摘要
本文通过边界贴体坐标,在物理域生成正交曲线网格。该曲线网格具有准确贴合边界及域内网格布置灵活的特点,克服了矩形网格贴合边界较差及计算域长宽比悬殊的困难。通过坐标转换,将复杂域问题转变成规则长方形域问题的求解,并对新坐标系下的方程采用ADI方法进行数值模拟计算。
To overcome the drawbacks of boundary fitting in using the finite difference method to solve two dimensional unsteady flow of rivers in Cartesian coordinate systems, a numerical model in which boundary can be fitted accurately is established in this paper. Relying on the orthogonality between streamline and isopotantial line of potential flow, a kind of orthogonal curvilinear coordinate system has been formed and used to transform arbitrary physical regions to regular computational regions. The density of orthogonal curvilinear grids can be properly contro lled according to the need of practical problems. In the generated coordinate system, 2—D unsteady flow has been simulated by usilng alternating direction implicit method(ADI).
出处
《水道港口》
1992年第3期1-8,共8页
Journal of Waterway and Harbor
关键词
拟合坐标
非恒定流
河道
ADT法
body-fitted coordinate unsteady flow river ADI method
