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Energies 2016, 9(3), 154; doi:10.3390/en9030154

Direct Numerical Simulation of Supersonic Turbulent Boundary Layer with Spanwise Wall Oscillation

1,†
,
1,†
,
2,†
and
1,3,†,*
1
National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics, School of Energy and Power Engineering, Beihang University, 37 Xueyuan Road, Haidian District, Beijing 100191, China
2
Laboratoire de Mécanique Des Fluides (LMFA), Ecole Centrale de Lyon (ECL), Unité Mixte de Recherche (UMR) 5509, 36, avenue Guy de Cloongue, 69130 Ecully, France
3
Computer Science and Engineering Department, Science & Technology Facilities Council (STFC), Daresbury Laboratory, Warrington WA4 4AD, UK
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Enrico Sciubba
Received: 7 December 2015 / Revised: 23 February 2016 / Accepted: 23 February 2016 / Published: 3 March 2016

Abstract

Direct numerical simulations (DNS) of Mach = 2.9 supersonic turbulent boundary layers with spanwise wall oscillation (SWO) are conducted to investigate the turbulent heat transport mechanism and its relation with the turbulent momentum transport. The turbulent coherent structures are suppressed by SWO and the drag is reduced. Although the velocity and temperature statistics are disturbed by SWO differently, the turbulence transports of momentum and heat are simultaneously suppressed. The Reynolds analogy and the strong Reynolds analogy are also preserved in all the controlled flows, proving the consistent mechanisms of momentum transport and heat transport in the turbulent boundary layer with SWO. Despite the extra dissipation and heat induced by SWO, a net wall heat flux reduction can be achieved with the proper selected SWO parameters. The consistent mechanism of momentum and heat transports supports the application of turbulent drag reduction technologies to wall heat flux controls in high-speed vehicles. View Full-Text
Keywords: direct numerical simulation; turbulent heat transport; wall heat flux; spanwise wall oscillation direct numerical simulation; turbulent heat transport; wall heat flux; spanwise wall oscillation
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. (CC BY 4.0).

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MDPI and ACS Style

Ni, W.; Lu, L.; Ribault, C.L.; Fang, J. Direct Numerical Simulation of Supersonic Turbulent Boundary Layer with Spanwise Wall Oscillation. Energies 2016, 9, 154.

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