Stability analysis of RBF-FD and WLS based local strong form meshless methods on scattered nodes

Abstract

The popularity of local meshless methods in the field of numerical simulations has increased greatly in recent years. This is mainly due to the fact that they can operate on scattered nodes and that they allow a direct control over the approximation order and basis functions. In this paper we analyse two popular variants of local strong form meshless methods, namely the radial basis function-generated finite differences (RBF-FD) using polyharmonic splines (PHS) augmented with monomials, and the weighted least squares (WLS) approach using only monomials. Our analysis focuses on the accuracy and stability of the numerical solution computed on scattered nodes in a two- and three-dimensional domain. We show that while the WLS variant is a better choice when lower order approximations are sufficient, the RBF-FD variant exhibits a more stable behavior and a higher accuracy of the numerical solution for higher order approximations, but at the cost of higher computational complexity.

arXiv commentMipro conference paper

References in corpus (6)

• On generation of node distributions for meshless PDE discretizations
• Adaptive Radial Basis Function-generated Finite Differences method for contact problems
• Medusa: A C++ Library for solving PDEs using Strong Form Mesh-Free methods
• Monomial augmentation guidelines for RBF-FD from accuracy vs. computational time perspective
• Refined Meshless Local Strong Form solution of Cauchy-Navier equation on an irregular domain
• p-refined RBF-FD solution of a Poisson problem