A Comparative Study on Polynomial Expansion Method and Polynomial Method of Particular Solutions

A Comparative Study on Polynomial Expansion Method and Polynomial Method of Particular Solutions

Year:    2022

Author:    Jen-Yi Chang, Ru-Yun Chen, Chia-Cheng Tsai

Advances in Applied Mathematics and Mechanics, Vol. 14 (2022), Iss. 3 : pp. 577–595

Abstract

In this study, the polynomial expansion method (PEM) and the polynomial method of particular solutions (PMPS) are applied to solve a class of linear elliptic partial differential equations (PDEs) in two dimensions with constant coefficients. In the solution procedure, the sought solution is approximated by the Pascal polynomials and their particular solutions for the PEM and PMPS, respectively. The multiple-scale technique is applied to improve the conditioning of the resulted linear equations and the accuracy of numerical results for both of the PEM and PMPS. Some mathematical statements are provided to demonstrate the equivalence of the PEM and PMPS bases as they are both bases of a certain polynomial vector space. Then, some numerical experiments were conducted to validate the implementation of the PEM and PMPS. Numerical results demonstrated that the PEM is more accurate and well-conditioned than the PMPS and the multiple-scale technique is essential in these polynomial methods.

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Journal Article Details

Publisher Name:    Global Science Press

Language:    English

DOI:    https://doi.org/10.4208/aamm.OA-2020-0385

Advances in Applied Mathematics and Mechanics, Vol. 14 (2022), Iss. 3 : pp. 577–595

Published online:    2022-01

AMS Subject Headings:    Global Science Press

Copyright:    COPYRIGHT: © Global Science Press

Pages:    19

Keywords:    Pascal polynomial polynomial expansion method polynomial method of particular solutions collocation method multiple-scale technique.

Author Details

Jen-Yi Chang

Ru-Yun Chen

Chia-Cheng Tsai