明渠流动S-K模型在具有垂直壁面的复式断面下的数值模拟  

Numerical simulation of SKM in open-channel with vertical wall

作　　者：刘达[1,2,3] 芦妍婷[4] 李连侠[1] 谭超[2,3] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]广东省水利水电科学研究院,广东广州510610 [3]广东省水动力学应用研究重点实验室,广东广州510610 [4]沈阳市城市水资源管理办公室,辽宁沈阳110002

出　　处：《武汉大学学报（工学版）》2012年第2期148-151,156,共5页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51079091);教育部博士点新教师基金(编号:20090181120013)

摘　　要：在具有垂直壁面的复式断面S-K模型数值计算中一般都是采用斜坡近似法,但该方法在滩槽交界面处的流速计算值与S-K模型解析解差别较大,为解决该问题,提出了结合解析解求解时拟定的边界条件的耦合迭代方法,该方法大大改善了斜坡近似法的不足,其数值模拟结果与S-K模型解析结果吻合良好,能够更为精确地计算棱柱体河槽深度平均流速分布和壁面切应力分布,可有效解决直立壁面边界速度突变的问题,对数值计算中类似问题的解决具有参考价值,也为S-K模型在实际工程中的广泛应用提供新的途径.Slope approximation method has generally been used in numerical simulation of SKM that contains channel cases with vertical wall. However, the slope approximation method neither solved the discontinuity at interface with vertical wall nor obtains accurate depth-averaged velocity and shear stress distribution in lateral direction. Intending to solve this problem, this essay proposes coupled iteration combining boundary condition of analytical solution. The coupled iteration method is superior to the slope approximation method, not only because its numerical simulation corresponded to analytical solution SKM more closely, but can obtain analytical solutions of depth-averaged velocity, shear stress distribution more precisely. Moreover,the method can effectively solve discontinuity at interface arising from channel cases with vertical wall, which plays a positive role in providing reference to tackling similar issues and extending practical application scope of SKM.

关 键 词：水力学 S-K模型方法 数值模拟 垂直壁面 斜坡近似法 耦合迭代法 

分 类 号：TV131.21[水利工程—水力学及河流动力学]