Abstract
With an aid of the recent development of computers, various direct numerical simulations (DNS) of turbulence were performed. Although the turbulence itself is unsteady in nature, the mean flow is assumed steady in most of the DNS's. This is because the DNS of the turbulence with an unsteady mean flow requires more computational effort to obtain a stable statistical average. In the present study, a pulsating flow driven by temporally periodic pressure gradient is imposed on the turbulent channel flow. The each period is divided into a number of phases and statistical average is obtained for various turbulence quantities.
