EVOLUTION OF A SINGLE DISTURBANCE IN A BOUNDARY LAYER WITH A PRESSURE GRADIENT
A.I. Kutepova, D.V. Khotyanovskii, A.A. Sidorenko
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences (ITAM SB RAS), Novosibirsk, Russia
Keywords: direct numerical simulation, disturbance source, local heating, laminar-turbulent transition, supersonic flow
Abstract
The development of a single thermal disturbance in a laminar boundary layer at a Mach number M = 1.43 in the presence of a pressure gradient induced by a shock wave emanating from a wedge with an angle of 2° is investigated using direct numerical simulation. Calculations are performed using the HyCFS-R code developed at the ITAM SB RAS. The evolution of the disturbance is examined in a zero-pressure-gradient boundary layer, during passage through the interaction region, and in the wake. A single thermal disturbance is shown to generate a localized wave packet. Spectral analysis is used to determine the packet composition and its evolution through the interaction zone. The influence of the pressure gradient on disturbance amplification is assessed, and the disturbance development in the boundary-layer-shock-wave interaction region up to the onset of laminar-turbulent transition is analyzed. A comparative analysis is performed for two types of boundary conditions applied at the lateral boundaries of the computational domain. The results show that the combined effect of the thermal disturbance and the shock wave plays a dominant role in boundary-layer destabilization, which should be taken into account in transition control strategies for supersonic flows.
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