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	2020
形態種別	学術雑誌
査読	査読あり
標題	Dissimilarity between turbulent heat and momentum transfer induced by a streamwise travelling wave of wall blowing and suction
執筆形態	共著(筆頭者以外)
掲載誌名	Journal of Fluid Mechanics
掲載区分	国外
出版社・発行元	CAMBRIDGE UNIV PRESS
巻・号・頁	886
著者・共著者	Arjun J. Kaithakkal, Yukinori Kametani, Yosuke Hasegawa
概要	A series of direct numerical simulations of a fully developed turbulent channel flow is conducted in order to clarify the effects of travelling wave-like wall blowing and suction on dissimilar heat transfer enhancement. While the wave form is kept sinusoidal and its amplitude is set to be 5 % of the bulk mean velocity, the wavelength and phase speed of the travelling wave are systematically changed in a wide parameter space. As a result, the global optimum of the parameter set for maximizing the analogy factor, which is defined as the ratio between the Stanton number and the skin-friction coefficient, is identified. Interestingly, the obtained globally optimal mode agrees well with that predicted from the optimal control theory taking into account the future dynamics within a limited time horizon by Yamamoto et al. (J. Fluid Mech., vol. 733, 2013, pp. 189-220).
DOI	10.1017/jfm.2019.1045
ISSN	0022-1120