Simulations of laminar boundary-layer flow encountering large-scale surface indentions

被引:4
作者
Beratlis, N. [1 ]
Balaras, E. [2 ]
Squires, K. [1 ]
Vizard, A. [2 ]
机构
[1] Arizona State Univ, Sch Engn Matter Transport & Energy, POB 876106, Tempe, AZ 85287 USA
[2] George Washington Univ, Dept Mech & Aerosp Engn, SEH 3000,800 22nd St NW, Washington, DC 20052 USA
关键词
HIGH REYNOLDS-NUMBERS; ROUGHNESS ELEMENTS; CIRCULAR-CYLINDER; HAIRPIN VORTICES; DIMPLES; SPHERE; TURBULENCE; GROOVES; VORTEX;
D O I
10.1063/1.4943664
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
The transition from laminar to turbulent flow over dimples and grooves has been investigated through a series of direct numerical simulations. Emphasis has been given to the mechanism of transition and the momentum transport in the post-dimple boundary layer. It has been found that the dimple geometry plays an important role in the evolution of the turbulent boundary layer downstream. The mechanism of transition in all cases is that of the reorientation of the spanwise vorticity into streamwise oriented structures resembling hairpin vortices commonly encountered in wall bounded turbulent flows. Although qualitatively the transition mechanism amongst the three different cases is similar, important quantitative differences exist. It was shown that two-dimensional geometries like a groove are more stable than three-dimensional geometries like a dimple. In addition, it was found that the cavity geometry controls the initial thickness of the boundary layer and practically results in a shift of the virtual origin of the turbulent boundary layer. Important differences in the momentum transport downstream of the dimples exist but in all cases the boundary layer grows in a self-similar manner. (C) 2016 AIP Publishing LLC.
引用
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页数:16
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