摘要
开放源程序代码ELCIRC是采用基于水平向无结构网格、垂向z坐标体系和半隐格式的欧拉-拉格朗日有限体积/有限差分方法来解浅水方程。研究了ELCIRC中除控制方程组求解以外的部分,分析了源程序在插值计算、拓扑结构、定解条件、分层信息和干湿法等技术上的具体操作,尤其是对欧拉拉格朗日模型特有的逆向追踪算法做了详细阐述。同时讨论了一些细节问题,在不恰当的地方给出一些参考和建议,避免小数做分母、相近数相减引起的较大误差。然而,这些经过实际应用的算法原理,可以为我们开发水动力学模型提供有价值的参考。
Open-source semi-implicit Eulerian-code ELCIRC （ Eulerian-Lagrangian CIRCulation） solves the shallow water equations using a Lagrangian finite volume/finite difference method with horizontally unstructured grids and vertically unstretched z-coordinates. ELCIRC source code aside from the governing equation solution is analyzed in this paper. The operation of interpoIation, topological structure, definite condition, hierarchy information, and wet-ting and drying method are described in detail. Back-track, as the key technology of ELCIRC, is expounded com- prehensively. Moreover, some detailed problems are discussed, and a few references and suggestions are given to a- void the errors caused by similar number subtraction and by employing small number as the denominator. ELCIRC has been applied in practice and could serve as a valuable reference for developing hydrodynamic models.
出处
《长江科学院院报》
CSCD
北大核心
2013年第5期97-102,共6页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金面上项目(51079008)
