Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 12, 2016 - November 13, 2016
The objective of the present study is to elucidate the drag reduction mechanism by the suboptimal control for turbulent friction drag reduction by conducting the resolvent analysis. In the analysis, the turbulent velocity field is expressed as a linear superposition of propagating modes, identified via a gain-based decomposition of the Navier-Stokes equations. This decomposition enables targeted analyses of the effects of control on coherent turbulent structures such as the near-wall cycle (NW-modes) and very-large-scale motions (VLSMs). In the present study, we investigate the effect of suboptimal control on these turbulent structures.
