Drag Reduction of a Turbulent Boundary Layer over an Oscillating Wall and Its Variation with Reynolds Number
Joint Authors
Skote, Martin
Mishra, Maneesh
Wu, Yanhua
Source
International Journal of Aerospace Engineering
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-12-14
Country of Publication
Egypt
No. of Pages
9
Abstract EN
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.
American Psychological Association (APA)
Skote, Martin& Mishra, Maneesh& Wu, Yanhua. 2015. Drag Reduction of a Turbulent Boundary Layer over an Oscillating Wall and Its Variation with Reynolds Number. International Journal of Aerospace Engineering،Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1064550
Modern Language Association (MLA)
Skote, Martin…[et al.]. Drag Reduction of a Turbulent Boundary Layer over an Oscillating Wall and Its Variation with Reynolds Number. International Journal of Aerospace Engineering No. 2015 (2015), pp.1-9.
https://search.emarefa.net/detail/BIM-1064550
American Medical Association (AMA)
Skote, Martin& Mishra, Maneesh& Wu, Yanhua. Drag Reduction of a Turbulent Boundary Layer over an Oscillating Wall and Its Variation with Reynolds Number. International Journal of Aerospace Engineering. 2015. Vol. 2015, no. 2015, pp.1-9.
https://search.emarefa.net/detail/BIM-1064550
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1064550