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  • 1
    Electronic Resource
    Electronic Resource
    An Evaluation of Architectural Platforms for Parallel Navier-Stokes Computations (1997)
    Springer
    The journal of supercomputing 11 (1997), S. 41-60 
    Details
    ISSN: 1573-0484
    Keywords: Computational fluid dynamics ; Navier-Stokes and Euler equations ; computation and communication ; scalability ; shared memory ; distributed memory ; network of workstations ; interconnection network ; message-passing library
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract We study the computational, communication, and scalability characteristics of a computational fluid dynamics application, which solves the time-accurate flow field of a jet using the compressible Navier-Stokes equations, on a variety of parallel architectural platforms. The platforms chosen for this study are a cluster of workstations (the LACE experimental testbed at NASA Lewis), a shared-memory multiprocessor (the CRAY Y-MP), and distributed-memory multiprocessors with different topologies (the IBM SP and the CRAY T3D). We investigate the impact of various networks connecting the cluster of workstations on the performance of the application and the overheads induced by popular message-passing libraries used for parallelization. The work also highlights the importance of matching the memory bandwidth to processor speed for good single processor performance. By studying the performance of an application on a variety of architectures, we are able to point out the strengths and weaknesses of each of the example computing platforms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007961312671
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Suspended particulate matter and dynamics of the Mfolozi estuary, Kwazulu-Natal: Implications for environmental management (1996)
    Springer
    Environmental geology 28 (1996), S. 40-51 
    Details
    ISSN: 1432-0495
    Keywords: Key words Mfolozi Estuary ; Suspended particulate matter ; Shear stress ; Density fronts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The Mfolozi Estuary on the KwaZulu-Natal coast of South Africa is the most turbid estuary in Natal due to poor catchment management, leading to large quantities of suspended particulate matter (SPM) entering the estuary from the Mfolozi River. This paper quantities some of the solute and sediment dynamics in the Mfolozi Estuary where the main documented environmental concern is the periodic input of SPM from the Mfolozi Estuary to the St. Lucia system, causing reduction of light penetration and endangering biological productivity in this important nature reserve. Synoptic water level results have allowed reach mean bed shear stresses and velocities to be calculated for an observed neap tidal cycle. Results indicate that ebb velocities dominate the sediment transport processes in the estuary when fluvial input in the Mfolozi River is of the order of 15–20 m3 s–1. Observed and predicted flood tide velocities are too low (〈0.35 m s–1) to suspend and transport significant amounts of SPM. Observed results indicate that although the SPM load entering the estuary is dominantly from the Mfolozi River, the Msunduzi River flow plays a major role in the composition of the estuary's salinity and velocity fields. It is calculated that the Mfolozi Estuary would fill with sediment in 1.3 years if it was cut off from the sea. The major fluvial flood events help maintain the estuary by periodically pushing sediment seawards (spit progrades seawards 5 m yr–1) and scouring and maintaining the main flow channel in the estuary. During low fluvial flow conditions, tidal flow velocities will become the dominant control on sediment transport in the estuary. Interchange of SPM between the St. Lucia and Mfolozi estuaries under present conditions is complicated by the strong transverse velocity shear between the two systems at their combined mouth. This is creating a salinity-maintained axial convergence front that suppresses mixing of solutes and SPM between the systems for up to 10 h of the tidal cycle during observed conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002540050077
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Suspended particulate matter and dynamics of the Mfolozi estuary, Kwazulu-Natal: Implications for environmental management (1996)
    Springer
    Details
    Publication Date: 1996-07-29
    Print ISSN: 0943-0105
    Electronic ISSN: 1432-0495
    Topics: Geosciences
    Published by Springer
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    PAPER CURRENT
  • 4
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    An Evaluation of Architectural Platforms for Parallel Navier-Stokes Computations (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: We study the computational, communication, and scalability characteristics of a computational fluid dynamics application, which solves the time accurate flow field of a jet using the compressible Navier-Stokes equations, on a variety of parallel architecture platforms. The platforms chosen for this study are a cluster of workstations (the LACE experimental testbed at NASA Lewis), a shared memory multiprocessor (the Cray YMP), and distributed memory multiprocessors with different topologies - the IBM SP and the Cray T3D. We investigate the impact of various networks connecting the cluster of workstations on the performance of the application and the overheads induced by popular message passing libraries used for parallelization. The work also highlights the importance of matching the memory bandwidth to the processor speed for good single processor performance. By studying the performance of an application on a variety of architectures, we are able to point out the strengths and weaknesses of each of the example computing platforms.
    Keywords: Computer Programming and Software
    Type: NASA-CR-198308 , NAS 1.26:198308 , ICASE-96-22
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Parallelizing Navier-Stokes Computations on a Variety of Architectural Platforms (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: We study the computational, communication, and scalability characteristics of a Computational Fluid Dynamics application, which solves the time accurate flow field of a jet using the compressible Navier-Stokes equations, on a variety of parallel architectural platforms. The platforms chosen for this study are a cluster of workstations (the LACE experimental testbed at NASA Lewis), a shared memory multiprocessor (the Cray YMP), distributed memory multiprocessors with different topologies-the IBM SP and the Cray T3D. We investigate the impact of various networks, connecting the cluster of workstations, on the performance of the application and the overheads induced by popular message passing libraries used for parallelization. The work also highlights the importance of matching the memory bandwidth to the processor speed for good single processor performance. By studying the performance of an application on a variety of architectures, we are able to point out the strengths and weaknesses of each of the example computing platforms.
    Keywords: Numerical Analysis
    Type: NASA-TM-113158 , NAS 1.15:113158 , E-10908 , ICOMP-97-12 , Supercomputing 1995; Dec 03, 1995 - Dec 08, 1995; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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