流入境界面における乱流統計量の違いがLESによる乱流境界層の計算に及ぼす影響について

Abstract

A method of numerical generation of wind fluctuations was reviewed. According to its procedure a series of inflow wind fluctuations were artificially generated as inlet boundary conditions. Using these signals a turbulent boundary layer at high Reynolds number developed over a rough surface was calculated by Large Eddy Simulation. Numerical simulations were carried out using some inflows which had different characteristics on statistical quantities and the influence of turbulence characteristics were examined. In order to reproduce appropriate mean flow field, the generated and the experimental wind fluctuations should be equivalent in statistical property, i.e. the mean value, the variance and the power spectrum density. The realization of spatially correlated fluctuation of three wind components will lead the simulation to more realistic results.