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  • 1
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    Models of Thermal Relaxation Mechanics for Particle Simulation Methods (1993)
    Elsevier
    Details
    Publication Date: 1993-08-01
    Print ISSN: 0021-9991
    Electronic ISSN: 1090-2716
    Topics: Computer Science , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Experience in using SIMD and MIMD parallelism for computational fluid dynamics (1993)
    Elsevier
    Details
    Publication Date: 1993-07-01
    Print ISSN: 0168-9274
    Electronic ISSN: 1873-5460
    Topics: Mathematics
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    Automatic partitioning of unstructured grids into connected components (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents two partitioning schemes that guarantee connected components given a connected initial grid. Connected components are important for convergence of methods such as domain decomposition or multigrid. For many of the grids tested, the schemes produce partitions as good (in terms of number of cut edges) or better than spectral partitioning and require only modest computational resources. This paper describes the two schemes in detail and presents comparison results from a number of two and three dimensional unstructured grids.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: NAS 2-12961 , ; : Advances in Optica
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Lip leakage flow simulation for the Gravity Probe B gas spinup (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The lip leakage flow for the Gravity Probe B (GP-B) gas spinup system is investigated using a particle simulation code on the Connection Machine (PSiCM). Particle simulation is employed because the flow conditions are in the transition regime between continuum and free molecule where particle methods are of greatest use. The dominant flow is Couette in nature and the simulation is first validated through comparison to theoretical results for Couette flow in the transition regime. A GP-B type geometry is then simulated and results are presented for two conditions, those corresponding to near the inlet and near the outlet of the spinup channel. Comparison to experiment is not made because experimental data is not yet available.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 92-0559
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Three dimensional particle simulation of high altitude rocket plumes (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The interaction of two nozzles exhausting into vacuum generates a complex three-dimensional shock structure. The shock structure and resulting plume flowfield is characterized by the nozzle separation distance. For the appropriate range of penetration Knudsen numbers, the analysis of this shock structure can be suitably accomplished through a Monte Carlo simulation. This paper describes the application of a general three-dimensional Monte Carlo simulation on the Connection Machine CM-2 to the analysis of the plume self-interaction shock in the near field. Results are presented for two cases, corresponding to a small and a large nozzle separation distance. The results correctly reproduce the expected flow features and demonstrate the ability of this method to properly simulate the start of the plume self-interaction shock. This has significance not only for allowing analysis of the self-interacting plume in the near field, but also for allowing the subsequent simulation of the far field flow through the use of a continuation downstream exit boundary.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: AIAA PAPER 92-2913
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Implementation of a hypersonic rarefied flow particle simulation on the Connection Machine (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A very efficient direct particle simulation algorithm for hypersonic rarefied flows is presented and its implmentation on a Connection Machine is described. The implementation simulates ideal diatomic Maxwell molecules with three translational and two rotational degrees of freedom. Results for a 2-D simulation of supersonic flow over a 30 deg wedge are presented and used for validation.
    Keywords: AERODYNAMICS
    Type: NASA-CR-185428 , NAS 1.26:185428 , RIACS-TR-88.46
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    A fast sorting algorithm for a hypersonic rarefied flow particle simulation on the connection machine (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The data parallel implementation of a particle simulation for hypersonic rarefied flow described by Dagum associates a single parallel data element with each particle in the simulation. The simulated space is divided into discrete regions called cells containing a variable and constantly changing number of particles. The implementation requires a global sort of the parallel data elements so as to arrange them in an order that allows immediate access to the information associated with cells in the simulation. Described here is a very fast algorithm for performing the necessary ranking of the parallel data elements. The performance of the new algorithm is compared with that of the microcoded instruction for ranking on the Connection Machine.
    Keywords: AERODYNAMICS
    Type: NASA-CR-188903 , NAS 1.26:188903 , RIACS-TR-89-44
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Three-dimensional direct particle simulation on the Connection Machine (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents the algorithms necessary for an efficient data parallel implementation of a 3D particle simulation. In particular, a general master/slave algorithm and a fast sorting algorithm are described and the use of these algorithms in a particle simulation is outlined. A particle simulation using these algorithms has been implemented on a 32768 processor Connection Machine that is capable of simulating over 30 million particles at an average rate of 2.4-microsec/particle/step. Results are presented from the simulation of flow over an Aeroassisted Flight Experiment geometry at 100 km altitude.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: AIAA PAPER 91-1365
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Data parallel sorting for particle simulation (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Sorting on a parallel architecture is a communications intensive event which can incur a high penalty in applications where it is required. In the case of particle simulation, only integer sorting is necessary, and sequential implementations easily attain the minimum performance bound of O (N) for N particles. Parallel implementations, however, have to cope with the parallel sorting problem which, in addition to incurring a heavy communications cost, can make the minimun performance bound difficult to attain. This paper demonstrates how the sorting problem in a particle simulation can be reduced to a merging problem, and describes an efficient data parallel algorithm to solve this merging problem in a particle simulation. The new algorithm is shown to be optimal under conditions usual for particle simulation, and its fieldwise implementation on the Connection Machine is analyzed in detail. The new algorithm is about four times faster than a fieldwise implementation of radix sort on the Connection Machine.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Concurrency: Practice and Experience (ISSN 1040-3108); 4; 3; p. 241-255
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Experience in using SIMD and MIMD parallelism for computational fluid dynamics (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: One of the key objectives of the Applied Research Branch in the Numerical Aerodynamic Simulation (NAS) Systems Division at NASA Ames Research Center is the accelerated introduction of highly parallel machines into a fully operational environment. In this report we summarize some of the experiences with the parallel testbed machines at the NAS Applied Research Branch. We discuss the performance results obtained from the implementation of two computational fluid dynamics (CFD) applications, an unstructured grid solver and a particle simulation, on the Connection Machine CM-2 and the Intel iPSC/860.
    Keywords: COMPUTER OPERATIONS AND HARDWARE
    Type: NAS 2-12961 , Applied Numerical Mathematics (ISSN 0168-9274); p. 431-442
    Format: text
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