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

作　　者：Jen-Yi Chang Ru-Yun Chen Chia-Cheng Tsai 

机构地区：[1]Tainan University of Technology,Tainan 71002,Taiwan China [2]Department of Harbor and River Engineering,Taiwan Ocean University,Keelung 202301,Taiwan China [3]Bachelor Degree Program in Ocean Engineering and Technology,Taiwan Ocean University,Keelung 202301,Taiwan China [4]Center of Excellence for Ocean Engineering,Taiwan Ocean University,Keelung 202301,Taiwan China

出　　处：《Advances in Applied Mathematics and Mechanics》2022年第3期577-595,共19页应用数学与力学进展（英文）

基　　金：The Ministry of Science and Technology of Taiwan is gratefully acknowledged for providing financial support to carry out the present work under the Grant No.MOST 109-2221-E-992-046-MY3.

摘　　要：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.

关 键 词：Pascal polynomial polynomial expansion method polynomial method of particular solutions collocation method multiple-scale technique 

分 类 号：O175[理学—数学]