An experimental investigation of wall pressure fluctuations beneath non-equilibrium turbulent flows

Farabee, Theodore M.

doi:10.1121/1.395879

Cited by 8 publications

(26 citation statements)

References 17 publications

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“…2a is the wall pressure spectrum for a planar boundary layer at a similar Reynolds number. 35 There is no significant difference between the flat plate measurements and the cylindrical boundary layer measurements at high frequencies when plotted in the usual inner variables. At low frequencies the differences in the spectra are consistent with previous researchers.…”

Section: Spectral and Correlation Resultsmentioning

confidence: 99%

Spanwise structure of wall pressure on a cylinder in axial flow

1999

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The spanwise structure of wall pressure fluctuations was measured in an axisymmetric turbulent boundary layer on a cylinder parallel to the mean flow at a momentum thickness Reynolds number of 2530 and a boundary layer thickness to cylinder radius ratio of 4.81. The measurements were made using miniature hearing aid type condenser microphones with spanwise separations of 0°, 10°, 20°, 30°, 60°, and 90°. An improved wall pressure power spectrum was obtained at low frequencies by utilizing a two-point subtraction method to remove low frequency acoustic background noise of the wind tunnel. The spanwise correlations indicate that the spanwise coherent length of the wall pressure is 30°(78/u or 0.11␦͒. The spanwise coherence is weak and concentrated in a frequency band that is substantially lower than the most energetic frequency band of the wall pressure spectrum. A mode number-frequency decomposition of the wall pressure spectrum indicates that the greatest quantity of energy is in the circumferential modes nearest zero. Modes Ϫ4 to 4 contain most of the wall pressure energy. Conditional sampling by pressure peak and VITA detection schemes ͑where VITA was applied to wall pressure to detect strong pressure gradient events͒ indicate that the spanwise extent of the high pressure peaks and high wall pressure gradients is 60°( 156/u or 0.22␦͒.

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Section: Spectral and Correlation Resultsmentioning

confidence: 99%

Spanwise structure of wall pressure on a cylinder in axial flow

1999

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“…2). Bakewell et al [19] Bull [20] Bull & Thomas [21] Carey et al [22] Choi & Moin [6] Farabee [23] Keith & Bennett [24] Schewe [25] Schloemer [26] Willmarth & Wooldridge [27] Chase [28] …”

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confidence: 99%

Wall-Pressure Spectral Model Including the Adverse Pressure Gradient Effects

2012

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An empirical model to predict the wall-pressure fluctuations spectra beneath adverse pressure gradient flows is presented. It is based on Goody's model which already incorporates the effect of Reynolds number but is limited to zero-pressure gradient flows. The extension relies on 6 test-cases from 5 experimental or numerical studies covering a large range of Reynolds number, 5.6 × 10 2 < R θ < 1.72 × 10 4 , in both inter-

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“…Non-equilibrium boundary layer #ows have not been studied nearly as extensively as equilibrium boundary layers. As Farabee [13] pointed out, this is due not only to the complexities associated with non-equilibrium #ows, but also to the many ways this type of #ow can be developed.…”

Section: Introductionmentioning

confidence: 96%