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Finite Elements in Analysis and Design
Volume 38, Issue 10, August 2002, Pages 999-1012
 
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doi:10.1016/S0168-874X(02)00090-2    How to Cite or Link Using DOI (Opens New Window)
Copyright © 2002 Elsevier Science B.V. All rights reserved.

Characteristics of semi- and full discretization of stabilized Galerkin meshfree method

Yang Youa, Jiun-Shyan ChenCorresponding Author Contact Information, E-mail The Corresponding Author, a and Thomas E. Vothb, 1

a Department of Civil & Environmental Engineering, University of California, Los Angeles, 5731G Boelter Hall, Los Angeles, CA, 90095-1593, USA b Thermal Science Department, Sandia National Laboratories, M/S 0819, P.O. Box 5800, Albuquerque, NM, 87185-0819, USA

Available online 29 March 2002.

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Abstract

Stabilized conforming nodal integration (SCNI) has been developed to enhance computational efficiency of Galerkin meshfree methods. This paper employs von Neumann analyses to study the spatial semi-discretization of Galerkin meshfree methods using SCNI. Two model problems were presented with respect to the normalized phase speed and group speed for the wave equation, and normalized diffusivity for the heat equation. Both consistent and lumped mass (capacity) discretizations are considered in the study. The transient properties in the full discretization of the two model problems were also analyzed. The results show superior dispersion behavior in meshfree methods integrated by SCNI compared to the Gauss integration when consistent mass (capacity) matrix is employed in the discretization. For the lumped mass case, SCNI performance is comparable to that of the Gauss integration, but exhibits considerable reduction of computational time.

Author Keywords: Stabilized conforming nodal integration; Meshfree methods; Reproducing kernel particle method; Discretization error

Article Outline

1. Introduction
2. Meshfree approximation and stabilized conforming nodal integration
2.1. Meshfree approximation
2.2. Stabilized conforming nodal integration
3. von Neumann dispersion analysis
3.1. Second-order wave equation
3.2. Heat equation
3.3. von Neumann analysis for meshfree methods
3.4. Helmholtz equation
4. Full discretization
4.1. One-dimension wave equation
4.2. One-dimension heat equation
5. Conclusion
Acknowledgements
References















 
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