A Hybrid Computational Aeroacoustic Method For Low Speed Flows

Tosh, Abhijit; Caraeni, Mirela; Caraeni, Doru

doi:10.2514/6.2018-4096

Cited by 4 publications

(6 citation statements)

References 19 publications

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“…35 However, information on the far-field noise propagation was not presented in the study of Yu et al 22 Whereas with Tosh et al 29 , despite a good overall agreement with the experiment on the far-field noise predicted by a direct calculation, deviation of ~ 6-9 dB was observed in the mid-frequency ranges between (300 -700 Hz) among the microphone placed around the mirror, and the distant microphone was ignored. However, considering the large number of cells used in the cases mentioned above, the feasibility of extending it to realistic cases with a mirror integrated on a vehicle with the requirements proposed by Tosh et al 29 may be challenging.…”

Section: A the Generic Side View Mirrormentioning

confidence: 93%

“…For the far-field noise predictions, methods such as Ffowcs Williams-Hawkings (FW-H), Acoustic Perturbation Equations (APE), Lighthill's analogies and Direct Noise Computation (DNC) are commonly used for predicting and mitigating the induced noise from side-view mirrors. [29][30][31][32][33] Lokhande et al 34 used the LES approach with the FW-H analogy and DNC method for evaluating acoustic and compared the numerical prediction against the experimental by Siegert et al 13 The hydrodynamic pressure fluctuations were resolved accurately up to 700 Hz with a maximum deviation of 5-10 dB, and also SPL reported was in reasonable agreement with experiments at high frequencies against the experimental results of Siegert et al 13 Rung et al 14 observed a similar deviation in the SPL level predicted by DES with the FW-H analogy. The authors point out that the deviations in the studies mentioned above were attributed to the low-resolution of the grid in the wake and larger time steps used.…”

Section: A the Generic Side View Mirrormentioning

confidence: 99%

“…The authors point out that the deviations in the studies mentioned above were attributed to the low-resolution of the grid in the wake and larger time steps used. 11,12 Tosh et al 29 employed the SST-DES and APE on a well resolved hierarchical cartesian grid consisting of 69.6 x 10 6 cells. The unsteady pressure signatures on the mounting plate and HRM were well resolved and provided an excellent agreement with the experimental results presented by Ask and Davidson 16 for frequencies of up to 1200 Hz.The level of agreement on the HPFs with experimental data obtained by Tosh et al 29 using the SST-DES is similar to a very recent study by Yu et al 22 using the SST-DDES with different pressure velocity coupling based on the traditional SIMPLEC algorithm and four-step algorithm proposed by Choi and Moin.…”

Section: A the Generic Side View Mirrormentioning

confidence: 99%

“…11,12 Tosh et al 29 employed the SST-DES and APE on a well resolved hierarchical cartesian grid consisting of 69.6 x 10 6 cells. The unsteady pressure signatures on the mounting plate and HRM were well resolved and provided an excellent agreement with the experimental results presented by Ask and Davidson 16 for frequencies of up to 1200 Hz.The level of agreement on the HPFs with experimental data obtained by Tosh et al 29 using the SST-DES is similar to a very recent study by Yu et al 22 using the SST-DDES with different pressure velocity coupling based on the traditional SIMPLEC algorithm and four-step algorithm proposed by Choi and Moin. 35 However, information on the far-field noise propagation was not presented in the study of Yu et al 22 Whereas with Tosh et al 29 , despite a good overall agreement with the experiment on the far-field noise predicted by a direct calculation, deviation of ~ 6-9 dB was observed in the mid-frequency ranges between (300 -700 Hz) among the microphone placed around the mirror, and the distant microphone was ignored.…”

Section: A the Generic Side View Mirrormentioning

confidence: 99%

“…Due to the APE being solved for an entire computational domain in space, any abrupt changes or non-uniformities in the mesh can lead to an erroneous APE solution. 29,56 Therefore, in this study, the APE was only solved with the structured grid. The results obtained from KI and FW-H for the structured grid were compared against the FW-H obtained from the poly-hex core grid at M10, as shown in Fig.…”

Section: Please Cite This Article As Doi: 101063/50057166mentioning

confidence: 99%

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Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

2021

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Noise radiated from flow past different configurations of the Half-Round Mirror (HRM) mounted on a plate has been investigated using computational aeroacoustics (CAA).The Stress-Blended Eddy Simulation (SBES), together with the Ffowcs Williams-Hawkings (FW-H) acoustic analogy, was employed to predict near field flow and far-field noise, respectively. The numerical methodology was verified and validated for the standard HRM case against several previously published numerical and experimental data sets, which provides good agreement. Further, (i) the choice of different type of grids for CAA and (ii) the applicability of methods such as the Kirchhoff integral and the FW-H using near field inputs computed from the SBES were assessed. As a next step, the effect of induced noise from the HRM for different a) Aspect Ratios (AR) ranging from 1 to 2.5 and b) inclination of the mirror towards the plate (θ) ranging from 0° to 32° were investigated. For all the investigated cases, the distribution of the radiated noise exhibits a dipole-like structure closer to the plate and a monopole-like structure away from the plate. By inclining the mirror closer to the mounting plate, the emitted noise is reduced both in the vertical and lateral directions of the wake, whereas an increase in the AR of the mirror increases the induced noise considerably. The findings from the current study can provide a deeper understanding for effectively mitigating the induced aerodynamic noise from side-view mirrors.

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Section: A the Generic Side View Mirrormentioning

confidence: 93%

Section: A the Generic Side View Mirrormentioning

confidence: 99%

Section: A the Generic Side View Mirrormentioning

confidence: 99%

Section: A the Generic Side View Mirrormentioning

confidence: 99%

Section: Please Cite This Article As Doi: 101063/50057166mentioning

confidence: 99%

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Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

2021

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A second-generation URANS model (STRUCT-$$\epsilon $$) applied to a generic side mirror and its impact on sound generation

Munoz-Paniagua,

García,

Latorre-Iglesias

2024

Engineering with Computers

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A generic side mirror can be approximated to the combination of a half cylinder topped with a quarter of sphere. The flow structure in the wake of the side mirror is highly transient and the turbulence plays an important role affecting aeroacoustics through pressure fluctuation. Thus, this geometry is one of the test cases object of several numerical studies in recent years to assess the aerodynamic and aeroacoustic capabilities of the turbulence models. In this context, this study presents how the second-generation URANS closure STRUCT-$$\epsilon $$ ϵ is able to properly predict the expected stagnation, flow separation and vortex shedding phenomena. Besides, the predictive accuracy for the noise generation mechanism is evaluated by comparing the spectra of the sound pressure level measured at several static pressure sensors with the numerical results obtained with the STRUCT-$$\epsilon $$ ϵ . The response of this turbulence model has exceeded that from other hybrid methods and is in good agreement with the results from Large-Eddy Simulations or the experiments. To conclude the paper, the applicability of STRUCT-$$\epsilon $$ ϵ to construct a Spectral Proper Orthogonal Decomposition method that helps identifying the most energetic modes to appropriately capture the dominant flow structures is also introduced.

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Optimization study on the influence of rearview mirror and side window glass on interior noise

Shi

Mao

et al. 2023

Journal of Vibration and Control

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Based on the LES model, the compressible transient CFD simulation combined with the acoustic finite element method optimizes the effect of the rearview mirror and side window glass on in-vehicle noise from the perspective of sound source and transmission. The primary and secondary orders of the influence of different mirror shape and side window glass geometric parameters on the noise in the car were obtained through the design and analysis of orthogonal experiments, and the results of the flow and sound fields were compared. The following results are presented: acoustic source noise reduction from the rearview mirror is mainly affected by acoustic pressure excitation. The proportion of the mirror body of the rearview mirror, the angle of the lower edge, and the length of the mirror column affect the noise in the car in turn. The noise reduction control with PVB laminated glass as the transmission path is mainly limited by the low frequency turbulent pressure excitation. The inner and outer thicknesses of PVB laminated glass have different influences on the noise in the car under different frequency bands, and the results in the full frequency band are mainly affected by the low frequency band.

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A Hybrid Computational Aeroacoustic Method For Low Speed Flows

Cited by 4 publications

References 19 publications

Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

Noise emitted from a generic side-view mirror with different aspect ratios and inclinations

A second-generation URANS model (STRUCT-$$\epsilon $$) applied to a generic side mirror and its impact on sound generation

Optimization study on the influence of rearview mirror and side window glass on interior noise

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