针对矩形水槽中梯形边墩周围水流,建立耦合VOF法的三维非稳态水气两相流模型.求解后,将水深与流速分布与试验结果进行对比分析,吻合较好.在此基础上分析梯形边墩附近典型断面的流速矢量分布、绝对流速分布及湍动能分布.结果表明:在梯形边墩上游形成偏斜水流,下游形成同流区的水流结构；在边墩外侧壁处达最大流速值,在边墩上游和外侧附近的湍动能较强烈.%A 3D unsteady model coupled with the Volume of Fluid (VOF) method of water-air two phase flow was established, contraposing the flow in the vicinity of a trapezoid cross-section cylinder placed at a rectangular open channel. After solving, water depth and velocity distribution were contrasted with the test reults, simulated results were in agreement with the model test results. On this basis, the velocity field, velocity vector field and turbulent kinetic energy distribution of the typical sections at different vertical sections in the vicinity of the trapezoid cross-section cylinder were analysed and then compared with the flow characteristics around the vertical semicircular cylinder and a rectangular cross-section cylinder.The results showed that: the skewed flow was formed in the upstream of the cylinder, and a recirculation region was formed in the downstream of the cylinder. The maximum flow velocity was appeared in the outside of the cylinder; the turbulent kinetic energy was strong in the downstream and outside of the cylinder.
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