圆紊形墩台尾迹水动力特性开缝控制三维数值分析OA北大核心CSTPCD

Water flows around hydraulic structures such as gate piers and diversion piers,it results in vortex sepa-rated flow.The three-dimensional wake structure has complex hydrodynamic characteristics,and flow control of vortex separated flow is not only necessary for the optimization design of gate piers,but also related to the efficiency and safety of engineering operation.On the basis of verifying the three-dimensional hydrodynamic mathematical model,this article studies the three-dimensional hydrodynamic characteristics of vortex separation flow and flow control after the circular end pier is slotted.It compares the time-averaged velocity distribution,turbulent flow en-ergy,and turbulence intensity distribution in the longitudinal,transverse,and vertical directions under the seam-less and slotted pier schemes,and explores the hydrodynamic characteristics of the slotted pier.Analysis shows that the water flow structure behind the pier can be significantly improved after the opening of the pier.The closer the opening position is to the middle of the water depth,the greater the suppression of the wake vortex behind the pier,and the better the control of the flow around the pier.The opening of the middle position of the water depth greatly affects the upper and lower water flow behind the slotted pier,making the opening the most influential on the time-averaged flow velocity,and the opening also has the greatest and best suppression on the vortex.To sup-press the adverse effects of vortices behind the piers on the project,the water depth behind the piers and abutments should be determined first in the design of the project,and the opening position should be set as much as possible in the middle of the water depth behind the piers and abutments.