抄録
The VITA method is one of the statistical methods to investigate the coherent motion and the bursting phenomena in the turbulent boundary layer. Some researchers pointed out that the results analyzed by the VITA method contain the invalid detection of the bursting events and the VITA method can hardly capture the dynamic structures in the turbulent boundary layer. However, the reason of the incorrect detection has not been discussed in detail. The present paper focused on the turbulent coherent structure detected by the VITA method. We performed the DNS of channel flow with Re_τ=180 and investigates the characteristics of stochastic technique to capture the bursting phenomena. The numerical results of the present analysis showed that the coherent motion in the turbulent boundary layer was smeared out by the VITA method and those features are not easy to distinguish.
