Characteristics of Wall Pressure Fluctuations for a Flat Plate Turbulent Boundary Layer with Pressure Gradients

Hu, Naifei; Herr, Michaela

doi:10.2514/6.2016-2749

Cited by 43 publications

(65 citation statements)

References 29 publications

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“…In particular, figure 23(a-d) shows very good compliance with the low Reynolds number direct numerical simulation (DNS) of Spalart & Watmuff (1993). Recent measurement data of Hu & Herr (2016) and the simulation results are also in good agreement, as illustrated in figure 26(a-c).…”

Section: Velocity Profiles and Similarity Scalessupporting

confidence: 62%

“…The shape factor, plotted in figure 5(c), is also relatively constant over the interest zone, with increasing values from favourable to adverse gradients. Some authors (Hu & Herr 2016) propose to use these values for characterizing the gradient intensity.…”

Section: Pressure-gradient Parametersmentioning

confidence: 99%

“…As in Salze et al (2014), a formula based on the work of Smol'yakov (2006) for the frequency-dependent phase velocity was calibrated. Another experimental study of the effects of pressure gradients on turbulent wall-pressure fluctuations was recently published by Hu & Herr (2016). A rotatable airfoil located near the end of a flat plate placed in the open jet of an anechoic facility at DLR Braunschweig was used to obtain both favourable and adverse pressure gradients.…”

Section: Introductionmentioning

confidence: 99%

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Influence of pressure gradients on wall pressure beneath a turbulent boundary layer

Cohen

Gloerfelt

2018

J. Fluid Mech.

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This study investigates the effects of a pressure gradient on the wall pressure beneath equilibrium turbulent boundary layers. Excitation of the walls of a vehicle by turbulent boundary layers indeed constitutes a major source of interior noise and it is necessary to take into account the presence of a pressure gradient to represent the effect of the curvature of the walls. With this aim, large-eddy simulations of turbulent boundary layers in the presence of both mild adverse and mild favourable pressure gradients are carried out by solving the compressible Navier–Stokes equations. This method provides both the aeroacoustic contribution and the hydrodynamic wall-pressure fluctuations. A critical comparison with existing databases, including recent measurements, is conducted to assess the influence of a free stream pressure gradient. The analyses of wall-pressure spectral densities show an increase in the low-frequency content from adverse to favourable conditions, yielding higher integrated levels of pressure fluctuations scaled by the wall shear stress. This is accompanied by a steeper decay rate in the medium-frequency portion for adverse pressure gradients. No significant difference is found for the mean convection velocity. Frequency–wavenumber spectra including the subconvective region are presented for the first time in the presence of a pressure gradient. A scaling law for the convective ridge is proposed, and the acoustic domain is captured by the simulations. Direct acoustic emissions have similar features in all gradient cases, even if slightly higher levels are noted for boundary layers subjected to an adverse gradient.

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Section: Velocity Profiles and Similarity Scalessupporting

confidence: 62%

Section: Pressure-gradient Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of pressure gradients on wall pressure beneath a turbulent boundary layer

Cohen

Gloerfelt

2018

J. Fluid Mech.

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“…The mean velocity profiles were measured at x 1 = 1210 mm for ZPG and APG boundary layers and an additional point at x 1 = 1128 mm for the APG boundary layer from Hu and Herr. 17 The calculated mean flow velocity profiles from RANS are compared to the measured profiles, shown in Fig. 2.…”

Section: Computational Setups and Mean Flow Conditionsmentioning

confidence: 99%

“…15 The results of one-point spectra, cross spectra and convective velocities for the wall pressure fluctuations are analyzed and compared to the experimental results from Hu and Herr. 17 Firstly, the method is briefly described in section II. Secondly, the numerical setups and the flow conditions for the calculated cases are presented in section III.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Wall Pressure Fluctuations for Zero and Non-Zero Pressure Gradient Turbulent Boundary Layers

Appel

Herr

et al. 2016

22nd AIAA/CEAS Aeroacoustics Conference

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Turbulent boundary layers on a flat plate configuration are simulated using synthetic turbulence generated by the Fast Random Particle-Mesh Method. The averaged turbulence statistics needed for the stochastic realization is provided by a Reynolds averaged Navier-Stokes calculation. Wall pressure fluctuations are obtained by calculating a Poisson equation including both the mean-shear turbulence interaction source term and the turbulence-turbulence interaction source term. The Poisson equation is solved by means of Hockney's method. Wall pressure fluctuations for zero and adverse pressure gradient boundary layers are calculated. The adverse pressure gradient is realized by placing an airfoil above the flat plate. Simulated one-point spectra and two-point statistics are analyzed. The results are compared to the experimental results, which were measured in the Acoustic Windtunnel Braunschweig for the same configurations. Good agreement with the experimental results is obtained.

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Investigation on favorable pressure gradient in an atmospheric boundary layer wind tunnel using large‐eddy simulation and its impact on wind field and surface pressure measurement

Zhang

Ooka

Kikumoto

et al. 2023

Japan Architectural Review

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A constant cross‐section wind tunnel usually experiences a negative pressure gradient (ie, favorable pressure gradient, FPG), resulting in a certain degree of discrepancy between the simulated and idealized atmospheric boundary layer (ABL) flows. To investigate its impact, three large‐eddy simulation (LES) cases were conducted in this study: one simply reproduced a wind tunnel, one removed the FPG by adjusting the ceiling height, and one reduced the FPG by canceling unnecessary boundary layers associated with the tunnel sidewalls and ceiling. The required ceiling height in the second case was estimated based on the pressure gradient in the first case. The FPG was found mainly generated by the contraction effect induced by the boundary layers over the tunnel walls because it can be largely removed in the third case. In addition, we investigated the mean and standard deviation of the surrounding wind field and surface pressure coefficient of an isolated square‐section building model. Because the FPG in the macroscale ABL is negligible compared with the adverse pressure gradient in the microscale near‐wall boundary layers of the building, the influence of the FPG is negligible in a wind tunnel experiment conducted in a relatively large wind tunnel with a safe blockage ratio.

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Characteristics of Wall Pressure Fluctuations for a Flat Plate Turbulent Boundary Layer with Pressure Gradients

Cited by 43 publications

References 29 publications

Influence of pressure gradients on wall pressure beneath a turbulent boundary layer

Influence of pressure gradients on wall pressure beneath a turbulent boundary layer

Numerical Study of Wall Pressure Fluctuations for Zero and Non-Zero Pressure Gradient Turbulent Boundary Layers

Investigation on favorable pressure gradient in an atmospheric boundary layer wind tunnel using large‐eddy simulation and its impact on wind field and surface pressure measurement

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