Analysis And Optimization Of Outdoor Winter Wind Environment Around Sports Venues

With the promulgation of the "National Fitness Regulations",China has entered the era of national fitness.In order to increase the occupied area of per capita sport venues,the construction of sports venues across the country is imperative.However,because the shape design of the stadium is mostly circular,elliptical and other streamlined or even irregular shapes,the wind direction will change under the influence of the shape of the building,and the wind speed will become larger,which will easily cause people to feel uncomfortable in their outdoor environment.In this paper,the field measurement method and computer numerical simulation method are combined to analyze the wind field and comfort of the outdoor winter wind environment of Hefei Gymnasium and Fanzhou Stadium of Shenyang Agricultural University,and the main factors that cause the wind environment of the outdoor pedestrian height of the stadium are clearly defined.In order to optimize the outdoor environment of the stadium for the purpose of optimizing the outdoor wind environment,the wind environment simulation and comfort evaluation are carried out for the optimization scheme,and the optimization effect is predicted according to the simulation results,thereby providing practical guidance for creating a comfortable outdoor sports activity venue.The research results demonstrate that:(1)the shape of the building will affect the wind environment.The streamlined design reduces the building's resistance to wind and deflects the wind direction to accelerate the airflow,causing the local wind speed to be very large.(2)Too much space around the building can also cause excessive wind speed,resulting in uncomfortable wind conditions.(3)On the windward side,rational planting of trees has the effect of reducing the wind speed of the incoming stream,and plants can be selected to optimize the outdoor wind environment.(4)As the height of the branching point of the tree increases,the minimum value of the wind speed also increases.When the height of the branching point increases to more than 2m,the maximum wind speed under the forest belt has exceeded the maximum wind speed on the forest belt,and the wind speed value near the downwind tree has exceeded the wind environment comfort threshold.(5)As the height of the tree increases,the minimum wind speed on the vertical line in the forest belt model also increases,but the position where the minimum wind speed appears is gradually farther away from the tree,and the range of influence on the wind speed in the downwind direction increases.(6)When optimizing the outdoor wind environment by means of plants,it is necessary to examine whether the distance between the position where the plant is placed and the problem area is within the range of plant influence.For example,in the optimization,evergreen trees in a branch height of 0.5 m and a tree height of 4 m are selected.If the trees are added in the flow direction in the problem area,it is recommended that the distance from the problem area is less than 10 m;if the flow direction is increased in the problem area Trees,it is recommended that the distance between the trees and the problem area is less than 60 m.(7)Because the outdoor wind environment is very complicated,and the change of native trees may cause changes in many wind environments,it is difficult to achieve perfect results when using tree design to optimize them.The situation is flexible in the optimization results.