海流作用下沉管—双驳船沉放系统沉放过程的阻力特性分析

Current induced force of an immersion system comprising a tunnel element and two barges during the immersing phase

文章通过CFD方法对海流作用下沉管管节与双驳船组成的沉放系统在不同沉放水深时的阻力进行分析,采用RANS方程和SST k-ε湍流模型,利用试验结果验证所用模型和方法的正确性。结合沉放过程三个典型工况,分析90°来流时的流场变化对阻力特性变化产生的影响。结果表明数值结果与试验结果差异较小,驳船和沉管之间的相对位置、沉管沉放深度对流阻力大小影响较大。

This paper concerns mainly the current-induced force of an immersion system comprising a tun-nel element and two barges during the immersing phases. A three-dimensional viscous flow around the im-mersion system was investigated using the RANS equation and the turbulence model of SST k-ε. To verify reasonableness of the numerical simulations, results from model tests were introduced and compared with. Main analyses about the current-induced forces in different immersing depth with the same current direc-tion and velocity were deeply investigated. In addition, different flow field characteristics in different im-mersion stages were presented and analyzed to further explain their effects on the current-induced force. The results show that differences between numerical simulations and model tests are rather small, and that current induced forces are greatly influenced by relative position of the tunnel element and barges and by immersing depth of the tunnel element.