乱流境界層内の測定データを用いた風速変動の時空間シミュレーション

Abstract

Today the progress of computational calculation gives us some tools to predict wind characteristics around bodies. These are sometimes available for practical use particularly on the study of steady flow. On the other hand the simulation methods of timedependent flow phenomena such as wind fluctuation, eddy motion, vibration of bodies and so on are still in their early stages, but they are very important to know the unsteady turbulent flow.If we want to simulate the unsteady flow in the test section numerically, we need the time series information of wind velocity at the upwind boundary, because the up-wind boundary condition has some effect on the flow field behind. We present the numerical method to generate the fluctuation of streamwise velocity component at the upwind boundary using the measured data.