process of FLASH, a Multiphysics Si...

引用

5th International Workshop on Software Engineering for Computational Science and Engineering (SE-CSE)

作者： Dubey, Anshu Antypas, Katie Calder, Alan Fryxell, Bruce Lamb, Don Ricker, Paul Reid, Lynn Riley, Katherine Rosner, Robert Siegel, Andrew Timmes, Francis Vladimirova, Natalia Weide, Klaus Univ Chicago Chicago IL 60637 USA Lawrence Berkeley Natl Lab Berkeley CA 94720 USA SUNY Stony Brook Stony Brook NY 11794 USA Univ Michigan Ann Arbor MI 48109 USA Univ Illinois Urbana IL 61801 USA Univ Western Australia Nedlands WA 6009 Australia Argonne Natl Lab Argonne IL 60439 USA Arizona State Univ Tempe AZ 85287 USA Univ New Mexico Albuquerque NM 87131 USA

ISBN: (纸本)9781467362610

The flash code has evolved into a modular and extensible scientific simulation software system over the decade of its existence. During this time it has been cumulatively used by over a thousand researchers in several scientific communities (i.e. astrophysics, cosmology, high-energy density physics, turbulence, fluid-structure interactions) to obtain results for research. The code started its life as an amalgamation of two already existing software packages and sections of other codes developed independently by various participating members of the team for other purposes. In the evolution process it has undergone four major revisions, three of which involved a significant architectural advancement. A corresponding evolution of the software process and policies for maintenance occurred simultaneously. The code is currently in its 4.x release with a substantial user community. Recently there has been an upsurge in the contributions by external users;some provide significant new capability. This paper outlines the software development and evolution processes that have contributed to the success of the flash code.

关键词： flash code community code software evolution adaptive mesh case study

来源：评论

学校读者我要写书评

暂无评论

The Expected Write Deficiency of Index-Less Indexed flash codes

引用

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2012年第12期E95A卷 2130-2138页

作者： Kaji, Yuichi Nara Inst Sci & Technol Grad Sch Informat Sci Ikoma 6300101 Japan

The expected write deficiency of the index-less indexed flash codes (ILIFC) is studied. ILIFC is a coding scheme for flash memory, and consists of two stages with different coding techniques. This study investigates the write deficiency of the first stage of ILIFC, and shows that omitting the second stage of ILIFC can be a practical option for realizing flash codes with good average performance. To discuss the expected write deficiency of ILIFC, a random walk model is introduced as a formalization of the behavior of ILIFC. Based on the random walk model, two different techniques are developed to estimate the expected write deficiency. One technique requires some computation, but gives very precise estimation of the write deficiency. The other technique gives a closed-form formula of the write deficiency under a certain asymptotic scenario.

关键词： flash code flash memory index-less indexed flash code random walk

来源：评论

学校读者我要写书评

暂无评论

Error-Correcting codes for flash Coding

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 2011年第9期57卷 6097-6108页

作者： Huang, Qin Lin, Shu Abdel-Ghaffar, Khaled A. S. Univ Calif Davis Dept Elect & Comp Engn Davis CA 95616 USA

flash memory is a nonvolatile computer storage device which consists of blocks of cells. While increasing the voltage level of a single cell is fast and simple, reducing the level of a cell requires the erasing of the entire block containing the cell. Since block-erasures are costly, flash coding schemes have been developed to maximize the number of writes before a block-erasure is needed. A novel coding scheme based on error-correcting codes is presented that allows the cell levels to increase as evenly as possible and as a result, increases the number of writes before a block-erasure. The scheme is based on the premise that cells whose levels are higher than others need not be increased. This introduces errors in the recorded data which can be corrected by an error-correcting code provided that the number of erroneous cells is within the error-correcting capability of the code. The scheme is also capable of combating noise, causing additional errors and erasures, in flash memories in order to enhance data reliability. For added flexibility, the scheme can be combined with other flash codes to yield concatenated schemes of high memory rates.

关键词： Block-erasure block-write concatenated code controllable error error-correcting code flash code memory rate WOM code

来源：评论

学校读者我要写书评

暂无评论

flash Coding Scheme Based on Error-Correcting codes

Flash Coding Scheme Based on Error-Correcting Codes

引用

IEEE Global Telecommunications Conference (GLOBECOM 2010)

作者： Huang, Qin Lin, Shu Abdel-Ghaffar, Khaled Univ Calif Davis Elect & Comp Engn Dept Davis CA 95616 USA

ISBN: (纸本)9781424456383

flash memory is a non-volatile computer storage device which consists of blocks of cells. While increasing the voltage level of a single cell is fast and simple, reducing the level of a cell requires the erasing of the entire block containing the cell. Since block erasures are costly, traditional flash coding schemes have been developed to maximize the number of writes before a block erasure is needed. A novel coding scheme based on error-correcting codes allows the cell levels to increase as evenly as possibly and as a result, increases the number of writes before a block erasure. The scheme is also capable of combating noise in flash memories in order to enhance data reliability.

关键词： Block-write block erasure controllable errors error-correcting code flash code

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：