Parallel computations of turbulent diffusion in convective boundary layers on shared-memory machines

Prasad Pai; Tate T.H. Tsang

doi:10.1016/0960-1686(92)90372-R

Parallel computations of turbulent diffusion in convective boundary layers on shared-memory machines

Prasad Pai, Tate T.H. Tsang

Chemical and Materials Engineering

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Currently, time-splitting finite difference or finite element schemes are commonly used in air-pollution modeling. In light of the recent advances in parallel processing, it is crucial to evaluate the performance of these time-splitting schemes on different multiprocessors. In this paper, we use a K-theory diffusion model and a second-order closure model to simulate turbulent diffusion in convective boundary layers. The objective is to assess the "portability" of time-splitting finite element schemes for shared-memory multiprocessors, such as IBM 3090-600J, the Alliant FX/8, the Sequent Symmetry S81 and the Encore Multimax. It was found that significant speed-ups were obtained as a result of parallelization with small programming efforts. Furthermore, our two- and three-dimensional results also suggest that second-order closure models are now computationally affordable and feasible for realistic air pollution modeling.

Original language	English
Pages (from-to)	2425-2435
Number of pages	11
Journal	Atmospheric Environment Part A, General Topics
Volume	26
Issue number	13
DOIs	https://doi.org/10.1016/0960-1686(92)90372-R
State	Published - Sep 1992

Bibliographical note

Funding Information:
Acknowledgements--This work was partially supported by the Center for Computational Sciences at the University of Kentucky and the U.S. Army Chemical Research and Development Engineering Center. Computations were performed at the University of Kentucky, Comell National Supercomputing Facility and the Advanced Computing Resources Facility, Mathematics and Computer Sciences Division, Argonne National Laboratory.

Keywords

K-theory diffusion model
Turbulent diffusion
convective boundary layer
parallelization
second-order closure model
time-splitting finite element

ASJC Scopus subject areas

Pollution

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10.1016/0960-1686(92)90372-R

Cite this

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title = "Parallel computations of turbulent diffusion in convective boundary layers on shared-memory machines",

abstract = "Currently, time-splitting finite difference or finite element schemes are commonly used in air-pollution modeling. In light of the recent advances in parallel processing, it is crucial to evaluate the performance of these time-splitting schemes on different multiprocessors. In this paper, we use a K-theory diffusion model and a second-order closure model to simulate turbulent diffusion in convective boundary layers. The objective is to assess the {"}portability{"} of time-splitting finite element schemes for shared-memory multiprocessors, such as IBM 3090-600J, the Alliant FX/8, the Sequent Symmetry S81 and the Encore Multimax. It was found that significant speed-ups were obtained as a result of parallelization with small programming efforts. Furthermore, our two- and three-dimensional results also suggest that second-order closure models are now computationally affordable and feasible for realistic air pollution modeling.",

keywords = "K-theory diffusion model, Turbulent diffusion, convective boundary layer, parallelization, second-order closure model, time-splitting finite element",

author = "Prasad Pai and Tsang, {Tate T.H.}",

note = "Funding Information: Acknowledgements--This work was partially supported by the Center for Computational Sciences at the University of Kentucky and the U.S. Army Chemical Research and Development Engineering Center. Computations were performed at the University of Kentucky, Comell National Supercomputing Facility and the Advanced Computing Resources Facility, Mathematics and Computer Sciences Division, Argonne National Laboratory.",

year = "1992",

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AU - Tsang, Tate T.H.

N1 - Funding Information: Acknowledgements--This work was partially supported by the Center for Computational Sciences at the University of Kentucky and the U.S. Army Chemical Research and Development Engineering Center. Computations were performed at the University of Kentucky, Comell National Supercomputing Facility and the Advanced Computing Resources Facility, Mathematics and Computer Sciences Division, Argonne National Laboratory.

PY - 1992/9

Y1 - 1992/9

N2 - Currently, time-splitting finite difference or finite element schemes are commonly used in air-pollution modeling. In light of the recent advances in parallel processing, it is crucial to evaluate the performance of these time-splitting schemes on different multiprocessors. In this paper, we use a K-theory diffusion model and a second-order closure model to simulate turbulent diffusion in convective boundary layers. The objective is to assess the "portability" of time-splitting finite element schemes for shared-memory multiprocessors, such as IBM 3090-600J, the Alliant FX/8, the Sequent Symmetry S81 and the Encore Multimax. It was found that significant speed-ups were obtained as a result of parallelization with small programming efforts. Furthermore, our two- and three-dimensional results also suggest that second-order closure models are now computationally affordable and feasible for realistic air pollution modeling.

AB - Currently, time-splitting finite difference or finite element schemes are commonly used in air-pollution modeling. In light of the recent advances in parallel processing, it is crucial to evaluate the performance of these time-splitting schemes on different multiprocessors. In this paper, we use a K-theory diffusion model and a second-order closure model to simulate turbulent diffusion in convective boundary layers. The objective is to assess the "portability" of time-splitting finite element schemes for shared-memory multiprocessors, such as IBM 3090-600J, the Alliant FX/8, the Sequent Symmetry S81 and the Encore Multimax. It was found that significant speed-ups were obtained as a result of parallelization with small programming efforts. Furthermore, our two- and three-dimensional results also suggest that second-order closure models are now computationally affordable and feasible for realistic air pollution modeling.

KW - K-theory diffusion model

KW - Turbulent diffusion

KW - convective boundary layer

KW - parallelization

KW - second-order closure model

KW - time-splitting finite element

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JO - Atmospheric Environment Part A, General Topics

JF - Atmospheric Environment Part A, General Topics

IS - 13

ER -

Parallel computations of turbulent diffusion in convective boundary layers on shared-memory machines

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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