Dependence of turbulent wall-shear stress on the amplitude of spanwise transversal surface waves

被引:19
|
作者
Koh, S. R. [1 ]
Meysonnat, P. [1 ]
Statnikov, V. [1 ]
Meinke, M. [1 ]
Schroeder, W. [1 ]
机构
[1] Rhein Westfal TH Aachen, Inst Aerodynam, Aachen, Germany
关键词
Drag reduction; Transversal traveling waves; Large-eddy simulation; LARGE-EDDY SIMULATION; DRAG-REDUCTION; BOUNDARY-LAYER; FLOWS; MECHANISMS; MOTION;
D O I
10.1016/j.compfluid.2015.06.021
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
Large-eddy simulations of turbulent boundary layer flow over a flat plate whose surface is actuated by spanwise traveling transversal waves are performed. Although it is known that moving surfaces can result in drag reduction compared to the non-actuated flow problem, it is an open question whether the drag reduction depends monotonically on the parameters defining the transversal wave of the surface, i.e., the amplitude A(+), the wavelength lambda(+), and the period T+. It is the purpose of this study, to analyze the dependence of the drag reduction on the amplitude A(+) in an extended Reynolds number range while the other wave parameters are kept constant. To be more precise, the analysis is based on the amplitudes A(+) = 30, 50, and 70 and the Reynolds numbers based on the momentum thickness Re-theta = 2000, 5000, and 7000. The results show that the drag reduction decreases at increasing Reynolds number. The maximum drag reduction is 11.4%. Furthermore, independently from the Reynolds number the local wall-shear stress is lowered at higher wave amplitude. However, the analysis of the drag reduction, which is defined by the wall-shear stress integrated over the surface area, evidences an optimum amplitude to exist due to the variation of the area as a function of the amplitude. This is shown for Re-theta = 2000, where the drag reduction for A(+) = 50 is higher than for A(+) = 30 and A(+) = 70. The results further indicate that unlike for flows over non-actuated surfaces the friction drag above actuated surfaces no longer scales in inner units. (c) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码:261 / 275
页数:15
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