Numerical Simulation Of Wind-induced Snow Drifting On A Flat L-shaped Double-slope Roof

Planar L-shaped double-slope house is widely used in camping house and civil house in China.Used in great quantities as lightweight materials in housing construction,non rectangular plane L double light housing on the snow slope is more sensitive to wind load often become the control load,but at home and abroad related to the load in the specification,there is no about the plane L double slope roof of snow distribution coefficient,and haven’t seen for plane L double slope roof wind-induced snow drift research reports.In engineering practice,the design can only refer to similar building shape or experience,which may lead to safety risks.Therefore,it is of good theoretical significance and engineering value to analyze and discuss the distribution law and distribution coefficient of snow cover on L-shaped double slope roof.In order to obtain the law of wind-induced snow drift of L-shaped double-slope roof,Fluent software was used to select the Mixture multiphase flow model based on Euler-Euler method.By comparing the measured results with the TTU standard model of Oikawa,the key technology and parameter setting of numerical wind tunnel were analyzed and discussed.The feasibility and reliability of the numerical wind tunnel method were verified by comparing with the field observation results of Tsuchiya high-low roof.On this basis,according to the relevant specifications and usage,design analysis models reflecting the proportion of L-shaped double slope roof convex block vertical and horizontal dimensions and the corresponding size ratio of the main body is 1/4,1/2,roof slope Angle as 20°,31°,40°;With wind speed of 5m/s,7.5m/s,10m/s,12.5m/s,and wind Angle of 0°,45°,90°,135°,180°,225°,270°,315°,the distribution law of roof snow was simulated under 192 working conditions,and the dimensionless snow depth of roof snow was introduced to calculate the distribution coefficient of roof snow.At the same time,the body types of houses previously studied by the research group were simply sorted out,summarized and summarized to provide a theoretical basis for anti-snow design.The results show that the numerical simulation method can well simulate the distribution of snow on the roof.The wind direction Angle has a great influence on the distribution of snow cover on the roof.Generally speaking,the degree of snow erosion on the roof in the windward area is greater than that in the leeward area.The degree of snow erosion on the roof in the leeward area is smaller,and some areas in the leeward area appear deposition.With the increase of wind speed,the total amount of snow on the roof decreases.However,with the increase of wind speed,the degree of deposition in the leeward area of the roof also increases at a specific wind direction Angle.The convex transition zone of L-shaped double-slope house will increase the degree of snow deposition on the roof,and the maximum distribution coefficient of snow on the roof in the convex area can reach 1.51,which is higher than that of the double-slope house,and there are safety risks.