Small-Stencil Pad Schemes to Solve Nonlinear Evolution Equations
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摘要: 在有理逼近的紧致格式的理论基础上,采用特别的统一的Padé逼近形式,构造了针对高阶非线性发展方程的、简单小模板的差商格式.不仅保持了格式的四阶精度,而且还可以采用追赶法求解得到的3对角矩阵,或者采用三阶Runge-Kutta法直接求解积分.计算效果通过多种算例表明是十分令人满意的.相对于其他差分格式,此方法具有模板较小而精度保持四阶的优点.Abstract: A set of small-stencil new Pad schemes with the same denominator are presented to solve high-order non-linear evoltuion equations. Using this scheme, the fourth-order precision cannot only be kept, but also the final three-diagonal discrete systems are solved by simple Doolittle methods, or ODE systems by Runge-Kutta technique. Numerical samples show that the schemes are very satisfactory. And the advantage of the schemes is very clear compared to other finite difference schemes.
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Key words:
- evolution equation /
- compact scheme /
- Pad scheme /
- node stencil /
- soliton
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