The Euler-Euler multiphase flow model is used to simulate wind and rain field of TTU single low build-ing under the combined action of wind and rain,and the relationship between wind speed,rain intensity and the maximum wind-driven rain pressure on the windward wall of low building under nine wind-driven rain conditions is compared and analyzed.The numerical simulation of wind-driven rain pressure of group low buildings under dif-ferent layout and different spacing is carried out,and the main reasons for the difference of wind-driven rain pres-sure distribution characteristics of WDR and aerodynamic interference effect are analyzed.Based on the mecha-nism analysis of wind-driven rain pressure characteristics of wind-rain flow field,the airflow forms a vortex be-tween the front and rear buildings.The wind-driven rain pressure is reduced in the contour area compared with the single body,and the two sides increase obviously.The air flow converges between the left and right buildings,and the wind-driven rain pressure on the inside of the building is higher than that on the outside.The maximum WDR load of single and group low buildings can reach 13.39％and 30.03％of the pure wind load respectively.The results show that the additional rain load in the wind-rain field cannot be ignored,and the load check calcula-tion on the top of the building should be considered in the structural design to improve the design strength.In ad-dition,the layout of the group building should appropriately increase the safety spacing to avoid the adverse effects caused by the airflow blocking effect.
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