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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.
Generally, the slope approximation method is adopted in the numerical calculation of a SK model with a vertical wall. However, the difference between the calculated velocity and the analytical solution of the SK model at the interface between the beach and the sea surface is quite different. In order to solve this problem, The coupled iterative method for solving the boundary conditions of the solution is analyzed. The method greatly improves the shortcoming of the slope approximation method. The numerical simulation results are in good agreement with the analytical results of the SK model, which can calculate the average velocity distribution of the depth of the prism channel more accurately and Wall shear stress distribution can effectively solve the problem of abrupt change of the vertical wall boundary velocity. It is of reference value for solving similar problems in numerical calculation and also provides a new way for SK model to be widely used in practical engineering.