Analysis on Turbulent Flows using Large-eddy Simulation on the Seaside Complex Terrain

The Science of Making Torque from Wind 2012

Kamio, T.^1 ; Iida, M.^1 ; Arakawa, C.^1

University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan^1

关键词: Computational domains;    Computational results;    Cross-spectrum analysis;    Power spectrum density;    Science and Technology;    Turbulence characteristics;    Turbulence intensity;    Turbulent characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012058/pdf
DOI  :  10.1088/1742-6596/555/1/012058

来源: IOP

【 摘 要 】

The purpose of this study is the Large-eddy Simulation (LES) of the turbulent wind on the complex terrain, and the first results of the simulation are described. The authors tried to apply the LES code, which was developed as an atmospheric simulator in Japan Agency for the Marine-Earth Science and Technology (JAMSTEC), to the wind prediction for the wind energy. On the wind simulation, the highest problem would be the boundary conditions, and the case in this paper was simplified one. The case study in this paper is the west wind on a complex terrain site, which is the wind from sea for the site. The steady flow was employed for the inlet condition, because the wind on the sea is the low turbulent wind, and almost all the turbulence would be generated by the roughness of the ground surface. The wall function was employed as the surface condition on the ground surface. The computational domain size was about 8 × 3 × 2.5 km3, and the minimum cell size was about 10 × 10 × 3 m3. The computational results, the vertical profile of the averaged wind speed and the turbulence intensity, agreed with the measurement by the meteorological masts. Moreover, the authors tried the analysis of the turbulence characteristics. The power spectrum density model, and the cross spectrum analyses gave the knowledge of the turbulent characteristics on the complex terrain and the hints for the domain and grid of the numerical analysis.