河冰数值模拟中不规则边界处理技术探讨  

Study of the Treatment Technology of Irregular Boundaries for Numerically Simulating River Ice

作　　者：陈胖胖[1] 王军[1] 

机构地区：[1]合肥工业大学土木建筑与水利工程学院,安徽合肥230009

出　　处：《冰川冻土》2012年第6期1353-1357,共5页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(50979021);合肥工业大学科学研究发展基金项目(2010HGXJ0064)资助

摘　　要：数值模拟是河冰问题研究的重要手段之一,但受限于天然河道的复杂地形条件,研究工作开展中往往面临不规则边界的处理问题.基于河冰数值模拟工作现状,总结和阐述了贴体网格技术对其的应用.针对二维数值模拟提出了采用滑动边界法和势流理论式相结合的方法来进一步提高边界处网格的正交性;三维网格生成则宜采用σ竖向坐标变换法;河冰模拟中水面位置确定通常采用标高函数法;对于非稳态河冰数值模拟,动边界处理技术可考虑改进并应用干湿法.Numerical simulation is an important method of studying river ice problem.However,due to the complex topography conditions of a natural river,those irregular boundaries must be dealt with reasonably for further research.Based on the study status of river ice numerical simulation,body-fitted coordinates are applied for treating the technology of irregular boundaries,which are summarized in the paper.Sliding boundary method combined with potential flow theory formula is applied for two dimension girds generation,and the σ-coordinates transformation is introduced for the three dimensions girds generation.Water surface location is usually determined by elevation function method.To simulate the unsteady river ice flow,the modified dry or wet method can be considered to deal with the moving boundary situation.

关 键 词：河冰数值模拟 贴体网格 滑动边界法 水面位置确定 动边界技术 

分 类 号：TV131.6[水利工程—水力学及河流动力学]