Studies On The Experiment In The Wind Tunnel And Numerical Simulation Of The Sinusoidal Wind Spectrum

This paper is based on the control equation of the atmospheric boundary layer, according to the similar law, and the realizable possibility of the similar principles that are satisfied with the similar theory is analyzed. Using the wind tunnel for the atmospheric boundary layer as the tools and the way of the natural development, the mean velocity profile of the atmospheric boundary layer is simulated in thewind tunnel. The proper range of the two important parameters------the height of the obstacles and thedistance between the obstacles and the measured point in the experiment is recommended.The gust is the mainly behavior form of the atmospheric movement on earth's surface, and the gust can be seen as the combination of a lot of the sinusoidal wind spectrum with different frequency and different swing. So the simulation using wind tunnel and CFD program for the sinusoidal wind spectrum is an important fundamental project. The sinusoidal wind spectrum is simulated in the wind tunnel in this paper; the time lag is analyzed, the maximal lag time of the sinusoidal wind spectrum in the simulation is given.The program of Calculational Fluid Dynamics (CFD) and the way of the numerical simulation isused to simulated the atmospheric boundary layer, the correctness of the two important parameters------the height of the obstacles and the distance between the obstacles and the measured point, which is given in the experimental process of simulating the atmospheric boundary layer, is verified. Then basing on this conclusion, the profile turbulent characteristic of the sinusoidal wind spectrum is further simulated, and the variational laws of the mean velocity, turbulent kinetic energy k and dissipation ration ?are given and analyzed theoretically.