Numerical Simulation Research On Wind Environment And Wind Load Of Buildings Under Strong Wind Conditions Based On CFD Technology

Wind is a natural phenomenon caused by air flow,which is closely related to human daily life,and always affects the quality of human life.With the acceleration of China's urbanization process,in order to adapt to the rapid growth of population,urban buildings continue to emerge,so the wind environment of buildings has become an important factor affecting the quality and safety of human life.If the wind speed is too small,it will lead to poor ventilation and difficult diffusion of pollutants;However,if the wind speed is too high,it is likely to endanger the safety of pedestrians or cause damage to the building structure,resulting in huge losses.Therefore,it is of great significance to fully understand the wind environment and wind load characteristics of different types of buildings under gale conditions,to improve the planning and design level of buildings,to reduce the impact of gale weather on buildings,and to protect pedestrian safety.In this paper,based on computational fluid dynamics(CFD)method,through the establishment of model,meshing,parameter setting,solving calculation and other steps,the numerical simulation of different types of buildings in different working conditions is studied,and the optimization strategy research is carried out from the building group scale and building scale respectively,the main work is as follows:1.Three high Reynolds number turbulence models,Standard k-?,RNG k-? and realizable k-?,are selected to simulate the wind pressure coefficients of each facade of CAARC standard high-rise building model under the condition of class D wind field,and the simulation results are compared with the wind tunnel test data to verify the feasibility and accuracy of CFD technology in the numerical simulation of building wind field.The results show that the average error and maximum error of RNG k-? model and wind tunnel test data are about 10.41% and 18.46% respectively,which can meet the accuracy requirements of engineering application.2.Four typical building groups(determinant,oblique,staggered and enclosed)in the city are simulated under three wind directions(forward,oblique and lateral).The results show that the wind environment simulation results of each building group area are the best in the positive windward,and the wind load simulation results are the best in the lateral windward.3.The wind environment and wind load of each building group with wind speed ranging from 8 to 12 are obtained by numerical simulation.Results the average wind speed and the maximum wind speed in the surface of each building group showed a linear increasing trend,while the proportion of safe area decreased.The wind pressure distribution in each building group basically remained unchanged,only the numerical value changed.4.The optimization experiments are carried out on the scale of buildings and the scale of buildings when the buildings are facing the wind.The results show that increasing the vertical spacing of buildings,reducing the density of buildings,reducing the height and width of buildings can effectively optimize the wind environment and wind load simulation results in each area of buildings,and reducing the height of buildings is the most direct and effective method among all optimization strategies.