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	2017/12
形態種別	学術雑誌
査読	査読あり
標題	Drag reduction capability of uniform blowing in supersonic wall-bounded turbulent flows
執筆形態	共著(筆頭者)
掲載誌名	Physical Review Fluids
掲載区分	国外
出版社・発行元	AMER PHYSICAL SOC
巻・号・頁	2(12)
著者・共著者	◎Yukinori Kametani, Ayane Kotake, Koji Fukagata, Naoko Tokugawa
概要	Drag reduction capability of uniform blowing in supersonic turbulent boundary layers is investigated by means of direct numerical simulation of channel flows with uniform blowing on one side and suction on the other. The bulk Reynolds number based on the bulk density, the bulk mean velocity, the channel half-width, and the viscosity on the wall is set to Reb=3000. The bulk Mach number is set at 0.8 and 1.5 to investigate a subsonic and a supersonic condition, respectively. The amplitude of the blowing or suction is set to be 0.1%, 0.3%, or 0.5% of the bulk mass flow rate. At both Mach numbers, modifications of the mean streamwise velocity profiles with blowing and suction are found to be similar to those in an incompressible turbulent channel flow: The skin friction is reduced on the blowing side, while it is increased on the suction side. A noticeable Mach number effect is found only for the contribution terms containing the viscosity, which is increased by the increased temperature.
DOI	10.1103/PhysRevFluids.2.123904
ISSN	2469-990X