dc.contributor.authorSkote, Martin
dc.contributor.authorMishra, Maneesh
dc.contributor.authorWu, Yanhua
dc.identifier.citationSkote, M., Mishra, M., & Wu, Y. (2015). Drag Reduction of a Turbulent Boundary Layer over an Oscillating Wall and Its Variation with Reynolds Number. International Journal of Aerospace Engineering, 2015, 891037-.en_US
dc.description.abstractSpanwise 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.en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.format.extent9 p.en_US
dc.relation.ispartofseriesInternational Journal of Aerospace Engineeringen_US
dc.rights© 2015 Martin Skote et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.en_US
dc.subjectMechanical and Aerospace Engineering
dc.titleDrag Reduction of a Turbulent Boundary Layer over an Oscillating Wall and Its Variation with Reynolds Numberen_US
dc.typeJournal Article
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.description.versionPublished versionen_US

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