Introduction Exp Fluids (2013) 54:1565 DOI 10.1007/s00348-013-1565-8 EDITORIAL Louis Cattafesta Jean-Paul Bonnet Published online: 14 July 2013 Springer-Verlag Berlin Heidelberg 2013 Flow control is a key issue for the future of aerodynamics Flow control is also a field that requires experiments at and fluid-related subjects. This is a rapidly evolving field various scales. This is a particularly important and under- with innovative technical developments involving many appreciated aspect, given the scaling requirements imposed different research disciplines. These innovations have tre- by small-scale laboratory experiments that require higher mendous potential for commercial applications. Compared frequencies and smaller sizes for actuators and sensors. to most fluid mechanics applications, flow control is Sensing has to be made in view of controlling the flow via intrinsically a multidisciplinary subject involving not only feedback, which is not identical to determining flowfield fluid mechanics but also control, dynamical systems theory characteristics of turbulent flows, such as turbulent kinetic and electromechanical transducers for actuators and sen- energy via conventional velocimetry methods. In this top- sors. For example, appropriate actuators must be selected, ical collection, several studies are devoted to the actuator designed and implemented, typically first in open-loop, to designs or developments, including zero-net, mass-flux or explore the response of a flow to perturbations. Then, ‘‘synthetic jets,’’ conventional and MEMS pulsed jets, theory is usually required to derive reduced-order models fluidic oscillators, dielectric barrier discharge and arc-fila- (ROMs) to simplify the representation of typically turbu- ment plasma actuators, electroactive polymers, and active lent flows and to derive feedback control strategies in surfaces. A few papers address novel sensing, estimation concert with appropriate sensors. and detection schemes with an eye toward closed-loop This topical collection, consisting of 23 contributed control. papers by noted experts in the field, provides a represen- Indeed, the ultimate goal of many applications is closed- tative cross-section of all of these topics. For example, loop control due to its potential for reduced actuator power several theoretical methods, such as POD and its variants, requirements and robustness, etc. The collection therefore NARX, and ROM-based models, are described in detail. contains several examples of feedback control methods The issue also includes some novel examples of passive applied to a variety of flows, ranging from jets to separated control, for example, flexible filaments for jet noise and flows. Finally, we note that this topical issue presents all of flexible membranes for low Reynolds-number aerodynamic these methods in the context of a particular application, applications. such as noise reduction, separation control, drag reduction, aero-optics, transition, and stall control in laminar to tur- bulent and steady and unsteady flows. We therefore hope this collection of papers will provide both a snapshot of the L. Cattafesta (&) current state-of-the-art in this multidisciplinary field and Florida Center for Advanced Aero-Propulsion (FCAAP), future trends and challenges. FAMU/FSU College of Engineering, Tallahassee, FL, USA e-mail: J.-P. Bonnet Institut Pprime, UPR 3346, CNRS/University of Poitiers/ISAE-ENSMA, Poitiers, France e-mail: Experiments in Fluids Springer Journals
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Springer Berlin Heidelberg
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
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