Numerical Simulation On Wind Characteristics And Interference Effects Between The Flow Field Around A Group Of Wind About Tall Building With Openings

With the development of society,the emergence of tall buildings,wind load has become a major factor in the design.The shape of the building becomes diversification,more and more tall buildings with openings,the hole not only has an effect on the wind pressure of the building,but also can be used to generate electricity;at the same time,the composition of the city is more and more complex,and the interference effect of building group is more prominent.Wind engineering research in these areas is not much,so the openings on the tall building wind engineering research and tall building with openings interference is necessary.In this paper,the method of CFD numerical simulation is used,the wind characteristics of tall building with openings of the rules and opening of tall building group interference problem being studied.The main work of this paper is the following.(1)Firstly,the present situation of the research on the tall building and tall building construction interference group is reviewed.Some basic theories of structural wind engineering are introduced and describes the basic characteristics of the atmospheric boundary layer wind and structural wind load.(2)Computational fluid dynamics theory is the basis of numerical simulation,including the establishment of control equations and discrete,numerical solution of the flow field,the classification of turbulence simulation methods,and so on.(3)The tall building with openings is simulated,wind speed and turbulence intensity parameter is set by UDF programming.Study on the wind field around the hole and hole in high-rise building and wind pressure characteristics of building facades;the wind pressure characteristics of the wind and the wind surface are studied in different position of openings;the research of tall buildings with openings with different layout in the field under the conditions of interference effects.This paper get the following conclusion through the above research: 1)When analysising the tall building which the openings are located in the 0.85 h,the wind speed is weakened in front of the windward side and enhanced on side,symmetric vortices is formed on side,and the wake flow is formed on leeside.Slit effect is generated inside the openings,which should be considered in structure design.The wind pressure are positive on windward side,and decreased near the openings.Its maximum value appeared in the upper part of the openings.The wind pressure distribution on side is complex and negative.Its negative peak value appeared near the windward area.The wind pressure on the leeside is negative and the wind pressure gradient changed little.The negative pressure value has a little increase near the openings.The wind pressure is negative inside the openings and slightly larger in the bottom of the openings.2)The openings have an impact on the wind pressure on the windward and the side,as well as the base bottom bend on the windward,when the openings in the different position.The largest decline drops on the 0.65 h to the openings.So openings in the upper part is favourable.3)Analysis the interference effect of the tall building under the condition of Parallel arrangement,we found that the interference effect to the 1# building have a great influence to the side and inverse side,and have a little influence to the windward side.The interference effect of the cross type arrangement mainly affects the 1# building wind surface and the side surface,and the effect is reduced.The interference effect is not obvious when the staggered arrangement.