计算物理 ›› 1989, Vol. 6 ›› Issue (3): 340-346.

• 论文 • 上一篇    下一篇

Petrov-Galerkin有限元法求正则化长波方程的数值解

唐世敏, 王唯   

  1. 北京大学 力学系
  • 收稿日期:1988-10-21 出版日期:1989-09-25 发布日期:1989-09-25

HUMERICAL SOLUTION OF THE REGULARSZEB LOG-WAVE EQUATION BY PETROV-GALERKIN FINITE EIEMENT METHOB

Tang Shimin, Wang Wei   

  1. Department of Mechanics, Pekinh University
  • Received:1988-10-21 Online:1989-09-25 Published:1989-09-25

摘要: 本文给出数值求解正则化长波方程(简称为KLW方程)初值问题的一种Petrov-Galerkin有限无法。由于它对时间和空间变量分别有二阶和四阶精度,所以对一个孤立波的进波解,数值结果与精确解极为吻合。对于两个孤立波的相互碰撞,则发现碰撞后有微小振荡尾波存在,从而严格说来,它们不具备孤立子的性质。

关键词: 正则化长波方程, Petorv-Galerikn有限元法, 孤立波, 孤立子

Abstract: A numerical solution of the initial value problem of regularized long-Wave equation (RLW Equation) was made by a Petrov-Galerkin finite elemnte method. The numerical resuts are consistent with the exact solution of propagation of single solitary wave, due to second-order and fourth-order accuracy for the time and spacing variable respectively. For the collision of two solitons, there is a slight oscilatoiy wave trail after their collision, so it doesn't have the quality of soliton strictly.

Key words: R L W equation, Petrov-Galerkin finite element method, solitary wave, soliton