一类迎风紧致差分格式全离散特性分析

Behavior analysis of upwind compact difference schemes for the fully discretized convection equation

  • 摘要: 采用Fourier分析方法,通过显式多步Runge-Kutta时间离散一维线性对流方程,导出了一类高精度迎风紧致格式全离散色散关系式。详细分析了不同CFL数下所研究差分格式的耗散、色散及相应的相速度、群速度等特性。以数值实验显示了格式较高的计算精度和分辨率。

     

    Abstract: Based on the Fourier analysis method, a fully-discretized dispersion relation is derived for a family of high accuracy upwind compact difference schemes by considering one dimensional linear convetion equation temporally discretized by the explicit multi-step Runge-Kutta algorithm. The effects of CFL numbers on the characteristics of these schemes, including dissipation and dispersion errors, phase velocity and group velocity, are analyzed. The two-dimensional anisotropy problem is discussed. Moreover, an eigenvalue analysis is performed. Two numerical examples are used to show the high accuracy and resolution of these schemes.

     

/

返回文章
返回