Abstract
Various direct numerical simulations (DNS) of turbulence are performed hitherto. In most of those DNS's, the mean flow is assumed to be steady. 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, DNS of turbulent channel flow driven by temporally-changing pressure gradient is performed. The pressure gradient is so determined that the bulk mean velocity averaged over one cycle is approximately equal to the one with a steady state Reynolds number of Reτs= 180. The each period is divided into twenty phases and statistical average is obtained for various turbulence statistics. Obtained turbulence statistics are compared with steady ones. Number of streamwise vortices decreases in the acceleration period while it increases in the deceleration one.
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