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A Novel Low-Dimensional Method for Analytically Solving Partial Differential Equations

Published online by Cambridge University Press:  09 September 2015

Jie Sha ,
Lixiang Zhang  and
Chuijie Wu
Jie Sha
Affiliation:
Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
Lixiang Zhang
Affiliation:
Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming 650500, Yunnan, China
Chuijie Wu*
Affiliation:
State Key Laboratory of Structural Analysis for Industrial Equipment School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China
*
*Corresponding author. Email: shajie9981@gmail.com (J. Sha), zlxzcc@126.com (L. X. Zhang), cjwudut@dlut.edu.cn (C. J. Wu)
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Abstract

This paper is concerned with a low-dimensional dynamical system model for analytically solving partial differential equations (PDEs). The model proposed is based on a posterior optimal truncated weighted residue (POT-WR) method, by which an infinite dimensional PDE is optimally truncated and analytically solved in required condition of accuracy. To end that, a POT-WR condition for PDE under consideration is used as a dynamically optimal control criterion with the solving process. A set of bases needs to be constructed without any reference database in order to establish a space to describe low-dimensional dynamical system that is required. The Lagrangian multiplier is introduced to release the constraints due to the Galerkin projection, and a penalty function is also employed to remove the orthogonal constraints. According to the extreme principle, a set of ordinary differential equations is thus obtained by taking the variational operation of the generalized optimal function. A conjugate gradient algorithm by FORTRAN code is developed to solve the ordinary differential equations. The two examples of one-dimensional heat transfer equation and nonlinear Burgers’ equation show that the analytical results on the method proposed are good agreement with the numerical simulations and analytical solutions in references, and the dominant characteristics of the dynamics are well captured in case of few bases used only.

Keywords

65M1078A48Low-dimensional system modelpartial differential equationanalytical solutionposterior optimal truncated method
Type
Research Article
Information
Advances in Applied Mathematics and Mechanics , Volume 7 , Issue 6 , December 2015 , pp. 754 - 779
Copyright
Copyright © Global-Science Press 2015 

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