The Test Rule And Numerical Simulation Methods Of The Simultaneous Action Of Wind And Rain

Currently, With the realizition of the importance of refinement research,the combined effects of wind and rain in the field of civil engineering is a growing concern scholars from various countries. But for the existing studies, the wind tunnel test which is about the combined effects of wind and rain was lack of theoretical test guidelines and the CFD simulation can not realize the simulation of the combined effects of wind and rain, this paper will put forward the test criteria and the numerical simulation method of the combined effects of wind and rain based on the CFD to provide basic theories and methods for future studies and practical. Specific studies include:(1) Based on two consistency conditions, one is that the similitude ratio of the film is equal to the geometric scale, another is that the attack angles of the nature and the wind and rain research environment are equal, the test criteria in the wind and rain environment is raised. And in the Joint Laboratory of Wind Tunnel and Wave Flume of the Harbin Institute of Technology, using the sprinkler, finish the test parameters of the wind and rain experiment about the Great Belt bridge in the Denmark, and then verify the Test Guidelines The feasibility.(2) The formula is derived to obtain the relationship between the conversion formula rain rainfall intensity and mass flow rate of the particle stream; relying FLUENT software platform, the Rosin-Rammler function method and UDF Function Simulation method are proposed to reproduce the raindrop size distribution. In terms of rainfall intensity and raindrop size reproductio n based on the establishment of a numerical simulation based on two parameters of the storm coupled field approach and through specific examples, compare the pros and cons of three simulation methods Raindrop found: the simulation results UDF Function Simulation rain fieldare more objective, but the operation is complex, and simulation speed and fidelity of the discrete multi-injection method is worst, while Rosin-Rammler function method in between.(3) Based on the EWF model and the Euler-Lagrange discrete phase models, and combined with the dynamic mesh, set up the combined effects of wind and rain simulation methods for the structure. And using the method of numerical simulation to carry on the research of the stay cable in the wind and rain, compared with the experimental results to verify the validity of the numerical methods. At the same time, the results of numerical simulation model show: the film on the cable-stayed wall will form the upper and lower rivulet and the boundary of the rivulet is clear. The oscillations of the rivulet are obvious. Relatively fixed position and thickness of the water lines, the overall shape of the waterline wide trapezoidal shape; the ove rall shape of the water line the narrow, triangular in shape. Position with respect to the water line was central symmetrical axis inclined cable.