NUMERICAL STUDY OF THE EVOLUTION OF DISTURBANCES GENERATED BY ROUGHNESS ELEMENTS IN A SUPERSONIC BOUNDARY LAYER ON A BLUNTED CONE
D. V. Khotyanovsky1,2, S. V. Kirilovskiy1,2, T. V. Poplavskaya1,2, A. N. Kudryavtsev1,2
1Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
Keywords: прямое численное моделирование, ламинарно-турбулентный переход, сверхзвуковой пограничный слой, распределенная и одиночная шероховатость, затупленное коническое тело, direct numerical simulation, laminar-turbulent transition, supersonic boundary layer, distributed roughness, individual roughness elements, blunted conical body
Abstract
Results of direct numerical simulations of the roughness-induced development of instability and transition to turbulence in a supersonic boundary layer on a blunted cone for the free-stream Mach number M¥ = 5.95 are presented. The flow parameters and model geometry are consistent with the conditions of the experiments performed in the study. The following roughness types are considered: random distributed roughness, individual roughness elements of different shapes, and a group of regularly arranged roughness elements. The processes of the instability development and transition for different roughness types are compared, and possible mechanisms of the roughness influence on the stability of boundary layers on blunted bodies are discussed.
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