Abstract
The VITA method is one of the stochastic 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 reveals the problems of the VITA method and improves the stochastic technique to capture the bursting phenomena accurately. The features of the present method are to compute the VITA quantities based on the coherent motion in the turbulent boundary layer. The analyzed result shows that the erroneous detection is removed and the bursting phenomena are captured appropriately. The present method can easily incorporate the VITA quantities to the quadrant analysis and the QV burst method is newly proposed. The present method can clearly capture the ensemble averaged waveform of the bursting phenomena rather than the Q burst method.
