Numerical Simulation Study On The Control Of Wind Load And Flow Field Around Bridge Based On Spanwise Passive Suction And Blowing

With the development of society,the span of the bridge is getting larger,which also leads to the reduction of the rigidity and damping of the main structure of the bridge.A flexible long-span bridge will withstand the effects of wind.The complex wind effect is one of the most important dynamic effects affecting the bridge girder.At low wind speeds,the vortex-induced vibration is the main cause of bridge girder vibration.Long-term vortex-induced vibration will bring discomfort to the use of the bridge cause fatigue damage and destruction to the main beam main body and the auxiliary structure.Reducing or suppressing the vortex-induced vibration of bridge girder has important engineering significance.By a number of studies have found,the bridge vortex-induced vibration can be suppressed by destroying the correlation of the vortex in the wake.The passive suction holes are arranged in the upward direction of the bridge model to blow out airflow,which causes a disturbance to the tail vortex in this paper.Through the research on the model wind load and the flow field obtain the control effect.The CFD numerical simulation method is used to analyze the aerodynamic control effect of different arrangement of passive suction and blowholes on the main beam of the bridge in this paper.At the same time,the effect of passive suction control under different wind angles of attack was studied.Firstly,the pressure distribution and aerodynamic changes of the model with different arrangements of passive suction holes at wind attack angle of 0 degree was studied in this paper.And found the passive inhalation and insufflation control can reduce the model's pulsating pressure and aerodynamic pulsating value.Then studied the influence of different wind angles of attack on various control conditions.It is found that under different wind angles of attack,the control effect decreases with the increase angle of attack,and some working conditions even bring negative effects.The flow field under different control conditions and the spanwise flow field and vortex structure at wind attack angle of 0 degree with good control effect were analyzed.