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	2016/10
形態種別	学術雑誌
査読	査読あり
標題	Drag reduction in spatially developing turbulent boundary layers by spatially intermittent blowing at constant mass-flux
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
巻・号・頁	17(10),pp.913-929
著者・共著者	◎Yukinori Kametani, Koji Fukagata, Ramis Örlü, Philipp Schlatter
概要	A series of large-eddy simulations of spatially developing turbulent boundary layers with uniform blowing at moderate Reynolds numbers (based on free-stream velocity, U∞, and momentum thickness, θ) up to Reθ ≈ 2500 were performed with the special focus on the effect of intermittent (separated in streamwise direction) blowing sections. The number of blowing sections, N, investigated is set to be 3, 6, 20, 30 and compared to N = 1, which constitutes the reference case, while the total wall-mass flux is constrained to be the same for all considered cases, corresponding to a blowing amplitude of 0.1% of U∞ for the reference case. Results indicate that the reference case provides a net-energy saving rate of around 18%, which initially decreases at most 2% points for N = 3 but recovers with increasing N, where the initial reduction of the drag reduction is found to be related to the shorter streamwise length of the intermittent blowing sections.
DOI	10.1080/14685248.2016.1192285
ISSN	1468-5248