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: firstname.lastname@example.org J.-P. Bonnet Institut Pprime, UPR 3346, CNRS/University of Poitiers/ISAE-ENSMA, Poitiers, France e-mail: email@example.com
Experiments in Fluids – Springer Journals
Published: Jul 14, 2013
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