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

作　　者：Jie Sha Lixiang Zhang Chuijie Wu 

机构地区：[1]Department of Engineering Mechanics,Kunming University of Science and Technology,Kunming 650500,Yunnan,China [2]State Key Laboratory of Structural Analysis for Industrial Equipment School of Aeronautics and Astronautics,Dalian University of Technology,Dalian 116024,China

出　　处：《Advances in Applied Mathematics and Mechanics》2015年第6期754-779,共26页应用数学与力学进展（英文）

基　　金：supported by Natural Science Foundation of China under Great Nos.11072053 and 11372068,and the National Basic Research Program of China under Grant No.2014CB74410.

摘　　要：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.

关 键 词：Low-dimensional system model partial differential equation analytical solution posterior optimal truncated method 

分 类 号：O17[理学—数学]