Numerical Simulation Analysis Of The Snowdrift Movement Affect The Snow Load Distribution On The Roof

In large span, light building complex roof shape, roof snow load sensitivity is greatly enhanced. Snow load has become one of the main load controls of this type of building design. In the process of natural snow, wind flow by the roof shape of the snow produce uneven distribution, resulting roofing local snow load is too large, resulting in the roof structure failure phenomenon more and more people’s attention. Wind-induced snow for the air to carry running snow particles atypical two-phase flow. They formed snow depth is generally natural uniform distribution snow2-8times. How to calculate snowdrift snow load on the building roof, has become one of the hot issues of concern in construction and engineering sectors.Snowdrift carries large amounts of snow particles, often in the course of the campaign by the impact of a variety of terrain, terrain weaker accumulation. When the biasing force of the air becomes small, the movement of the snow particles wills downward movement under the action of gravity, and deposit formation occurs in local area snow. Therefore the wind that directly affect the air flow field distribution in the roof of the building to the deposition of the snow particles position, air flow velocity field and roof wind pressure changes also on the amount of snow particles deposited impact. In addition, the density of the snow will as a series of natural and objective factors, such as snow accumulation of position and depth of changes, which directly affect the snow loadDue to the wind in the building surface formed by the turbulent flow field is very complex, theoretical methods are difficult to solve complex flow problems. The wind tunnel experimental study and there are time-consuming, laborious, and the high cost of the actual problem. As computer technology continues to improve, the increasing development of the turbulence model simulation technology and perfect wind tunnel tests using computer simulation technology matures, has gradually become a powerful means to solve the problem of the structure of wind engineering. This paper is the application of this method to the calculation of the blizzard two-phase study, carried out on the building roof to arrive at the distribution of the complexity of a large area of roof snow load changes.In this paper, computational fluid dynamics software FLUENT, the accumulation of snow particles by simulating the building roof in different wind directions, wind speed combination of conditions, analysis of the distribution of snow and snow load. And produce changes in snow density factors for indoor heating simulation calculation to find snow load change impact coefficients. Also specifically addressed the application of the basic theory of simulation, calculation methods, solving parameter settings and model selection. Custom3D building roofing, snow gas-solid flow simulation, and compare the roof of the various parts of the snow, the snow load calculation value and the actual snow cover, snow load standard value of the difference of the calculated results with the actual situation the reason for the difference, and to identify the law of adjustment. Prove feasibility of snow two-phase flow calculation using computational fluid dynamics method.