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Solution of the 3D Helmholtz equation using barycentric Lagrange interpolation collocation method

Miaomiao Yang (Institute of Applied Mathematics and Mechanics, Ningxia University, Yinchuan, China)
Xinkun Du (Center for Composite Materials, Harbin Institute of Technology, Harbin, China)
Yongbin Ge (Institute of Applied Mathematics and Mechanics, Ningxia University, Yinchuan, China)

Engineering Computations

ISSN: 0264-4401

Article publication date: 25 May 2021

Issue publication date: 7 December 2021

172

Abstract

Purpose

This meshless collocation method is applicable not only to the Helmholtz equation with Dirichlet boundary condition but also mixed boundary conditions. It can calculate not only the high wavenumber problems, but also the variable wave number problems.

Design/methodology/approach

In this paper, the authors developed a meshless collocation method by using barycentric Lagrange interpolation basis function based on the Chebyshev nodes to deduce the scheme for solving the three-dimensional Helmholtz equation. First, the spatial variables and their partial derivatives are treated by interpolation basis functions, and the collocation method is established for solving second order differential equations. Then the differential matrix is employed to simplify the differential equations which is on a given test node. Finally, numerical experiments show the accuracy and effectiveness of the proposed method.

Findings

The numerical experiments show the advantages of the present method, such as less number of collocation nodes needed, shorter calculation time, higher precision, smaller error and higher efficiency. What is more, the numerical solutions agree well with the exact solutions.

Research limitations/implications

Compared with finite element method, finite difference method and other traditional numerical methods based on grid solution, meshless method can reduce or eliminate the dependence on grid and make the numerical implementation more flexible.

Practical implications

The Helmholtz equation has a wide application background in many fields, such as physics, mechanics, engineering and so on.

Originality/value

This meshless method is first time applied for solving the 3D Helmholtz equation. What is more the present work not only gives the relationship of interpolation nodes but also the test nodes.

Keywords

Acknowledgements

The authors sincerely thank the anonymous reviewers for their constructive comments and suggestions which helped us to improve the results of this paper. This work is partially supported by National Natural Science Foundation of China (11772165, 11961054, 11902170), National Natural Science Foundation of Ningxia (2020AAC03059) and National Youth Top-notch Talent Support Program of Ningxia.

Citation

Yang, M., Du, X. and Ge, Y. (2021), "Solution of the 3D Helmholtz equation using barycentric Lagrange interpolation collocation method", Engineering Computations, Vol. 38 No. 10, pp. 3969-3994. https://doi.org/10.1108/EC-09-2020-0516

Publisher

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Emerald Publishing Limited

Copyright © 2021, Emerald Publishing Limited

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