Parallel FEM-DDM with BD-SGS Preconditioner for 3D Scattering by Large Inhomogeneous Objects

2019 ◽  
Author(s):  
Rui-Qing Liu ◽  
Ming-Lin Yang ◽  
Hong-Wei Gao ◽  
Xin-Qing Sheng
Keyword(s):  
Parallel Fem

A Domain Decomposition Study for a Parallel Finite Element Code

1992 ◽  
Author(s):  
J. Rodriguez ◽  
J. Sun
Keyword(s):  
Finite Element ◽  
Domain Decomposition ◽  
Performance Criteria ◽  
Communication Overhead ◽  
Decomposition Algorithms ◽  
System Matrix ◽  
Single Wave ◽  
Parallel Finite Element ◽  
Computational Structural Mechanics ◽  
Parallel Fem

Abstract The primary objective of this study was the implementation and comparison of domain decomposition algorithms for a parallel Finite Element Method (FEM) used in the area of Computational Structural Mechanics (CSM). A parallelized FEM code exploits the concurrency inherent in the method to improve its computational efficiency. In order to use a larger size granularity in the parallel computation, the parallel FEM needs to partition its domain into subdomains in a proper manner. It is therefore necessary to search for domain decomposition algorithms to satisfy the special requirements of a parallel FEM. The domain decomposition algorithms investigated in this study physically decompose a meshed domain into a desired number of subdomains. Addressing the requirements of the parallel FEM, these algorithms are able to handle any type of two- and three-dimensional domains, balance the workloads across the multiple processors, minimize the communication overhead among the processors, maintain the integrity of each subdomain, minimize the overall bandwidth of the resulting system matrix, and require only a small amount of CPU time for the decomposition. Modifications to existing decomposition algorithms, such as the single wave propagating method and the bisecting method using vertical/horizontal cuts, are investigated. A new algorithm, based on the proposed multiple wave propagating method and the bisecting method using middle cuts, is formulated. These algorithms are compared with each other using performance criteria based on the overall FEM code and the algorithms themselves. An optimal combination algorithm is proposed. This algorithm combination is flexible and intelligent in some sense since several judgements are suggested to guide and organize different decompositions based on the general geometry of the meshes. The combination algorithm possesses both the desirable features of wave propagating and bisecting methods. As an application, the present algorithm is included in an existing parallel FEM code and some improvements in this code are made. The overall efficiency of the FEM code was increased.

Large scale parallel FEM computations of far/near stress field changes in rocks

2006 ◽  
Vol 22 (4) ◽  
pp. 449-459 ◽  
Author(s):  
R. Blaheta ◽  
P. Byczanski ◽  
O. Jakl ◽  
R. Kohut ◽  
A. Kolcun ◽  
...  
Keyword(s):  
Stress Field ◽  
Large Scale ◽  
Parallel Fem

GeoFEM: High-performance parallel FEM for geophysical applications

1999 ◽  
pp. 292-303 ◽  
Author(s):  
Mikio Iizuka ◽  
Hisashi Nakamura ◽  
Kazuteru Garatani ◽  
Kengo Nkajima ◽  
Hiroshi Okuda ◽  
...  
Keyword(s):  
High Performance ◽  
Parallel Fem
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