NUMERICAL SIMULATION OF WIND LOAD ON A GYMNASIUM UNDER TORNADO EFFECT
This paper explores the distribution of wind load in the core stadium under the action of tornado.Based on the Ward-type tornado generator,the numerical simulation research method of SST shear stress transmission tur-bulence model is used to study the wind pressure coefficient,wind speed trace and vorticity of the stadium with dif-ferent eddy ratios,and ground roughness.The calculation results show that with the vortex ratio increases,the vortex core radius increases,and the surface wind pressure of the gymnasium changes from a stable value to a drastic value.With low vortex ratios,the central area of the gymnasium surface forms a large negative pressure,and the contours are dense and show a pressure difference,which is susceptible to damage.The vortex amount is present in the gap between the cell bodies,and the flow separation forms due to the obstruction of the cell body to the air flow.The sep-aration bubble forms a discrete vortex,and the vortex falls off to the position where the cell body intersects.The wind field is symmetrically distributed with the center of the convection zone presenting the maximum wind speed;the air-flow is vertically upward,and two vortices appear symmetrically on both sides.Under a low vortex ratio,the central region is more susceptible to damage,whereas the whole area is more susceptible to damage at a high vortex ratio.
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