Abstract
The large-eddy simulation code with a finite difference method to predict an unsteady three-dimensional wind field was developed in a Cartesian grid system. The immersed boundary method, which enables us to represent the complex geometry in the Cartesian grid system, was used, and the velocity interpolation near the boundary was carried out with a wall model. The mixed-time scale model was adopted for the sub-grid scale stress. According to Kataoka and Mizuno, the inflow boundary conditions were provided by the turbulence computation. Then, the present code was applied to the turbulence simulation of flow fields over a three-dimensional steep hill. Through the calculations, it was confirmed that the present results agreed well with those obtained by wind tunnel experiments, suggesting that the present code is suitable to predict the basic characteristics in the boundary layer over a complex terrain. More detailed results on the turbulent statistics, including higher order moments were also examined, and it was found that the large-scale fluid motions due to the elongated separation region becomes dominant behind the hill.
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