阶梯式溢洪道的数值模拟研究

Numerical Simulation Study on A Stepped Spillway

为了充分研究阶梯溢洪道对水流的影响,采用标准k-ε模型模拟紊流,利用VOF法追踪自由水面,分别对某阶梯式溢洪道在设计洪水位和校核洪水位下进行了三维流场数值模拟,并将沿程水面高程、底板压力及断面流速分布的计算结果与模型试验数据进行对比验证,两者吻合良好,数值模拟能够快速提供更加细腻、完整的流场信息。计算发现,最大负压值位于首个台阶立面处,从而为溢洪道的优化设计提供可靠的依据。

A 3D flow field numerical simulation for a stepped spillway was established under the design flood level and the check flood level respectively,in order to fully research the impact of the steps on the overflow. In which the standard k - ε model was used to simulate turbulence and the VOF method to track the free surface. The results of the free water surface,bottom pressure and velocity were compared and analyzed with the model test data. They were in good agreement. The numerical simulation can provide smoother and completer flow field information rapidly. It can be seen that the maximum negative pressure is on the vertical surface of the first step,which can provide reliable theoretical basis for the spillway optimal design.