串列双圆柱桥墩周围流场特性研究

Study on the Characteristics of Flow Field Around Double Cylinder Piers in Tandem

串列双圆柱桥墩周围流场与两桥墩间距密切相关,采用黏性流求解方法,使用商业CFD软件中的FLUENT软件,并基于RNGk-ε湍流模型对单圆柱及串列双圆柱桥墩绕流非稳态瞬时流场进行了数值模拟。研究结果表明:桥墩间距影响着两桥墩墩后尾涡的生成与脱落;桥墩墩后横向流速呈正负交替变化;以碍航紊流宽度为标准,航道边线与串列双圆柱桥墩边壁之间的横向安全距离至少应为1.5倍桥墩直径。

The flow field around double cylinder piers in tandem is closely related to the distance between two piers,this paper simulates the unsteady transient flow field of the single cylinder and double cylinder piers in tandem based on the RNG k -ε turbulent model through the viscous flow solution method and FLUENT which is one of the commercial CFD software.The results show that the distance between the two piers influences the generation and shedding of the wake vortex at the rear of piers;the lateral velocity at the rear of piers changes from positive value to negative value or in reverse;and taking navigation-obstructing turbulence width as a standard,the transverse safety distance between the channel border and the wall of double cylinder piers in tandem should be at least 1.5 times of the diameter of the pier.