Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Compressible Direct Numerical Simulation of Tollmien-Schlichting Waves Interacting With a Two-Dimensional Isolated Roughness
Submission Author:
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
doi://10.26678/ABCM.COBEM2021.COB2021-1973
Abstract
Through Direct Numerical Simulations (DNS), this work investigates the boundary layer stability of two-dimensional Tollmien-Schlichting (TS) waves over a flat plate with a two-dimensional isolated roughness element immersed in a compressible laminar boundary layer flow. The rectangular roughness height was defined as 10% of the boundary layer displacement thickness at the position of the center of the roughness on a flat plate. Upstream from the roughness, there is a region capable of generating disturbances that travel downstream, interacting with the roughness. Different base flows for each Mach number were generated on the subsonic and transonic regimes, then sinusoidal two-dimensional TS waves were inserted with constant amplitudes and frequencies. Through hydrodynamic stability analysis, the roughness influence on the evolution of the TS waves shows greater amplitudes downstream, and increasing Mach numbers decrease the minimum critical Reynolds number.
Keywords
direct numerical simulation, Roughness, Tollmien-Schlichting waves, boundary layer stability
