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Research Papers

A Simulation of Domain Decomposition Method for Smoothed Particle Hydrodynamics

[+] Author and Article Information
Taehyo Park

Professor
Computational Solid and Structural
Mechanics Laboratory,
Department of Civil and Environmental
Engineering,
Hanyang University,
222 Wangsimni-ro,
Seongdong-gu, Seoul 04763, South Korea
e-mail: cepark@hanyang.ac.kr

Shengjie Li

Computational Solid and Structural Mechanics
Laboratory,
Department of Civil and Environmental
Engineering,
Hanyang University,
222 Wangsimni-ro,
Seongdong-gu, Seoul 04763, South Korea
e-mail: lee901127@hanyang.ac.kr

Mina Lee

KORAIL,
240 Jungangno,
Dong-gu, Daejeon 34618, South Korea
e-mail: minalee413@naver.com

Moonho Tak

Computational Solid and Structural Mechanics
Laboratory,
Department of Civil and Environmental
Engineering,
Hanyang University,
222 Wangsimni-ro,
Seongdong-gu, Seoul 04763, South Korea
e-mail: pivotman@hanyang.ac.kr

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 1, 2016; final manuscript received November 2, 2016; published online February 7, 2017. Assoc. Editor: Xi Chen.

J. Eng. Mater. Technol 139(2), 021010 (Feb 07, 2017) (7 pages) Paper No: MATS-16-1163; doi: 10.1115/1.4035486 History: Received June 01, 2016; Revised November 02, 2016

Nowadays, the numerical method has become a very important approach for solving complex problems in engineering and science. Some grid-based methods such as the finite difference method (FDM) and finite element method (FEM) have already been widely applied to various areas; however, they still suffer from inherent difficulties which limit their applications to many problems. Therefore, a strong interest is focused on the meshfree methods such as smoothed particle hydrodynamics (SPH) to simulate fluid flow recently due to the advantages in dealing with some complicated problems. In the SPH method, a great number of particles will be used because the whole domain is represented by a set of arbitrarily distributed particles. To improve the numerical efficiency, parallelization using message-passing interface (MPI) is applied to the problems with the large computational domain. In parallel computing, the whole domain is decomposed by the parallel method for continuity of subdomain boundary under the single instruction multiple data (SIMD) and also based on the procedure of the SPH computations. In this work, a new scheme of parallel computing is employed into the SPH method to analyze SPH particle fluid. In this scheme, the whole domain is decomposed into subdomains under the SIMD process and it composes the boundary conditions to the interface particles which will improve the detection of neighbor particles near the boundary. With the method of parallel computing, the SPH method is to be more flexible and perform better.

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References

Figures

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Fig. 1

Domain decomposition with ghost zone

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Fig. 2

Domain decomposition with interface particle: (a) problem domain and (b) separated subdomains

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Fig. 3

Filtering the particles: (a) step 1 and (b) step 2

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Fig. 4

Domain decomposition

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Fig. 5

Domain decomposition using two CPUs on 768 particles: (a) at time 0 s, (b) at time 0.01 s, (c) at time 0.03 s, (d) at time 0.05 s, (e) at time 0.07 s, and (f) at time 0.9 s

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Fig. 6

Execution time in two cases: (a) 768 particles, (b) 1448 particles, (c) 2208 particles, (d) 2928 particles, and (e) 3648 particles

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Fig. 7

Number of iteration in two cases: (a) 768 particles, (b) 1448 particles, (c) 2208 particles, (d) 2928 particles, and (e) 3648 particles

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