Research On The Characteristics Of Wind Resistance Effect On The Distribution Of Wind And Rain On The Facade Of The Building Complex

Wind Driven Rain(WDR)is a natural phenomenon of rain falling obliquely in the air driven by horizontal wind.It is the most important source of moisture on the building surface.The exterior wall of the building will be eroded to varying degrees.Rainwater and its chemical composition It will have a certain erosive effect on the outer wall of the building,and in severe cases,it will affect the durability and thermal performance of the building wall.An in-depth study of the wind-driven rain effect under the combined action of wind and rain in a building complex is the premise and foundation for properly solving the above problems.In the wind field,the wind speed in front of the windward front of the building will be reduced due to the obstruction of the building itself to the wind field,which is called the wind resistance effect.The wind resistance effect will seriously affect the distribution of rainwater on the windward facade of the building,and buildings of different sizes will reduce the wind speed in front of them to varying degrees,affecting the distribution of the WDR of the building.At present,the research on the influence of wind resistance effect on the WDR of windward facades of buildings is mostly aimed at single buildings,and the research on the influence of wind resistance on building groups is rare.In order to consider the influence of the wind-driven rain effect of the building complex under the combined action of wind and rain,the numerical simulation method is used to carry out the following research work.Under the framework of Euler-Euler,a numerical simulation method for solving steady-state WDR field based on the Euler multiphase flow(EM)model is simulated and analyzed on the premise of verifying the effectiveness of numerical simulation by comparing the measured cases.Effectiveness,by studying the influence characteristics of the wind resistance effect of the building group layout itself on the wind-driven rain distribution on the windward facade of the building in front,as well as the influence of parameters such as wind speed and rain intensity,it is obtained that the unit fa?ade area of the double building can reduce the front The rear building size of the building fa?ade grab rate gives the recommended value of the average pressure coefficient of the front row building facade under the four building layout.This paper simulates and analyzes two buildings of equal height and width in series arrangement(the building spacing is not less than the building height,and the height-width ratio is not less than 1/2).The top of the fa?ade is the most unfavorable.Except for a very small area at the bottom of the fa?ade,the wind resistance effect is larger due to the influence of the vortex.The influence of the wind resistance effect in other positions gradually weakens with the increase of the fa?ade height.Therefore,the outer corner of the top of the building fa?ade It is the weakest part of the wind resistance effect.The study also shows that under the conditions of low wind speed and low rain intensity,the effect of wind resistance on the building complex is more obvious.When studying the distribution law of wind speed,rain intensity,height difference and width difference on building fa?ade grab rate,the combination of the most unfavorable interference conditions is obtained: the most unfavorable interference wind speed is 20m/s,the most unfavorable interference rain intensity is 5mm/h,The most unfavorable interference height difference and width difference are both 0m.When the wind speed is 10m/s,the maximum average pressure coefficient on the building facade is-1.26.When the double buildings are arranged in the front and rear along the direction of the incoming flow,the rear buildings with the same height and width have the best effect on reducing the capture rate of the front building fa?ade per unit area of the windward fa?ade of the front building.Under the most unfavorable working conditions,affected by the rear buildings,the maximum grab rate of the front building facade is reduced from 3.41 to 2.08,and the maximum drop is 39%.When four buildings are arranged,when the height of the rear building is3 times that of the front,the reduction value of the facade grab rate of the front building within the unit area of the facade is the most significant.Under the most unfavorable working conditions,the maximum grab rate of the front building facade is reduced from 2.64 to 2.10,with a maximum reduction of 21%.The average pressure coefficient on the outside of the front building facade is relatively large,and it is basically not affected by the arrangement of the rear buildings.This paper gives the recommended values of the average pressure coefficient of the front building facade under five working conditions,which can provide a reference for the wind and rain resistance design of the building.The paper has 68 figures,27 tables,and 70 references.