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Numerical study of wave packets over a flat plate with roughness

Grant number: 18/02542-9
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2018
Effective date (End): July 31, 2022
Field of knowledge:Engineering - Aerospace Engineering - Aerodynamics
Principal Investigator:Marcello Augusto Faraco de Medeiros
Grantee:Fernando Henrique Tadashi Himeno
Host Institution: Escola de Engenharia de São Carlos (EESC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


The transition from laminar to turbulent flow is a very important phenomena in Fluid Mechanics. Since Reynolds's experiments, this topic remains an important focus of research that is not fully understood due to the complexity of the phenomena involved and its dependence on several parameters. 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 with roughness immersed in a compressible 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. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
HIMENO, FERNANDO H. T.; SOUZA, DANIEL S.; AMARAL, FILIPE R.; RODRIGUEZ, DANIEL; MEDEIROS, MARCELLO A. F.. SPOD analysis of noise-generating Rossiter modes in a slat with and without a bulb seal. JOURNAL OF FLUID MECHANICS, v. 915, . (16/02970-5, 06/52568-7, 19/02203-2, 18/02542-9)
SOUZA, DANIEL S.; RODRIGUEZ, DANIEL; HIMENO, FERNANDO H. T.; MEDEIROS, MARCELLO A. F.. Dynamics of the large-scale structures and associated noise emission in airfoil slats. JOURNAL OF FLUID MECHANICS, v. 875, p. 1004-1034, . (16/02970-5, 18/02542-9, 06/52568-7)
MARTINEZ, A. G.; HIMENO, F. H. T.; MATHIAS, M. S.; MEDEIROS, M. A. F.; SHERWIN, S; SCHMID, P; WU, X. On Subharmonic Resonance and Other Nonlinear Mechanisms in Wavepackets in Boundary Layers. IUTAM LAMINAR-TURBULENT TRANSITION, v. 38, p. 9-pg., . (18/04584-0, 18/02542-9)

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