Large Eddy Simulation of acoustic pulse propagation and turbulent flow interaction in expansion mufflers

Singh, Nishant K.; Rubini, Philip A.

doi:10.1016/j.apacoust.2015.04.015

Cited by 25 publications

(9 citation statements)

References 35 publications

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“…Although it can achieve a suppression effect in the low-frequency range, its effective silencing band is always too narrow [4,[18][19][20]. In contrast, the expansion-type silencer can achieve a broadband character of noise reduction, yet its silencing frequency is often too high [21,22].…”

Section: Introductionmentioning

confidence: 99%

Transmission of Low-Frequency Acoustic Waves in Seawater Piping Systems with Periodical and Adjustable Helmholtz Resonator

Liu

Yang

2017

JMSE

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Abstract:The characteristics of acoustic wave transmitting in a metamaterial-type seawater piping system are studied. The metamaterial pipe, which consists of a uniform pipe with air-water chamber Helmholtz resonators (HRs) mounted periodically along its axial direction, could generate a wide band gap in the low-frequency range, rendering the propagation of low-frequency acoustic waves in the piping system dampened spatially. Increasing the air volume in the Helmholtz chamber would result in a sharply decrease in the central frequency of the resonant gap and an extension in the bandwidth in the beginning, yet very slowly as the air volume is further augmented. Acoustic waves will experience a small amount of energy loss if the acoustic-structure interaction effect is considered. Also, the structure-borne sound will be induced because of the interaction effects. High pressure loadings on the system may bring in a shrink in the band gap; nevertheless, the features of broad band gaps of the system is still be maintained.

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Section: Introductionmentioning

confidence: 99%

Transmission of Low-Frequency Acoustic Waves in Seawater Piping Systems with Periodical and Adjustable Helmholtz Resonator

Liu

Yang

2017

JMSE

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“…11. Comparison of transmission loss spectrum for RANS and LES in simple expansion muffler [25] The results are presented to demonstrate inherent limitations associated with this approach, and validated for compressible Large Eddy Simulation (LES) of channel flow. The result show improvement in the prediction of vortex shedding inside the chamber is highlighted in comparison to the URANS method.…”

Section: Literature Rewievmentioning

confidence: 99%

“…Comparison of FFT of muffler without any flow and muffler at 10 m/s flow for generator frequency of 1500 Hz[25] …”

mentioning

confidence: 99%

A review of flow acoustic effects on a commercial automotive exhaust system - methods and materials

Mohamad

2019

Journal of Mechanical and Energy Engineering

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Literature review on flow acoustic methods and materials of an automotive muffler. a car is judged comfortable also depending on the acoustic level transmitted inside, and a thorough knowledge of acoustics of ducts and mufflers is needed for the design of efficient muffler configurations. Unstable exhaust gas at high temperature flowing from internal combustion engine manifold may cause of noise and vibrations conflicting with the high standard of acoustic comfort requested by this kind of vehicle. The basic gaols are to define most important methods to identify noise occur from the motion of fluid in case of turbulent model. Materials properties like velocity, temperature, thermal conductivity and density have been technical presented in this work.

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“…In addition the inlet conditions can be changed from a non-steady jet, to a variety of turbulent inlets. This includes a novel mixed-synthetic turbulent inlet developed by Singh (2012). This works by selecting an appropriate correlation function for space and time and also by selecting a true analytical representation of turbulence.…”

Section: Numerical Simulationmentioning

confidence: 99%

Numerical and Physical Simulation of a Thunderstorm Downburst

Jesson¹,

Haines²,

Singh³

et al. 2013

Proceedings of the Eighth Asia-Pacific Conference on Wind Engineering

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This paper describes work undertaken as a joint project between the University of Strathclyde (UoS) and the University of Birmingham (UoB) in the UK, aimed at simulating thunderstorm downbursts both physically and numerically. The UoB downburst simulator uses a 1m diameter, impinging jet with computercontrolled fans and flaps to physically simulate a downburst, with the data gathered used for calibration and validation of the numerical models developed at the UoS. These models, which are in an early stage of development, use novel inlet conditions to simulate the inflow, allowing more accurate and variable inflows. Wavelet analysis is used to compare the full-scale and physical simulation data, with correlation analyses (phaseplots) used to identify structures within the physical simulation flow field. Initial results show a good match between the physical simulations and full-scale, field data, and between the two sets of simulations.

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Large Eddy Simulation of acoustic pulse propagation and turbulent flow interaction in expansion mufflers

Cited by 25 publications

References 35 publications

Transmission of Low-Frequency Acoustic Waves in Seawater Piping Systems with Periodical and Adjustable Helmholtz Resonator

Transmission of Low-Frequency Acoustic Waves in Seawater Piping Systems with Periodical and Adjustable Helmholtz Resonator

A review of flow acoustic effects on a commercial automotive exhaust system - methods and materials

Numerical and Physical Simulation of a Thunderstorm Downburst

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