Pressure velocity coupling in a subsonic round jet

Picard, Céline; Delville, J.

doi:10.1016/s0142-727x(00)00021-7

Cited by 175 publications

(92 citation statements)

References 9 publications

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“…The essential idea of the EPOD approach is explained in two steps, using the representations (2.2) and (2.4) of the previous subsection (see Picard & Delville 2000;Maurel et al 2001;Borée 2003).…”

Section: Extended Proper Orthogonal Decomposition (Epod)mentioning

confidence: 99%

“…In EPOD, structures of the hydrodynamic field are identified that are most correlated with a given observable, e.g. with pressure signals beyond the considered domain (Picard & Delville 2000;Maurel, Borée & Lumley 2001;Borée 2003;Hoarau et al 2006). Flow estimation is therefore facilitated by EPOD to reconstruct the hydrodynamic attractor from a measured observable.…”

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confidence: 99%

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On least-order flow representations for aerodynamics and aeroacoustics

et al. 2012

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We propose a generalization of proper orthogonal decomposition (POD) for optimal flow resolution of linearly related observables. This Galerkin expansion, termed 'observable inferred decomposition' (OID), addresses a need in aerodynamic and aeroacoustic applications by identifying the modes contributing most to these observables. Thus, OID constitutes a building block for physical understanding, leastbiased conditional sampling, state estimation and control design. From a continuum of OID versions, two variants are tailored for purposes of observer and control design, respectively. Firstly, the most probable flow state consistent with the observable is constructed by a 'least-residual' variant. This version constitutes a simple, easily generalizable reconstruction of the most probable hydrodynamic state to preprocess efficient observer design. Secondly, the 'least-energetic' variant identifies modes with the largest gain for the observable. This version is a building block for Lyapunov control design. The efficient dimension reduction of OID as compared to POD is demonstrated for several shear flows. In particular, three aerodynamic and aeroacoustic goal functionals are studied: (i) lift and drag fluctuation of a two-dimensional cylinder wake flow; (ii) aeroacoustic density fluctuations measured by a sensor array and emitted from a two-dimensional compressible mixing layer; † Email address for correspondence: michael.schlegel@tu-berlin.de

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Section: Extended Proper Orthogonal Decomposition (Epod)mentioning

confidence: 99%

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confidence: 99%

On least-order flow representations for aerodynamics and aeroacoustics

et al. 2012

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“…[13][14][15] A notion of convective velocity, U c , of the LSS can be obtained from a space-time crosscorrelation of the NFP signals measured at two axial stations. 13,14 The convective velocity is known to scale with the centerline velocity, and thus U c decreases downstream of the potential core. The correlation method is used to calculate U c /U j , and a value of 0.71 is obtained at x = 4D for all four exit velocities tested.…”

Section: A Experimental Observationsmentioning

confidence: 99%

“…By positioning the probes just outside the shear layer, we obtain a non-intrusive measurement of the hydrodynamic pressure field that is linearly driven by large-scale structures. [12][13][14][15][16][17] This avoids the strong nonlinear vorticity and entropy disturbances inside the shear layer, as well as the acoustic waves that dominate further outward. 12,15 Plasma actuation manipulates the LSS, so that the forcing effect can be conveniently assessed by analyzing the NFP.…”

Section: Introductionmentioning

confidence: 99%

The Impulse Response of a High-Speed Jet Forced with Localized Arc Filament Plasma Actuators

Sinha

Alkandry²,

Kearney-Fischer

et al. 2012

18th AIAA/CEAS Aeroacoustics Conference (33rd AIAA Aeroacoustics Conference)

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Experimental study of planar opposed jets with acoustic excitation Phys. Fluids 25, 014108 (2013) Similarity analysis of the momentum field of a subsonic, plane air jet with varying jet-exit and local Reynolds numbers Phys. Fluids 25, 015115 (2013) Electrohydrodynamic printing under applied pole-type nozzle configuration Appl. Phys. Lett. 102, 024101 (2013) Effects of fluid properties and laser fluence on jet formation during laser direct writing of glycerol solution J. Appl. Phys. 112, 083105 (2012) We present experimental and theoretical analyses of the response of high-speed, highReynolds-number, round jets to impulsive forcing with arc-filament-plasma actuators. The impulse response is obtained with forcing Strouhal numbers, based on the nozzle exit diameter and exit center line velocity, less than 0.1. The resulting phase-averaged near-field pressure signature displays a compact wave with a positive peak preceding a negative one, indicative of a large scale structure in the shear layer of the jet. Scaling laws derived by operating the jet at four subsonic Mach numbers are used to distinguish this hydrodynamic component of the phase-averaged jet response from the direct actuator noise. As the forcing frequency increases, the compact waves in the near-field pressure signal overlap each other, indicating interaction of the growing seeded structures. For this regime, the phase-averaged response is approximately replicated by linear superposition of the impulse response, thereby demonstrating the quasi-linearity of structure interaction. A novel application of linear parabolized stability theory yields a successful model of the impulse response. C 2012 American Institute of Physics.[http://dx

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“…As shown by Taylor (2001), Naguib, et al (2001), and Picard & Delville (1999), a condition average of the velocity, Uy X {i), can be formulated using the time dependent wall pressure event, P(t), as the condition to yield an estimated velocity, u ijx (t) :…”

Section: Stochastic Estimationmentioning

confidence: 99%

Shear Layer Dynamics in Resonating Cavity Flows

Ukeiley¹,

Murray²

2004

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Pressure velocity coupling in a subsonic round jet

Cited by 175 publications

References 9 publications

On least-order flow representations for aerodynamics and aeroacoustics

On least-order flow representations for aerodynamics and aeroacoustics

The Impulse Response of a High-Speed Jet Forced with Localized Arc Filament Plasma Actuators

Shear Layer Dynamics in Resonating Cavity Flows

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