Acoustic receptivity of laminar boundary layers over wavy walls

Wiegel, M.; Wlezien, R. W.

doi:10.2514/6.1993-3280

Cited by 46 publications

(29 citation statements)

References 17 publications

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“…This is not a problem for localized receptivity sites because one need only measure the freestream amplitude at the local position. For distributed receptivity sites, Wiegel & Wlezien (1993) used a second acoustic wave from the diffuser, cancelled the standing wave pattern, and created a streamwise-uniform sound amplitude distribution. This technique is now considered the standard means for obtaining uniform sound fields.…”

Section: Resolution Of Duct Acousticsmentioning

confidence: 99%

“…This work has recently been taken up by Cullen & Horton (2000), who experimentally verified the qualitative aspects of the theory. Wiegel & Wlezien (1993) considered distributed two-dimensional roughness as receptivity in a effort to provide a data base for the theoretical work of Choudhari (1993) and Crouch (1992b). When multiple receptivity elements are used, it is important to have a uniform sound field across the elements so that the same normalizing |u ac | fs can be used in the receptivity coefficient.…”

Section: Receptivity Of Roughness To Freestream Soundmentioning

confidence: 99%

“…In a series of careful experiments, King & Breuer (2001) extended the work of Wiegel & Wlezien (1993) by considering oblique (or swept) distributed roughness strips. They expanded the data set for two-dimensional roughness and successfully compared with the results of Crouch (1992b).…”

Section: Receptivity Of Roughness To Freestream Soundmentioning

confidence: 99%

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BOUNDARY-LAYER RECEPTIVITY TO FREESTREAM DISTURBANCES

Saric

Reed

Kerschen

2002

Annu. Rev. Fluid Mech.

460

174

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The current understanding of boundary-layer receptivity to external acoustic and vortical disturbances is reviewed. Recent advances in theoretical modeling, numerical simulations, and experiments are discussed. It is shown that aspects of the theory have been validated and that the mechanisms by which freestream disturbances provide the initial conditions for unstable waves are better understood. Challenges remain, however, particularly with respect to freestream turbulence.

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Section: Resolution Of Duct Acousticsmentioning

confidence: 99%

Section: Receptivity Of Roughness To Freestream Soundmentioning

confidence: 99%

See 1 more Smart Citation

BOUNDARY-LAYER RECEPTIVITY TO FREESTREAM DISTURBANCES

Saric

Reed

Kerschen

2002

Annu. Rev. Fluid Mech.

460

174

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“…FRNT-based wavy-wall predictions were undertaken by Wiegel & Wlezien 26 . Wall waviness was reproduced through a series of 40µm-thick polyester tape spaced 25.4mm apart (50.8mm center to center) up to a total of 13 strips.…”

mentioning

confidence: 99%

Acoustic receptivity and transition modeling of Tollmien-Schlichting disturbances induced by distributed surface roughness

2018

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Acoustic receptivity to Tollmien-Schlichting waves in the presence of surface roughness is investigated for a flat plate boundary layer using the time-harmonic incompressible linearized Navier-Stokes equations. It is shown to be an accurate and efficient means of predicting receptivity amplitudes, and therefore to be more suitable for parametric investigations than other approaches with DNS-like accuracy. Comparison with literature provides strong evidence of the correctness of the approach, including the ability to quantify non-parallel flow effects. These effects are found to be small for the efficiency function over a wide range of frequencies and local Reynolds numbers. In the presence of a two-dimensional wavy-wall, non-parallel flow effects are quite significant, producing both wavenumber detuning and an increase in maximum amplitude. However, a smaller influence is observed when considering an oblique Tollmien-Schlichting wave. This is explained by considering the non-parallel effects on receptivity and on linear growth which may, under certain conditions, cancel each other out. Ultimately, we undertake a Monte-Carlo type uncertainty quantification analysis with two-dimensional distributed random roughness. Its power spectral density (PSD) is assumed to follow a power law with an associated uncertainty following a probabilistic Gaussian distribution. The effects of the acoustic frequency over the mean amplitude of the generated two-dimensional Tollmien-Schlichting waves are studied. A strong dependence on the mean PSD shape is observed and discussed according to the basic resonance mechanisms leading to receptivity. The growth of Tollmien-Schlichting waves is predicted with non-linear parabolized stability equations computations to assess the effects of stochasticity in transition location.

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“…Shown in Fig. 11 is the disturbance amplitude max y {U w,ac (x,y)} (without roughness height and acoustic amplitude parameters ε w and ε ac ), corresponding to the experiment of Wiegel and Wlezien [9] in which a series of tape strips were placed at spacings corresponding to the wavelength of the TS wave excited at the acoustic-driver frequency in a flatplate boundary layer. The receptivity saturation observed in that experiment, and predicted by an extension of the local receptivity theory [10], is apparent.…”

Section: Nonlinear Receptivitymentioning

confidence: 99%

Direct harmonic linear Navier-Stokes methods for efficient simulation of wave packets

Streett

1998

36th AIAA Aerospace Sciences Meeting and Exhibit

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Wave packets produced by localized disturbances play an important role in transition in three-dimensional boundary layers, such as that on a swept wing. Starting with the receptivity process, we show the effects of wave-space energy distribution on the development of packets and other three-dimensional disturbance patterns. Nonlinearity in the receptivity process is specifically addressed, including demonstration of an effect which can enhance receptivity of traveling crossflow disturbances. An efficient spatial numerical simulation method is demonstrated for the computation of these flows, allowing most of the simulations presented to be carried out on a workstation.

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Acoustic receptivity of laminar boundary layers over wavy walls

Cited by 46 publications

References 17 publications

BOUNDARY-LAYER RECEPTIVITY TO FREESTREAM DISTURBANCES

BOUNDARY-LAYER RECEPTIVITY TO FREESTREAM DISTURBANCES

Acoustic receptivity and transition modeling of Tollmien-Schlichting disturbances induced by distributed surface roughness

Direct harmonic linear Navier-Stokes methods for efficient simulation of wave packets

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