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The Optimal Radius of the Support of Radial Weights Used in Moving Least Squares Approximation

Y.F. Nie1,2, S.N. Atluri2, C.W. Zuo1
School of Science, Northwestern Polytechnical University, Xi’an 710072, China. E-mail: Yfnie@nwpu.edu.cn
Center for Aerospace Research & Education, University of California at Irvine, Irvine, CA 92697, USA

Computer Modeling in Engineering & Sciences 2006, 12(2), 137-148. https://doi.org/10.3970/cmes.2006.012.137

Abstract

Owing to the meshless and local characteristics, moving least squares (MLS) methods have been used extensively to approximate the unknown function of partial differential equation initial boundary value problem. In this paper, based on matrix analysis, a sufficient and necessary condition for the existence of inverse of coefficient matrix used in MLS methods is developed firstly. Then in the light of approximate theory, a practical mathematics model is posed to obtain the optimal radius of support of radial weights used in MLS methods. As an example, while uniform distributed particles and the 4th order spline weight function are adopted in MLS method in two dimension domain and two kinds of norms are used to measure error, optimal results for linear and quadratic basis are gained. Finally, the test data verify that the optimal values are correct. The research idea can be used in 3-dimension problems too.

Keywords

MLS methods, Radius of support, Scaling, Sobolev norm, Mathematics model, Matrix analysis, Approximate theory.

Cite This Article

Nie, Y., Atluri, S., Zuo, C. (2006). The Optimal Radius of the Support of Radial Weights Used in Moving Least Squares Approximation. CMES-Computer Modeling in Engineering & Sciences, 12(2), 137–148.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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