Upstream open loop control of the recirculation area downstream of a backward-facing step

Nicolas Gautier; Jean-Luc Aider

doi:10.1016/j.crme.2014.05.004

Separation flow control

Upstream open loop control of the recirculation area downstream of a backward-facing step

Nicolas Gautier ¹; Jean-Luc Aider ¹

¹ Laboratoire de physique et mécanique des milieux hétérogènes (PMMH), UMR7636 CNRS, École supérieure de physique et chimie industrielles de la Ville de Paris, 10, rue Vauquelin, 75005 Paris, France

Comptes Rendus. Mécanique, Flow separation control, Volume 342 (2014) no. 6-7, pp. 382-388.

Abstract

The flow downstream a backward-facing step is controlled using a pulsed jet placed upstream of the step edge. Experimental velocity fields are computed and used to quantify the recirculation area. The effects of jet amplitude, frequency and duty cycle on this recirculation area are investigated for two Reynolds numbers ( ${Re}_{h} = 2070$ and ${Re}_{h} = 2900$ ). The results of this experimental study demonstrate that upstream actuation can be as efficient as actuation at the step edge when exciting the shear layer at its natural frequency. Moreover, it is shown that it is possible to minimize both jet amplitude and duty cycle and still achieve optimal efficiency. With minimal amplitude and a duty-cycle as low as 10%, the recirculation area is nearly canceled.

Received: 2013-08-30
Accepted: 2013-11-29
Published online: 2014-06-01

DOI: 10.1016/j.crme.2014.05.004

Mots-clés : Flow control, Open loop control, Pulsed jets, Upstream actuation, Backward-facing step, Duty-cycle

Author's affiliations:

Nicolas Gautier ¹; Jean-Luc Aider ¹

¹ Laboratoire de physique et mécanique des milieux hétérogènes (PMMH), UMR7636 CNRS, École supérieure de physique et chimie industrielles de la Ville de Paris, 10, rue Vauquelin, 75005 Paris, France

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     title = {Upstream open loop control of the recirculation area downstream of a backward-facing step},
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     pages = {382--388},
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     language = {en},
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Nicolas Gautier; Jean-Luc Aider. Upstream open loop control of the recirculation area downstream of a backward-facing step. Comptes Rendus. Mécanique, Flow separation control, Volume 342 (2014) no. 6-7, pp. 382-388. doi : 10.1016/j.crme.2014.05.004. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2014.05.004/

References
Cited by

[1] R.L. Simpson Aspect of turbulent boundary layer separation, Prog. Aerosp. Sci., Volume 32 (1996), pp. 457-521

[2] W.D. Hucho Aerodynamic of Road Vehicles, Vieweg, Braunschweig, Germany, 2005

[3] C.O. Paschereit; E. Gutmark; W. Weisenstein Excitation of thermoacoustic instabilities by the interaction of acoustics and unstable swirling flow, AIAA J., Volume 38 (2000), pp. 1025-1034

[4] B.F. Armaly; F. Durst; J.C.F. Pereira; B. Schonung Experimental and theoretical investigation of backward-facing step flow, J. Fluid Mech., Volume 127 (1983), pp. 473-496

[5] L. Hung; M. Parviz; K. John Direct numerical simulation of turbulent flow over a backward-facing step, J. Fluid Mech., Volume 330 (1997), pp. 349-374

[6] J.-F. Beaudoin; O. Cadot; J.-L. Aider; J.E. Wesfreid Three-dimensional stationary flow over a backwards-facing step, Eur. J. Mech., Volume 38 (2004), pp. 147-155

[7] J.-L. Aider; A. Danet; M. Lesieur Large-eddy simulation applied to study the influence of upstream conditions on the time-dependant and averaged characteristics of a backward-facing step flow, J. Turbul., Volume 8 (2007)

[8] A. Darabi; I. Wygnanski Active management of naturally separated flow over a solid surface. Part 1. The forced reattachment process, J. Fluid Mech., Volume 510 (2004), pp. 105-129

[9] H. Fiedler; H.H. Fernholz On the management and control of turbulent shear flows, Prog. Aerosp. Sci., Volume 72 (1990), pp. 305-387

[10] K.B. Chun; H.J. Sung Control of turbulent separated flow over a backward-facing step by local forcing, Exp. Fluids, Volume 21 (1996), pp. 417-426

[11] V. Uruba; P. Jonas; O. Mazur Control of a channel-flow behind a backward-facing step by suction/blowing, Heat Fluid Flow, Volume 28 (2007), pp. 665-672

[12] S. Narayan, B.R. Noack, A. Banaszuk, A.I. Khibnik, Active separation control concept: dynamic forcing of induced separation using harmonically related frequency, March 2002.

[13] R.T. M'Closkey; J.M. King; L. Cortelezzi; A.R. Karagozian The actively controlled jet in crossflow, J. Fluid Mech., Volume 452 (2002), pp. 325-335

[14] A. Eroglu; R.E. Breidenthal Structure, penetration, and mixing of pulsed jets in crossflow, AIAA J., Volume 39 (2001), pp. 417-423

[15] M. Pastoor; L. Henning; B.R. Noack; R. King; G. Tadmor Feedback shear layer control for bluff body drag reduction, J. Fluid Mech., Volume 608 (2008), pp. 161-196

[16] L. Henning; R. King Robust multivariable closed-loop control of a turbulent backward-facing step flow, J. Aircr., Volume 44 (2007) no. 1, pp. 201-208

[17] D. Sipp; A. Barbagallo; P. Schmid Closed-loop control of an unstable open cavity, J. Fluid Mech., Volume 641 (2010), pp. 1-50

[18] N. Gautier; J.-L. Aider Control of the flow behind a backwards facing step with visual feedback, Proc. R. Soc. Lond. (2013) (submitted for publication, available at arXiv)

[19] B.D. Lucas Generalized image matching by the method of differences, Carnegie Mellon University, Pittsburgh, PA, USA, 1984 (PhD)

[20] F. Champagnat; A. Plyer; G. Le Besnerais; B. Leclaire; S. Davoust; Y. Le Sant Fast and accurate PIV computation using highly parallel iterative correlation maximization, Exp. Fluids, Volume 50 (2011), pp. 1169-1182

[21] S. Davoust; L. Jacquin; B. Leclaire Dynamics of $m = 0$ and $m = 1$ modes and of streamwise vortices in a turbulent axisymmetric mixing layer, J. Fluid Mech., Volume 709 (2012), pp. 408-444

[22] F. Sartor; G. Losfeld; R. Bur PIV study on a shock-induced transition in subsonic flow, Exp. Fluids, Volume 53 (2012), pp. 815-827

[23] M.S. Chong; A.E. Perry; B.J. Cantwell A general classification of 3-dimensional flow fields, Phys. Fluids, Volume 2 (1990), pp. 765-777

[24] J. Zhou; R.J. Adrian; S. Balachandar; T.M. Kendall Mechanisms for generating coherent packets of hairpin vortices, J. Fluid Mech., Volume 387 (1999), pp. 353-396

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