Numerical Simulation Of The Vortex-Induced Vibration Of Nearly Streamlined Section

With the increasing of modern big span structures and tall structures gradually,vortex-induced vibration has increasingly become the focus of research. Wind tunnel test isstill the main measure of the present research, because it can provide reliable designparameters for engineering practice, but this kind of traditional method has its limitations, forexample, the flow field change and mechanism can not make clear; The computational fluiddynamics is the new development of the subject, in the engineering field it has uniqueadvantages, for example,it can avoid Reynolds number effect brought by similar model inwind tunnel model test and at the same time flow field can be visualization, these makepeople know from mechanism on the whole process of vortex-induced vibration. Andcompared with the wind tunnel test, CFD has a large advantage,no matter from material andfinancial resources, time.This article drived grid to realize the fluid-solid coupling calculation through Newmangrams embedded in FLUENT software. It reveals the characteristics and laws ofvortex-induced vibration of the structure. Moreover, the research results are employed toanalyze flow field around the section and the wind-induced vibration of an actual commonlyused nearly streamlined section of big span bridge.First of all, the unsteady flow field calculation based on k-ω SST model is to get liftcoefficient, resistance coefficient, Strouhal number, etc.Comparing these values with classicaltest values and calculation to verify the numerical simulation accuracy of static flow field.Second, dynamic flow field calculation around square column based on k-ω SST model is toget more accurate characteristics of displacement changes with time.It reproduces the vortexshedding patter change in Lock-in wind speed domains,through which verifies the correctnessof the vortex induced vibrations by UDF program. Finally, vortex-induced vibration of nearlystreamlined section used in large span bridge by numerical simulation based on k-ω SSTmodel gets a good vortex vibration phenomenon,compared with wind tunnel test.