多孔溢洪道泄流三维数值模拟

3-D mumerical simulation on discharge of spillway with muti-opening

为了充分体现闸墩对过坝水流的影响,采用有限体积法对含多个孔和多个闸墩的溢洪道进行了水流的三维数值模拟,采用k-ε紊流模型,利用VOF方法处理自由水面,给出了泄流能力、水面线和压力分布。数值模拟结果与模型试验结果对比表明,使用的模型能精确的模拟溢洪道的过坝水流。计算发现,溢洪道不同孔由于受闸墩、边墩等的影响,过坝水流的水面线、坝面压力有着一定的差异,从而为溢洪道的水力设计提供可靠的设计依据。

A 3-D numerical simulation on the discharge from the spillway with multi-opening and multi-pier is made with the finite volume method in order to fully represent the effect of the piers on the overflow; in which k - ε turbulent model is used to process the free water surface, and then the discharge capacity, the water surface profile and the pressure distribution are giv- en. The comparison between the numerical simulation and the model test shows that the overflow from the spillway can be precisely simulated with the model proposed herein; furthermore, the calculation finds that the water surface profile of the overflow and the pressure on the dam for different openings of the spillway are different as well, which makes a reliable basis for the hydraulic design of the spillway on the whole.