A study on the application of two different acoustic analogies to experimental PIV data

Koschatzky, V.; Westerweel, J.; Boersma, Bendiks Jan

doi:10.1063/1.3596730

Cited by 25 publications

(8 citation statements)

References 38 publications

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“…Plugging equation (25) into equation ( 24), we have (26) where ε lA , by following the definition in equation ( 13), is…”

Section: Pressure Error At Inner Nodal Pointsmentioning

confidence: 99%

“…More recently, an improved Poisson equation approach is proposed by Auteri et al [23]. Following the advent of time-resolved PIV, the pressure reconstruction has also been adapted for measuring the temporal derivatives of surface pressure distribution, which is further used for estimating the acoustic pressure radiated from a surface [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

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Error propagation from the PIV-based pressure gradient to the integrated pressure by the omnidirectional integration method

Liu

Moreto

2020

Meas. Sci. Technol.

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This paper reports a theoretical analysis and the corresponding numerical and experimental validation results of the error propagation characteristics of the omnidirectional integration method used for pressure reconstruction from the PIV measured pressure gradient. The analysis shows that the omnidirectional integration provides an effective mechanism in reducing the sensitivity of the reconstructed pressure to the random noise embedded in the measured pressure gradient. Accurate determination of the boundary pressure values is the first step in ensuring the accuracy of the reconstructed pressure. The boundary pressure error consists of two parts, with one part decreasing exponentially in magnitude and eventually vanishing, and the other remaining as a constant with small magnitude through iteration. These results are verified by using a direct numerical simulation database of isotropic turbulence flow superimposed with noise at various noise levels and spatial distribution schemes to simulate noise embedded data. The nondimensionalized average error of the reconstructed pressure based on 1000 statistically independent pressure gradient field realizations with a 40% added noise level is 0.854 ± 0.406 for the pressure Poisson equation with Neumann boundary condition, 0.154 ± 0.015 for the circular virtual boundary omnidirectional integration and 0.149 ± 0.015 for the rotating parallel ray omnidirectional integration. If the converged boundary pressure values obtained by the rotating parallel ray are used as Dirichlet boundary conditions, the average pressure error by Poisson is reduced to 0.151 ± 0.015. Of the different variations of the omnidirectional methods, the parallel ray method shows the best performance and therefore is the method of choice. Comparisons of the performance of these pressure reconstruction methods using an experimentally obtained turbulent shear layer flow over an open cavity are in agreement with the conclusions obtained with the DNS simulation data. With the noise added DNS data, limitations regarding the pressure reconstruction methods in determining pressure fluctuation statistics are also identified and quantified.

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“…Plugging equation (25) into equation ( 24), we have (26) where ε lA , by following the definition in equation ( 13), is…”

Section: Pressure Error At Inner Nodal Pointsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Error propagation from the PIV-based pressure gradient to the integrated pressure by the omnidirectional integration method

Liu

Moreto

2020

Meas. Sci. Technol.

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“…In the present study, results from direct LSE reconstruction in the space-time domain allow the identification and quantification of the dynamics of the flow with details that cannot be achieved by current available optical diagnostics alone, but only with high-speed PIV as used by Koschatzky et al (2011a) and Koschatzky et al (2011b) in their study of a flow around a shallow single cavity with sharp edges (L/H ¼ 2). From the analyses of LSE results developed in Sec.…”

Section: Introductionmentioning

confidence: 97%

Characterization of acoustic sources in a corrugated pipe flow with linear stochastic estimation

Galeron

Amielh

Mattei

2021

The Journal of the Acoustical Society of America

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The intense whistling of corrugated pipe under flow is related to a coherence between the dynamics of structures developing in the shear layer over cavities and acoustic eigenmodes of the pipe. In order to highlight the coupling between aerodynamics and acoustics, three measurement systems with complementary characteristics in terms of space and time resolutions are synchronized. The simultaneity of the measurements of velocity and acoustic pressure provided by five local probes, as two hot-wires and three microphones, with the velocity fields measured by PIV in the same flow region is used to estimate the velocity fields at frequencies compatible with the space-time characterization of the acoustic sources. The linear stochastic estimation (LSE) is performed to reconstruct these high frequency velocity fields. Two rectangular corrugated pipes with different corrugation geometry are investigated. Thanks to the LSE velocity field reconstruction, the contribution of the flow structures, both jet flapping and vortex shedding, to acoustic level is highlighted. V

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“…Therefore, the highly three-dimensional (3D) turbulent flow over a cavity has been a prevailing research subject in recent years. Much attention has been paid to the resultant consequences, such as the spatial nature of the flow structure Barakos 2011, Cicca et al 2013), the pressure fluctuation induced by the flow field (Mori and Naganuma 2009, Mori and Naganuma 2010), the vibration-induced noise (Haigermoser 2009, Koschatzky et al 2011 and the heat transfer characteristics (Stiriba 2008, Stiriba et al 2013, but the turbulence distribution of high-speed flows in a cavity is still beyond our understanding. Experimental approaches are common methods for investigating such similar flows due to the simple geometry.…”

Section: Introductionmentioning

confidence: 99%

Parametrical study and turbulence analysis of high-speed flows around an open cavity using large eddy simulation

Shi¹,

Wang²,

Jin³

et al. 2019

Fluid Dyn. Res.

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Large eddy simulation is used in this work to simulate the three-dimensional turbulent flow in an open cavity, with special attention paid to the parametrical effect and turbulence analysis. The effect of mesh resolution, the sub-grid model and the advection scheme on the resolved flow structure is discussed in detail. Then, the mechanism of flow-induced pressure fluctuation associated with the primary and secondary vortex in the shear layer is clarified quantitatively and qualitatively. Finally, the turbulent kinetic energy and turbulence production rate, the contribution of three components to total turbulence production rate and the main single contributor are analyzed systematically. The present simulations are performed for two Reynolds numbers and the results show that the flow is more turbulent with the increase in Reynolds number, but the general flow morphology is almost the same. It is expected that the basic founding is useful for understanding such similar flows and will provide some guidelines for controlling the vortex-induced flow instability in engineering applications.

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A study on the application of two different acoustic analogies to experimental PIV data

Cited by 25 publications

References 38 publications

Error propagation from the PIV-based pressure gradient to the integrated pressure by the omnidirectional integration method

Error propagation from the PIV-based pressure gradient to the integrated pressure by the omnidirectional integration method

Characterization of acoustic sources in a corrugated pipe flow with linear stochastic estimation

Parametrical study and turbulence analysis of high-speed flows around an open cavity using large eddy simulation

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