http://www.paper.edu.cn
-1-
A NEW KIND OF UNIVERSAL DIFFERENCE SCHEME
FOR SOLVING NONLINEAR SINE-GORDON
EQUATION
*
Na Guo, Xiao-Zhong Yang
Department of Mathematics and Physics North China Electric Power University, Beijing (102206)
E-mail: tian_fanqie@163.com.
Abstract
For Sine-Gordon equation having great important physical background, in this paper, we give a
kind of weighted implicit difference scheme for the non-linear Sine-Gordon equation, use the
Taylor series expansion methods for non-linear approach, omit high-level error, and keep the first
three of its approach, using Fourier analysis to analyze the stability of the scheme. Finally, the
numerical experiments show that the different values of the parameters have a impact on the
effectiveness of the scheme and stability. We found that when the parameters is 1 / 2, the scheme of
the numerical solution have a higher accuracy which prove that the structure of the format is
practical .
Keywords:Sine-Gordon equation;weighted implicit scheme;computational stability;Fourier
analysis;numerical experiment
1. Introduction
Sine-Gordon equation is an important non-linear equation, and like general nonlinear partial
differential equations, only at a special initial value and boundary value conditions, it has analytical
solution, the general situation can only be numerical. Many physical problems can be described by the
equation, such as: the spread of crystal faults, crystal dislocation, magnetic spin waves in ferromagnetic
materials, as well as the spread of two-phase medium laser pulses and so on. In the question of the
Josephson transmission line, the item of
usin
stated that the Josephson current through the insulator
between two superconductors; in the crystal dislocation problems, the appearance of the item of
usin
due to the periodic structure of the atomic arrangement. The form of the equation is
[1,2]
:
0sin
2
2
2
2
=+
∂
∂
−
∂
∂
u
u
t
u
(1)
For solving the problem, Guo Yucui(2008)
[2]
has been given a kind of solitary wave solutions,
but there is no difference numerical simulation. Xu Qiubin
[3]
has proposed two implicit difference
scheme for the initial boundary value problem of a kind of nonlinear Sine-Gordon equation, and used
the discrete functional analysis method to prove the convergence and stability of the format. Zhang
Luming and Chang Qianshun
[4]
have put forward a nine o'clock conservation difference scheme for
the Sine-Gordon equation, proved that the convergence and stability of the numerical solution through
a priori estimates. Then, after the selection of the parameters, he analyzed the precision. Zhou Yanzu
[5]
has given the explicit and implicit difference scheme for a nonlinear Sine-Gordon equation, analyzed
their local truncation error and the stability and convergence, numerical experiments were carried out
to compare their truncation error and computational speed which showed that certain explicit format
has poor stability.
In this paper, at the basis of existing literature, construct a new weighted implicit difference scheme
for the nonlinear Sine-Gordon equation. Give the following one-dimensional Sine-Gordon equation of
the initial boundary value problem
[2,3]
:
*
This work was supported in part by National Natural Science Foundation of China (Grant No. 10771065) and
Natural Science Foundation of Hebei Province (A2007001027).