円柱まわりの流れの三次元数値シミュレーション : 第2報, 三次元流れの可視化〔流体工学, 流体機械〕

抄録

Three dimensional flow field around a circular cylinder was analyzed by using a third-order upwind finite-difference method for Reynolds number-1000. Instantaneous flow fields were visualized and investigated in relation to the analysis of time and space correlation reported previously. It was found that beat frequency of drag force corresponds to the phenomena that the streamwise position of Karman vortex near wake moves back and forth. Streamwise vortex pairs around separation line deform primary vortices in the near wake and made secondary streamwise vortices. The three dimensional vortices around separation line influence the separation angle.