doi:10.1016/S0168-874X(02)00090-2
Copyright © 2002 Elsevier Science B.V. All rights reserved.
Characteristics of semi- and full discretization of stabilized Galerkin meshfree method
Yang Youa, Jiun-Shyan Chen
,
, 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
Fig. 1. Two-dimensional Voronoi diagram.
Fig. 2. Comparison of normalized phase speed using consistent mass in wave equation.
Fig. 3. Comparison of normalized phase speed using lumped mass in wave equation.
Fig. 4. Comparison of normalized diffusivity using consistent capacity in heat equation.
Fig. 5. Comparison of normalized diffusivity using lumped capacity in heat equation.
Fig. 6. Solution to Helmholtz equations with lumped mass.
Fig. 7. Solution to Helmholtz equations with consistent mass.
Fig. 8. Elastic bar impacting onto a rigid wall.
Fig. 9. Nonuniform particle distribution for lumped mass with explicit time integration.
Fig. 10. Solution to wave equation with nonuniform discretization and explicit time integration.
Fig. 11. Nonuniform particle distribution for consistent mass with implicit time integration.
Fig. 12. Solution to wave equation with nonuniform discretization and implicit time integration.
Fig. 13. Solution to heat equation with lumped capacity matrix.
Fig. 14. Solution to heat equation with consistent capacity matrix.