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KAMETANI YUKINORI
Department Undergraduate School , School of Science and Technology Position Senior Assistant Professor |
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| Language | English |
| Publication Date | 2011/08 |
| Type | Academic Journal |
| Peer Review | Peer reviewed |
| Title | Direct numerical simulation of spatially developing turbulent boundary layers with uniform blowing or suction |
| Contribution Type | Co-authored (first author) |
| Journal | Journal of Fluid Mechanics |
| Journal Type | Another Country |
| Publisher | CAMBRIDGE UNIV PRESS |
| Volume, Issue, Page | 681,pp.154-172 |
| Author and coauthor | ◎Yukinori Kametani, Koji Fukagata |
| Details | Direct numerical simulation (DNS) of spatially developing turbulent boundary layer with uniform blowing (UB) or uniform suction (US) is performed aiming at skin friction drag reduction. The Reynolds number based on the free stream velocity and the 99% boundary layer thickness at the inlet is set to be 3000. A constant wall-normal velocity is applied on the wall in the range,-'0.01U∞ ≤ Vctr ≤ 0.01U ∞. The DNS results show that UB reduces the skin friction drag, while US increases it. The turbulent fluctuations exhibit the opposite trend. Dynamical decomposition of the local skin friction coefficient using the identity equation (FIK identity, Fukagata et al., 2002) reveals that the mean convection term in UB case works as a strong drag reduction factor, while that in US case works as a strong drag augmentation factor. It is also found that the control efficiency of UB is much higher than that of the advanced active control methods proposed for channel flows. |
| DOI | 10.1017/jfm.2011.219 |
| ISSN | 0022-1120 |