Parallel Algorithms for Particles–Turbulence Two-Way Interaction Direct Numerical Simulation

Ling, Wei; Liu, J.; Chung, J. N.; Crowe, C. T.

doi:10.1006/jpdc.2001.1781

Cited by 5 publications

(6 citation statements)

References 28 publications

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“…It is worth mentioning that 4096 2 equals to 256 3 , which means PTF might be faster than PFFT for intermediate resolution of 3D simulation on about 100 processors. This observation is different from the conclusion in [16]. From the speedup plots in lower resolutions (64 2 -1024 2 ) of pseudo-spectral codes on DeepComp 1800, we can draw roughly the same conclusions as those in Section 2.3 and 3.2, which will not be discussed here to make the paper concise.…”

Section: Some Extended Studies Of Ptfcontrasting

confidence: 41%

“…see [6,7], and a review paper [8]). The parallel schemes based on spectral methods have also been intensively investigated over the last decade-mainly for three-dimensional (3D) problems [9,10,11,12,13,14,15,16]. The main computation time for spectral methods is concentrated in the part of the Fast Fourier Transform (FFT), around which the 3D parallel schemes are constructed.…”

Section: Introductionmentioning

confidence: 99%

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A new parallel strategy for two-dimensional incompressible flow simulations using pseudo-spectral methods

Yin

Tang

2005

Journal of Computational Physics

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A novel parallel technique for Fourier-Galerkin pseudo-spectral methods with applications to two-dimensional Navier-Stokes equations and inviscid Boussinesq approximation equations is presented. It takes advantage of the programming structure of the phase-shift de-aliased scheme for pseudo-spectral codes, and combines the task-distribution strategy [Z. Yin, H.J.H. Clercx, D.C. Montgomery, An easily implemented task-based parallel scheme for the Fourier pseudo-spectral solver applied to 2D Navier-Stokes turbulence, Comput. Fluid 33 (2004) 509] and parallelized Fast Fourier Transform scheme. The performances of the resulting MPI Fortran90 codes with the new procedure on SGI 3800 are reported. For fixed resolution of the same problem, the peak speed of the new scheme can be twice as fast as the old parallel methods. The parallelized codes are used to solve some challenging numerical problems governed by the Navier-Stokes equations and the Boussinesq equations. Two interesting physical problems, namely, the double-valued x-w structure in two-dimensional decaying turbulence and the collapse of the bubble cap in the Boussinesq simulation, are solved by using the proposed parallel algorithms.

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Section: Some Extended Studies Of Ptfcontrasting

confidence: 41%

Section: Introductionmentioning

confidence: 99%

A new parallel strategy for two-dimensional incompressible flow simulations using pseudo-spectral methods

Yin

Tang

2005

Journal of Computational Physics

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“…In general, there are at least two activities that need to be specified for a master process: sending data and receiving results of computation. To illustrate this approach, the algorithm used in a simulation experiment presented in [8] is employed. Using filmification, there are at least six (6) scenes that comprise the whole computation process using the master/slave scheme given in [8].…”

Section: Specifying Message-passing Type Of Communicationmentioning

confidence: 99%

“…To illustrate this approach, the algorithm used in a simulation experiment presented in [8] is employed. Using filmification, there are at least six (6) scenes that comprise the whole computation process using the master/slave scheme given in [8]. These scenes are: 1) scattering data (Z-slices) to slaves, 2) doing some computations by the slaves, 3) gathering the results from slaves, 4) scattering data (Y-slices) to slaves, 5) doing some computation by the slaves, and 6) gathering data from slaves.…”

Section: Specifying Message-passing Type Of Communicationmentioning

confidence: 99%

A visual approach to specifying message-passing operations

Roxas

Mirenkov

2003 International Conference on Parallel Processing Workshops, 2003. Proceedings.

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Visual programming is a very promising approach for parallel programming because of the complexity in making parallel programs. There were several attempts to provide a visual environment for making parallel programs but only achieved a limited success. The commonly used technique is to draw some graphs whose nodes represent modules and arcs represent some communication paths. The graphs are then annotated by attaching some conventional programming codes. In practice, this approach can be useful but in a limited number of cases. To improve the situation, a new visual programming environment is being developed that allows the creation of programs from algorithmic "film" specifications with a minimal use of text in making programs. In this environment, there are six different groups of frames for the programmer to watch, edit, and specify operations. One of them is for specifiying I/O operations and communication between software components in a complex program. Specifying communications among processes in a parallel program is just a partial case in this subsystem. This paper presents a visual environment for specifying communication among processes in a parallel program using a language of micro-icons. As an example, the scatter and gather types of collective communication are presented based on the master/slave scheme of computation. These examples show how to define message-passing communication without using text-based programming style.

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“…Na formulação Euler-Langrange aplica-se a segunda lei de Newton a cada partícula individualmente do escoamento, enquanto a fase contínuaé descrita a partir das equações conservativas do meio contínuo. Para fases contínuas,é comum a aplicação de simulação RANS (Reynolds Average Navier-Stokes Simulation) ou DNS/LES (Direct Numeric Simulation/Large-Eddy Simulations), [18], [23], [45], [46], [50], [67], [76], [90].…”

Section: Formulação Euler-langrangeunclassified

Simulação numérica euleriana de escoamento gás-sólido em riser com dimensões reduzidas aplicando malhas refinadas

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AgradecimentosAgradeço ao meu orientador Professor Dr. Fernando E. Milioli, pela oportunidade, pela confiança e por todo suporte dado na realização deste trabalho. Ao Professor Dr. Valdemir G. Ferreira, pela amizade e discussões ao longo do desenvolvimento desse projeto. Ao Professor Dr. Luben C. Gómez, pelas importantes colaborações no início desse projeto. Ao Jorge Nicolau, pelo auxílio no entendimento e instalação de programas necessários para as simulações. Ao Robreto Prata, pela suporte dado na manutenção dos microcomputadores. A minha noiva Monica R. Gaiotto, por todo amor, carinho, compreensão e incentivos em todos os momentos.À todos os seus familiares e, principalmente,à sua Mãe Nadir B. Gaiotto e irmão Charles B. Gaitto, pelo incentivo. Aos amigos de São Carlos, pela amizade e momentos de descontração. Ao Cássio Oishi, por aceitar dividir seu quarto para minha estada em São Carlos. Aos demais amigos, por todo incentivo. Minha sincera gratidão ao meus familiares, por toda ajuda e apoio dados ao longo da minha carreira acadêmica.À minha Mãe Anália E. dos Santos e em memórias do meu Pai Domingos P. dos Santos e irmão Domingos L. dos Santos. Dedico este trabalhosà todos eles.A agência CAPES, pelo suporte financeiro para o desenvolvimento deste projeto.

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Parallel Algorithms for Particles–Turbulence Two-Way Interaction Direct Numerical Simulation

Cited by 5 publications

References 28 publications

A new parallel strategy for two-dimensional incompressible flow simulations using pseudo-spectral methods

A new parallel strategy for two-dimensional incompressible flow simulations using pseudo-spectral methods

A visual approach to specifying message-passing operations

Simulação numérica euleriana de escoamento gás-sólido em riser com dimensões reduzidas aplicando malhas refinadas

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