Direct Numerical Simulation of the Transition to Turbulence in a Supersonic Boundary Layer on Smooth and Rough Surfaces
D. V. Khotyanovsky, A. N. Kudryavtsev
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: прямое численное моделирование, ламинарно-турбулентный переход, сверхзвуковой пограничный слой, распределенная шероховатость, direct numerical simulation, laminar-turbulent transition, supersonic boundary layer, distributed roughness
Abstract
Direct numerical simulations of instability development and transition to turbulence in a supersonic boundary layer on a flat plate are performed. The computations are carried out for moderate supersonic (free-stream Mach number M = 2) and hypersonic (M = 6) velocities. The boundary layer development is simulated, which includes the stages of linear growth of disturbances, their nonlinear interaction, stochastization, and turbulent flow formation. A laminar-turbulent transition initiated by distributed roughness of the plate surface at the Mach number M=2 is considered.
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