CFD Numerical Simulation Of Wind-induced Vibration Considering Coupling Effect And Fluctuating Wind For High-rise Building Structure

In recent years, large numbers of high-rise building structure hasappeared.Their structures has a common characteristics with high, thin and softwhich makes the fluid-structure interaction effect very obvious under the windload and the effects of the fluctuating wind on the wind-sensitive structures arealso essential. Therefore, there are some theoretical research value andapplication on study the entrance of turbulent fluctuation and the couplingeffect between the wind field and building structure. The method of CFDnumerical simulation is employed in present paper to explore adding theturbulent fluctuation entrance on the CFX fluid analysis software. Moreover,the research results are employed to analyse the flow around and fluid-structureinteraction of the high-rise building structure.The main contents are included asfollows:Firstly, the achieve of a turbulent fluctuation on inflow boundary condition:at first, generate the fluctuating wind time-history based on the AR method andKarman spectrum; then, compiled the function and expression about thefluctuating wind time-history in CFX pre-processing module; at last, monitorthe wind speed time-history of the monitoring points on the entrance and in thewind filed.Secondly, the analysis of wind flow around the rigid model of high-risebuilding structure: based on the CFX flow field analysis platform and used theLES turbulence model to simulate the flow around of the simplified model ofthe high-rise building at six different kinds inlet boundary condition. Analysisthe law of wind pressure distribution on the surface of structure and in the windfield. Furthermore, study the variation law about the average and fluctuatingwind pressure coefficient at the monitoring points which on the structuresurface and the aerodynamic characteristics with the variation of the inletconditions and high.Thirdly, the analysis of fluid-structure interaction between the wind field and the elastic model of high-rise building structure: using the LES turbulentmodel, finish the numerical simulation of fluid-structure interaction betweenthe wind field and the simplify aeroelastic model of the high-rise building infive different inlet conditions based on the CFX and Workbench softwares.Analyses the characteristics of wind pressure and vorticity contours on thesurface of the structure and in the wind field, and also the displacementcharacteristics at different hight of the structure. Furthermore, study theinfluence of the fluctuating wind to the fluid-solid coupling process and thecoupling effect to the aerodynamic characteristics at different hight of thestructure.