特集7 : 研究解説 : LES Analysis on Turbulent Flow past 2D Square Cylinder using Various Dynamic SGS Models

A turbulent vortex shedding flow past a two dimensional (2D) square cylinder at Re=2.2×104 was analyzed by Large Eddy Simutation (LES) using various dynamic subgrid-scale (SGS) models. Here, 7 cases of computations were carried out using three different computational grids, two different grid systems and four different SGS models. Results from these computations were compared with those from the experiment by Lyn and Rodi. The Lagrangian Dynamic Mixed (LDM) model provided very good results in the four SGS models compared here. Furthermore, a method for stabilization by averaging over particle trajectories employed in the LDM model contributed to a remarkable improvement of computation stability.特集 乱流の数値シミュレーション(NST)その1

Generation of Inflow Turbulence of LES based on 3D Energy Spectrum in Wave Number Space

特集 乱流の数値シミュレーション(NST)その1

各種Dynamic SGSモデルによる2次元角柱周辺流れのLES解析

A turbulent vortex shedding flow past a two dimensional (2D) square cylinder at Re=2.2×104 was analyzed by Large Eddy Simutation (LES) using various dynamic subgrid-scale (SGS) models. Here, 7 cases of computations were carried out using three different computational grids, two different grid systems and four different SGS models. Results from these computations were compared with those from the experiment by Lyn and Rodi. The Lagrangian Dynamic Mixed (LDM) model provided very good results in the four SGS models compared here. Furthermore, a method for stabilization by averaging over particle trajectories employed in the LDM model contributed to a remarkable improvement of computation stability.特集 乱流の数値シミュレーション(NST)その1

LES Analysis of Non-Isothermal Flow in an Enclosed Space with Vertical Cold Jet using Dynamic SGS Model

特集 乱流の数値シミュレーション(NST)その1

Study of Change in the Velocity of Seixmic Waves in the Southern Kanto Area by Tateyama Explosions

During the period of 1971-1973, seismic waves generated with explosions of 800 kg dynamite near Tateyama on the Boso Peninsula were observed once a year at about 10 temporary stations as well as permanent seismological stations of the Dodaira Microearthquake Observatory to detect changes in the velocity of seismic waves in the southern part of the Kanto District. Attention was specially paid to repeat experiments under not only the same source conditions but also the same observation conditions. Analysis of travel times did not indicate any significant change in the velocity of seismic waves in the period 1971-1973. However, the data obtained gives a basis for future experiments