NUMERICAL STUDY OF THE EVOLUTION OF DISTURBANCES GENERATED BY ROUGHNESS ELEMENTS IN A SUPERSONIC BOUNDARY LAYER ON A BLUNTED CONE

2019 ◽  
Keyword(s):  
Boundary Layer ◽  
Numerical Study ◽  
Supersonic Boundary Layer ◽  
Roughness Elements

scholarly journals Control of laminar breakdown in a supersonic boundary layer employing streaks

2021 ◽  
Vol 932 ◽  
Author(s):  
Simon Kneer ◽  
Zhengfei Guo ◽  
Markus J. Kloker
Keyword(s):  
Boundary Layer ◽  
Reynolds Number ◽  
Laminar Flow ◽  
Point Source ◽  
Numerical Simulations ◽  
Supersonic Boundary Layer ◽  
Direct Numerical Simulations ◽  
Roughness Elements ◽  
Controlling Mechanism ◽  
Laminar Flow Control

In this study direct numerical simulations are employed to investigate the effects of various parameters on the laminar-flow-control capabilities of narrowly spaced streaks in a supersonic boundary layer at Mach $2.0$ . Previous work by Sharma et al. (J. Fluid Mech., vol. 873, 2019, pp. 1072–1089) has found these streak modes, excited by a spanwise blowing-and-suction strip, to be highly effective at delaying pure oblique-type breakdown. In the present work it is shown that spectrum-enriching subharmonic modes, relevant with increasing running-length Reynolds number, do not destroy the controlling mechanism, and also a complex breakdown scenario, triggered by a multi-frequency point source, is found to be effectively controlled. Moreover, the control-streak excitation by roughness elements is compared in detail with the blowing-and-suction method, revealing relevant differing features.

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