在实际工程中，经常将桥墩设置于弯道水流影响范围之内。当桥墩上游存在偏流现象时，桥墩下游漩涡脱落产生的低流速区与偏流相互影响，导致下游流速分布呈现极不均匀状态，从而对下游边坡与相关建筑物构成危害。为改善弯道水流引起的桥墩下游水流流态紊乱，基于ANSYS Fluent 建立k-ωSST三维数值模拟与物理模型试验相结合的方法，研究不同桥墩尾部形态对下游流速分布的影响，并对下游偏流加剧的原因进行分析。结果表明：当上游来流发生偏移，偏流与桥墩尾部的低流速区之间相对流速差增大时，将导致下游水流紊乱增强；改进桥墩尾端形态可以改善下游流速分布状况，桥墩尾端长度与稳流效果在本研究范围内呈正相关关系，桥墩前端圆弧半径与稳流效果呈负相关关系。本研究成果可为弯道水流中桥墩修建等提供参考。

In practical engineering, bridge piers are frequently located within the influence of bending water flow. When there is a deviation in the flow upstream of the bridge pier, the low-velocity area created by the shedding of vortices downstream of the bridge pier interacts with the deviation flow. This leads to a highly uneven distribution of flow velocity downstream, posing a hazard to the downstream slopes and related buildings. To improve the disturbance of flow pattern downstream of the bridge pier caused by curve flow, a method of k-ω SST 3D numerical simulation and physical model test were established based on ANSYS Fluent. The influence of different pier tail shapes on downstream velocity distribution was studied, and the causes of downstream deviation were analyzed. The findings indicated that when the incoming flow upstream shifted and the relative velocity difference between the shifted flow and the low-velocity area behind the pier increased, it led to an increase in turbulence in the downstream flow. Enhancing the design of the downstream end of the pier can improve the distribution of velocity downstream. The length of the tail end of the pier had a positive correlation with the steady flow effect, while the radius of the arc at the front end of the pier had a negative correlation with the steady flow effect in the scope of this study. The research results can reference related projects such as bridge pier construction in curved water flow.