Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
DIRECT NUMERICAL SIMULATION OF WAVE PACKETS OVER A ROUGH FLAT PLATE
Submission Author:
Fernando H T Himeno , SP
Co-Authors:
Fernando H T Himeno, Marlon Sproesser Mathias, Marcello Augusto Faraco de Medeiros
Presenter: Marcello Augusto Faraco de Medeiros
doi://10.26678/ABCM.COBEM2019.COB2019-1154
Abstract
The turbulent flow is characterized by drag increase relative to the laminar. Thus, in aeronautical applications, the greater the region with turbulent flow, the greater the fuel consumption and, consequently, the lower its payload. In this way, the understanding of the transition phenomena means greater precision in the prediction of the aircraft drag and the possibility of surface optimization to obtain a greater laminar region. In this sense, this work proposes the study of the natural transition mechanism that occurs on real surfaces. In order to conduct this study, it is proposed the use of a DNS (Direct Numerical Simulation) code developed by this group, to simulate a flat plate immersed in an incompressible subsonic flow on which a perturbation is introduced in the form of wave packets. The choice of wave packets lies in the quest to approach the natural transition. This comes from the fact that the wave packets are composed of a large number of oscillation modes and not just by two or three as done in most boundary layer transition studies. Furthermore, some studies present that the natural transition displays wave packets that lead to turbulent spots formation.
Keywords
Wave packets, DNS, Roughness
