Study On Numerical Simulation Of Wind Flow Around High-rise Building

Because high-rise building structure is more sensitive to wind action,so,wind load becomes one of the main loads in the control design of such buildings.Therefore,calculating the effect of wind load on buildings has become a hot issue in theory and engineering.This paper mainly describes the basic theory and calculation method of wind engineering,and describes in detail the computational watershed,grid division,boundary conditions,turbulence model and parameter setting involved in the numerical simulation of wind field around the building structure.Moreover,the 3d building structure with different body shape coefficients was simulated by using the computational fluid dynamics software ANSYS FLUENT,and the influence of different body shape coefficients on the wind load of the building was compared in detail.The specific work and conclusions are as follows:1)first,the importance of structural wind resistance is explained,and the research status and research methods of wind engineering at home and abroad are introduced.Then,the wind characteristics and the flow around the building are introduced.The basic theory of computational fluid dynamics(CFD).2)The rectangular building structures with five different shape coefficients are simulated numerically,First of all,the study of 0°and 90° respectively wind direction Angle under wind speed of wind pressure distribution,Velocity vector diagram,Wind pressure distribution cloud chart and Law of motion of flow field of get different shape coefficient under each building.According to the numerical simulation results,Wind speed and pressure at each measuring point,The calculated wind pressure coefficient is compared with the standard value,The suggested value of structural shape coefficient is obtained.3)The rectangular building structure is taken as the research object,the static wind field around a single building and two buildings of the same size are compared and analyzed,the wind pressure distribution on the building surface and the wind field distribution around the building are obtained.Finally,transient simulation analysis is carried out for buildings of the same size of single building and double building respectively,and instantaneous flow pattern and surface wind speed and wind pressure values around single and double buildings are obtained.Analyze and compare the variation rules of vortex shedding in wake form of single and double buildings.Therefore,the influence of adding the structure of the building body on its stress pattern and vortex shedding is analyzed.It provides a valuable reference for the planning of middle and high-rise buildings,the assessment of urban wind environment and the design of high-rise buildings.