カメタニ　ユキノリ   KAMETANI YUKINORI   亀谷　幸憲    所属   明治大学  理工学部    職種   専任講師
言語種別	英語
発行・発表の年月	2012
形態種別	学術雑誌
査読	査読あり
招待論文	招待あり
標題	Direct numerical simulation of spatially developing turbulent boundary layer for skin friction drag reduction by wall surface-heating or cooling
執筆形態	共著(筆頭者)
掲載誌名	Journal of Turbulence
掲載区分	国外
出版社・発行元	Taylor & Francis LTD
著者・共著者	◎Yukinori Kametani, Koji Fukagata
概要	Direct numerical simulation (DNS) of zero-pressure-gradient spatially developing tur- bulent boundary layer with uniform heating (UH) or cooling (UC) is performed aiming at skin friction drag reduction. A constant temperature is imposed on the wall. The DNS results show that UC reduces skin friction drag with a maximum drag reduction rate of 65%, while UH enhances it. Dynamical decomposition of skin friction drag using the identity equation (FIK identity, discussed by Fukagata et al. in 2002) quantitatively shows that drag reduction by UC is due to reduced Reynolds shear stress (RSS), while drag increase by UH is augmentation of RSS. The control efficiency of UC, however, is found to be largely negative; namely, net power saving is not achieved.