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13th Spring School on Transition and Turbulence
Study of Compressible Direct Numerical Simulations of Tollmien-Schlichting Waves Interacting with Bumps
Ana Elisa Basilio , DF
Co-Authors: Ana Elisa Basilio, Fernando H T Himeno, Marlon Sproesser Mathias, Marcello Augusto Faraco de Medeiros
Presenter: Ana Elisa Basilio
Through Direct Numerical Simulations (DNS), this work investigates the boundary layer stability of two-dimensional TS waves over a smooth plate with a two-dimensional isolated bump immersed in a compressible laminar boundary layer flow. The objective of the current work is to investigate aspects of the linear regime with the DNS code for hydrodynamic instability analysis on different Mach numbers. The numerical simulations were performed by a high order DNS for the compressible Navier-Stokes equations, developed by the Group of Aeroacoustics, Transition and Turbulence (GATT) of the Department of Aeronautical Engineering of the São Carlos School of Engineering, University of São Paulo (EESC-USP). A rectangular bump is positioned on a smooth plate. Five different bumps were defined by their height, proportional to the boundary layer displacement thickness at the position of the center of the bump on the smooth plate, that is, 0.05, 0.10, 0.20, 0.30 and 0.40. Upstream from the bump, there is a region capable of generating disturbances that travel downstream, interacting with the bump. For each height, a different base flow was generated, as well as for each Mach number on the subsonic and transonic regimes, 0.1, 0.3, 0.6, 0.7, 0.8 and 0.9. For each base flow, it was introduced a sinusoidal two-dimensional T-S wave with constant amplitude and frequency.
direct numerical simulation, boundary layer stability, Tollmien-Schlichting waves, Roughness, Bump