Euler–Lagrange study of bubble drag reduction in turbulent channel flow and boundary layer flow

2020 ◽  
Vol 32 (2) ◽  
pp. 027101 ◽  
Keyword(s):  
Boundary Layer ◽  
Drag Reduction ◽  
Channel Flow ◽  
Boundary Layer Flow ◽  
Turbulent Channel Flow ◽  
Layer Flow

Effect of Reynolds number on drag reduction in turbulent boundary layer flow over liquid–gas interface

2020 ◽  
Vol 32 (12) ◽  
pp. 122111
Author(s):  
Hongyuan Li ◽  
SongSong Ji ◽  
Xiangkui Tan ◽  
Zexiang Li ◽  
Yaolei Xiang ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Reynolds Number ◽  
Turbulent Boundary Layer ◽  
Drag Reduction ◽  
Boundary Layer Flow ◽  
Turbulent Boundary Layer Flow ◽  
Layer Flow

Vorticity Modification in a Turbulent Channel Flow by Microbubble Injection

2004 ◽  
Author(s):  
Claudia del C. Gutierrez-Torres ◽  
Jose A. Jimenez-Bernal ◽  
Elvis E. Dominguez-Ontiveros ◽  
Yassin A. Hassan
Keyword(s):  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Drag Reduction ◽  
Channel Flow ◽  
Turbulent Channel Flow

Investigation of the drag reduction phenomenon has been carried out for several years. Several techniques to reduce the drag have been applied and researched for a number of years. Microbubbles injection within a turbulent boundary layer is one method utilized to achieve reduction of drag. In this work, the effects of the presence of microbubbles in the boundary layer of a turbulent channel flow are discussed.

Drag reduction of a zero‐pressure gradient boundary layer flow by surfactants

2018 ◽  
Vol 14 (1) ◽  
pp. e2282 ◽  
Author(s):  
Shu‐peng Cai ◽  
Zhi‐neng Wang ◽  
Chuan‐wei Duan
Keyword(s):  
Boundary Layer ◽  
Pressure Gradient ◽  
Drag Reduction ◽  
Boundary Layer Flow ◽  
Layer Flow

Direct numerical simulation of polymer-induced drag reduction in turbulent boundary layer flow

2005 ◽  
Vol 17 (1) ◽  
pp. 011705 ◽  
Author(s):  
Costas D. Dimitropoulos ◽  
Yves Dubief ◽  
Eric S. G. Shaqfeh ◽  
Parviz Moin ◽  
Sanjiva K. Lele
Keyword(s):  
Numerical Simulation ◽  
Boundary Layer ◽  
Turbulent Boundary Layer ◽  
Direct Numerical Simulation ◽  
Drag Reduction ◽  
Boundary Layer Flow ◽  
Induced Drag ◽  
Turbulent Boundary Layer Flow ◽  
Layer Flow

scholarly journals Drag Reduction of a Turbulent Boundary Layer over an Oscillating Wall and Its Variation with Reynolds Number

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Martin Skote ◽  
Maneesh Mishra ◽  
Yanhua Wu
Keyword(s):  
Boundary Layer ◽  
Reynolds Number ◽  
Turbulent Boundary Layer ◽  
Drag Reduction ◽  
Channel Flow ◽  
Downstream Distance ◽  
The Past ◽  
Layer Flow ◽  
Reynolds Number Dependency ◽  
Downstream Development

Spanwise oscillation applied on the wall under a spatially developing turbulent boundary layer flow is investigated using direct numerical simulation. The temporal wall forcing produces a considerable drag reduction over the region where oscillation occurs. Downstream development of drag reduction is investigated from Reynolds number dependency perspective. An alternative to the previously suggested power-law relation between Reynolds number and peak drag reduction values, which is valid for channel flow as well, is proposed. Considerable deviation in the variation of drag reduction with Reynolds number between different previous investigations of channel flow is found. The shift in velocity profile, which has been used in the past for explaining the diminishing drag reduction at higher Reynolds number for riblets, is investigated. A new predictive formula is derived, replacing the ones found in the literature. Furthermore, unlike for the case of riblets, the shift is varying downstream in the case of wall oscillations, which is a manifestation of the fact that the boundary layer has not reached a new equilibrium over the limited downstream distance in the simulations. Taking this into account, the predictive model agrees well with DNS data. On the other hand, the growth of the boundary layer does not influence the drag reduction prediction.

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