抄録
Turbulent pipe flow controlled by the opposition control algorithm [J. Fluid Mech. 262 (1994) 75-110] is studied by means of direct numerical simulation. A special focus is laid upon a scheme in which the control input is applied only partially over a limited length in the streamwise direction, but not on the entire wall surface. The upstream control effect remains over a distance of about 11-14 times the pipe radius downstream of the point where the control is terminated. This results, however, in a simple relationship that the average drag reduction rate is nearly proportional to the control length. The recovery process after the control termination is quantitatively investigated by applying a recently proposed exact relation between the skin friction and the Reynolds stress distribution [Phys. Fluids 14 (11) (2002) L73-L76] and also by performing a budget analysis specially designed for that purpose.
本文言語 | English |
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ページ(範囲) | 480-490 |
ページ数 | 11 |
ジャーナル | International Journal of Heat and Fluid Flow |
巻 | 24 |
号 | 4 |
DOI | |
出版ステータス | Published - 2003 8月 |
外部発表 | はい |
ASJC Scopus subject areas
- 凝縮系物理学
- 機械工学
- 流体および伝熱