某重力坝泄洪底孔水力特性的数值模拟研究

为了充分研究泄洪底孔的水力特性，利用FLUENT软件，采用标准 k～ε紊流数值模型和体积分数法（VOF ）自由表面追踪技术，对某重力坝泄洪底孔全程进行了三维数值模拟研究。数值模拟得到了设计和校核洪水位两种工况下，泄洪底孔的沿程水面线、压力以及流速分布等水力特性。数值模拟结果与模型试验数据对比分析显示，二者吻合较好。研究表明数值模拟在实际工程运用中是可行的。

Numerical Simulation of Hydraulic Characteristics at Bottom Outlet

By using FLUENT ,a 3-D flow field numerical simulation at the bottom outlet was established in order to ful-ly capture the hydraulic characteristics of the bottom outlet ,in which the standard~turbulence model and the volume fraction method (VOF) on free surface tracking technology were adopted .The hydraulic characteristics such as free water surface ,pressure field and velocity of the bottom outlet were achieved under the design flood level and the check flood level .The results of the simulated calculation were compared and analyzed with the model test data ,and good agreements were obtained .The conclusion is numerical simulation of the bottom outlet water discharge process is feasible .