This numerical study of scour process tested the skills of computational fluid dynamics in modeling the unsteady flow field during the scour development stage by two-dimensional turbulent wall jets under a sluice gate. The modeling was found to well describe the experimentally observed flow patterns, that is, the main jet diverged to a returning jet and a tail jet. The model also correctly predicts the evolution of the scour depth and length. We examined the self-similarity of the profiles of scour bed and overlying velocities throughout the entire scour development and equilibrium stages. We found self-preserved profiles of velocities and scour beds using local jet parameters. Four growth curves were compared in describing the temporal evolution of scour depth. Finally, non-dimensional scaling of the equilibrium maximal scour depth was investigated. We used the theory of wall jet, and suggested that a modified jet Froude number can be used to predict the equilibrium scour depth, which accounts for the attenuation of the jet velocities along the apron.

这项冲刷过程的数值研究测试了计算流体动力学在冲刷发展阶段通过闸门下的二维湍流壁射流模拟非定常流场的技能。发现该模型很好地描述了实验观察到的流动模式，即主射流分流为返回射流和尾部射流。该模型还正确地预测了冲刷深度和长度的演变。我们检查了整个冲刷发展和平衡阶段冲刷床剖面和上覆速度的自相似性。我们使用局部喷射参数发现了速度和冲刷床的自我保存剖面。比较了四种生长曲线来描述冲刷深度的时间演变。最后，研究了平衡最大冲刷深度的无量纲缩放。我们利用壁面射流理论，提出修正射流弗劳德数可以用来预测平衡冲刷深度，它解释了射流速度沿停机坪的衰减。