Flow control using the parabolized stability equations

• Grant number: 16/25187-4
• Support Opportunities: Scholarships in Brazil - Doctorate
• Start date: June 01, 2017
• End date: March 31, 2019
• Field of knowledge: Engineering - Aerospace Engineering - Aerodynamics
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: André Valdetaro Gomes Cavalieri
• Grantee: Kenzo Sasaki
• Host Institution: Divisão de Engenharia Aeronáutica (IEA). Instituto Tecnológico de Aeronáutica (ITA). São José dos Campos , SP, Brazil

Abstract

This project deals with the active, closed-loop control of flows, with the objective of reducing the fluctuations of the fluidic variables at a given objective position. It is made use of the parabolized stability equations in order to construct reduced-order models in the form of transfer functions which are then able to reproduce both the open-loop behaviour of the system, along with the effect of an actuator. Two classes of problems will be evaluated; Sheared flows, mixing layers and turbulent jets, which have an aeroacoustic appeal, given that the objective of the control law is related to the reduction of acoustic emissions to the far-field. The second type of problem corresponds to boundary layers, in two and three dimensions. For this case, the control has the main objective of postponing the transition to turbulence, maintaining the flow in a laminar condition and, therefore, leading to a reduction in the friction drag coefficient. The focus of this work lies on the definition of the control laws and modelling of the systems, whereas the implementation of the techniques in the respective non-linear systems, whether these are made via simulation or experiment, will be realized in a partnership with other research groups. (AU)

Scientific publications

(5)

(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)

SASAKI, KENZO; CAVALIERI, ANDRE V. G.; JORDAN, PETER; SCHMIDT, OLIVER T.; COLONIUS, TIM; BRES, GUILLAUME A.. High-frequency wavepackets in turbulent jets. JOURNAL OF FLUID MECHANICS, v. 830, NOV 2017. (16/25187-4)

SASAKI, KENZO; TISSOT, GILLES; CAVALIERI, ANDRE V. G.; SILVESTRE, FLAVIO J.; JORDAN, PETER; BIAU, DAMIEN. Closed-loop control of a free shear flow: a framework using the parabolized stability equations. THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS, v. 32, n. 6, p. 765-788, DEC 2018. (16/25187-4)

MORRA, PIERLUIGI; SASAKI, KENZO; HANI, ARDESHIR; CAVALIERI, ANDRE V. G.; HENNINGSON, DAN S.. A realizable data-driven approach to delay bypass transition with control theory. JOURNAL OF FLUID MECHANICS, v. 883, JAN 25 2020. (16/25187-4)

SASAKI, KENZO; MORRA, PIERLUIGI; CAVALIERI, ANDRE V. G.; HANI, ARDESHIR; HENNINGSON, DAN S.. On the role of actuation for the control of streaky structures in boundary layers. JOURNAL OF FLUID MECHANICS, v. 883, JAN 25 2020. (19/13393-7, 16/25187-4)

SASAKI, KENZO; VINUESA, RICARDO; CAVALIERI, ANDRE V. G.; SCHLATTER, PHILIPP; HENNINGSON, DAN S.. Transfer functions for flow predictions in wall-bounded turbulence. JOURNAL OF FLUID MECHANICS, v. 864, p. 708-745, APR 10 2019. (16/25187-4)