C314 壁乱流フィードバック制御に対する非線形相互作用の影響

概要

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Direct numerical simulation of turbulent channel flow at (Re)_τ=110∿650 was made in order to evaluate feedback control algorithms for reducing skin friction. The energy efficiency of the v-control and suboptimal control is deteriorated with increasing Reynolds number. It is found through the Karhunen-Loeve decomposition of the turbulent fluctuations that the structures having large contribution to the turbulent kinetic energy are of large scale, whilst the structures having large contribution to the wall shear stress fluctuation are scaled with viscous units and accompanied with the quasi-streamwise vortices near the wall. The KL modes are divided into groups depending on the wall elevation of the structures, and the nonlinear interaction between those structures are examined. It is indicated that the interaction effect is larger at higher Reynolds numbers, but the near-wall vortices are not much affected by the interaction with the large-scale outer structures.
日本流体力学会の論文
2001-07-31