Development of a numerical analysis system of wind field over complex terrain

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The objectives of the present research are to develop a numerical and experimental method to predict the wind environment over complex terrain. For the numerical method, we have focused on the development of grid generation method for complex terrain, a method for computing high Reynolds number flows, such as LES, and a technique for boundary conditions for the inlet and ground. As the results, we have successfully developed a method for grid generation, by using a rectangular grid approximation technique, which enable us to generate a computational grid easily and effectively. This method will be very useful in a new feature, because the computer ability will develop year by year. A LES method has been employed to simulate high Reynolds number flows. Among turbulence models, LES is a most hopeful method for the simulation turbulence field. For the boundary conditions, to give suitable turbulent conditions at the entrance of the computer domain, we have adopted a pre-domain method to compute the turbulent inflows. For the wind tunnel experiment, mean-velocity measurement and flow visualization experiment of the flow over complex terrain was carried out to compare the results with those in numerical analyses. Both results show almost good agreement except for the region near ground.To sum up, although there still remain a couple of problems both in numerical and experimental method for the prediction of wind environment over complex terrain, a system consisting of the numerical analysis and wind tunnel experiment has been successfully developed.