Numerical Wind Tunnel Simulation Of Slab High-rise Building Based On CFD

With the social economy and urbanization process developed rapidly,in order to meet the needs of large number of urban population living,the city of the future architectural type ineluctable to towards high-rise even super-tall building direction.In the north of China,slab high-rise buildings occupy the majority of building types.For plate high-rise building wind load problem has always been a leading plate one of the major problems of high-rise building structure.Especially in the dense urban area,the wind load on the building surface becomes complex and changeable due to the mutual interference between multiple slab high-rise buildings.In addition,the wind environment around the buildings is also unpredictable.However,in recent years,most of the researches on the influence of wind on buildings are focused on the research of point high-rise buildings,and less on the research of slab high-rise buildings.The fundamental difference between board building and point building is that the length-width ratio of board building is much higher than that of point building,which leads to the situation of wind influence on all sides of board building is very different from that of point building.So the plate of the high-rise building wind load and wind environment in the buildings has important significance for further research.Based on ANSYS Fluent software platform,this paper carries out systematic numerical simulation analysis on typical slab high-rise buildings and slab high-rise buildings.The main work contents are as follows:Numerical simulation analysis was carried out on the pavilions plate high-rise buildings.Firstly,the influence of building form change on wind pressure distribution on building surface is analyzed and discussed by changing the ratio of building length to height.The results show that the length of the building has a certain influence on the wind pressure distribution on the building surface.The longer the length of the building,the greater the maximum negative pressure on the negative pressure surface and the larger the positive pressure area on the positive pressure surface.Then keep the shape of the building unchanged.Changing the wind direction angle in wind tunnel simulation and analyze the influence of wind direction on the wind pressure distribution on the building surface.The results show that when the wind angle reaches 30 degrees,the windward side begins to be subjected to positive pressure.And until 90°,it is completely subjected to positive pressure.On the other hand,with the increase of the wind Angle,the front side gradually goes from positive pressure to negative pressure.When the wind direction Angle is 45°,the maximum negative pressure on the top is the largest.Numerical simulation and analysis of wind-induced disturbance effect of double slab high-rise buildings are carried out.Firstly,the numerical simulation of two buildings arranged side by side is carried out.Simulation results show that the impact on the inner side is greatest when the two buildings are placed side by side.The negative pressure coefficient of the inner surface increases as a whole,while the influence of the other surface is small.Then the simulation analysis is carried out on the double buildings arranged in series.The results show that the disturbance of the rear building is more obvious,and the front of the rear building is completely affected by the negative pressure.Moreover,the farther the distance between the two buildings is,the greater the negative pressure on the front of the rear building,the smaller the negative pressure on the back.When the height of the front row building is lower than the height of the back row building,the unshaded area of the disturbed building is completely affected by the positive pressure.Until the height of the front row disturbed building is the same as that of the back row disturbed building,the front row building is completely affected by negative pressure.However,when the height of the front row building increases gradually and is higher than that of the rear row building,the overall negative pressure coefficient of the rear row disturbed building increases.The wind environment of 3×3 plate-type high-rise buildings with the layout of determinant and diagonal column is simulated and analyzed,and the pedestrian comfort index and wind speed ratio evaluation standard are combined as the evaluation standard of wind environment.By changing the wind direction,the paper discusses which wind direction is more favorable to pedestrians and residents under the two layout forms of the buildings.Results show that the direction of the wind in the determinant layout Angle between 60°-90°field between the maximum wind speed is small,and the wind speed distribution is relatively uniform,wind environment is better.However,in diagonal layout,the wind environment is ideal when the wind direction Angle is between 75 ° and90 °.Therefore,when designing and planning buildings,planning should be carried out according to the local climate and wind direction,which plays a positive role in improving the urban wind environment.