挖泥船绞刀二维清水流场数值模拟

Numerical Simulation of 2-D Water Flow in and around Cutter of a Dredger

基于时均N-S方程对绞刀内部及周边流场进行二维数值模拟分析,采用标准k-ε湍流模型与多参考系模型对绞刀进行动静耦合的定常数值计算,获得不同绞刀转速与泵吸流量组合时的流场状态。以定常湍流计算作为初始条件应用RNG k-ε模型和滑移网格技术进行了绞刀流场的非定常数值计算,得到了流场参数随时间变化及动静区域间的影响与干涉。研究成果有助于初步认识绞刀内部及周边流场,可供绞刀设计及挖泥船施工参考。

Numerical simulation of 2-D water flow in and around a cutter based on the Reynolds averaged Navier-Stokes equations was conducted in this paper.The dynamic-static coupling simulation of the steady turbulent flow was calculated with the stand k-ε model and MRF model,the whole flow fields in different combinations of the cutter rotation speed and suction velocity were obtained.The simulation of the unsteady flow was conducted on the RNG k-ε model.The steady flow fields simulated were used as the initial conditions of the unsteady simulation,in which the moving mesh technique was employed and reasonable conclusion of the flow parameters change over time was acquired.The results are helpful to understand the flow fields in and around the cutter,and also can give some suggestions on cutter design and dredger construction.