Parametric studies on acoustics of corrugated tubes using large eddy simulation (LES)

Rajavel, B.; Prasad, M. G.

doi:10.3397/1/376222

Cited by 7 publications

(6 citation statements)

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“…Table 4 shows the structural parameters of each validation model, and the dimensions of each structural parameter are randomly selected. Table 5 shows the comparison between the simulation results and results calculated by equation (13). As seen from Table 5, the numerical simulation results are close to those calculated by equation 13, and the errors are within a reasonable range of 63.0%, which indicates that the empirical formulas are of high reliability and accuracy in predicting the cutoff frequencies of U-shaped corrugated pipes.…”

Section: Numerical Validation and Error Analysis Of The Empirical Forsupporting

confidence: 53%

“…Thus, to lower the prediction error of the calculation formula, the authors modify the largest coefficients and finally equation 12 Taking structural parameters (as shown in Table 1) and simulation results of lower and upper cutoff frequencies into equation 12, we obtain constants a and b for 21 groups. By averaging these values, the averaged constants a and b are obtained, which are 0.103 and 0.331, respectively, as shown in equation (13). In addition, the bandwidth between the lower and upper cutoff frequencies is obtained, as shown in equation (14) f L = 0:103c 0 h 0:71 c d Moreover, it should be noted that the corrugation length cannot be arbitrary.…”

Section: Comprehensive Effect Of Structural Parameters On Acoustic Tlmentioning

confidence: 99%

“…Research on “whistling” noise generated by airflow through the corrugated pipes is important; the noise not only causes serious environmental annoyance, but the associated structural vibrations can also lead to mechanical failures due to flow acoustic–structure coupling, especially in the offshore gas transportation systems. 1…”

Section: Introductionmentioning

confidence: 99%

“…The influence of the cavity length between the inlet and the single chamber on the whistle noise was explored, and he also noted that it was essential to stimulate the entrance vortex to create the whistling noise. Moreover, Rajavel and Prasad 13,14 carried out a study on the modeling and prediction of the resonant frequencies of corrugated pipes with airflow using FLUENT software based on the Large Eddy Simulation (LES) method. In 2013, Rajavel and Prasad 14 reviewed and summarized the work and research related to acoustics of corrugated pipes in detail.…”

Section: Introductionmentioning

confidence: 99%

“…Research on ''whistling'' noise generated by airflow through the corrugated pipes is important; the noise not only causes serious environmental annoyance, but the associated structural vibrations can also lead to mechanical failures due to flow acoustic-structure coupling, especially in the offshore gas transportation systems. 1 In 1922, Burstyn 2 first observed the ''whistling'' phenomenon in corrugated tubes. Later, a large amount of work was performed on the noise generated by the airflow in corrugated pipes.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical studies on the acoustic characteristics of the U-shaped corrugated pipes and application investigations

Xue

Sun

Jiao

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper presents a numerical study on the effect of structural parameters on acoustical transmission loss of U-shaped corrugated pipe using the control variable method. Then, the interactions between the cutoff frequencies and structural parameters are modeled based on the dimension analysis method using the numerical results. An investigation into the application of the U-shaped corrugated pipe into a simple expansion chamber muffler is carried out using both numerical and experimental methods. The results show that the U-shaped corrugated pipes have unique acoustic characteristics in noise attenuation, which resembles a resonant muffler. Furthermore, the numerical results of the transmission loss of U-shaped corrugated pipes are in good agreement with experimental results, which indicates that the transmission loss results obtained by acoustic finite element method is accurate. In addition, the corrugation height, corrugation length, and corrugation internal diameter are the factors that affect the acoustical behavior of the corrugated pipe most significantly. Moreover, the proposed empirical formulas for predicting the cutoff frequencies of U-shaped corrugated pipes are verified with high accuracy and with a prediction error within ±3.0%. What is more, the application of U-shaped corrugated pipes in expansion chamber muffler can effectively reduce the noise in the mid- to high-frequency band, which is useful to reduce the muffler volume and the amount of sound-absorbing material. Hence, automobile mufflers can be designed in a much more environmentally friendly way. In conclusion, this work could provide a theoretical basis for the acoustical design of U-shaped corrugated pipes, and it initiates a new research and application field for corrugated pipes as well.

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Section: Numerical Validation and Error Analysis Of The Empirical Forsupporting

confidence: 53%

Section: Comprehensive Effect Of Structural Parameters On Acoustic Tlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical studies on the acoustic characteristics of the U-shaped corrugated pipes and application investigations

Xue

Sun

Jiao

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

Experimental study on the comprehensive performance of the application of U-shaped corrugated pipes into reactive mufflers

Xue

Sun

2018

Applied Acoustics

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Numerical Study of an External Flow around a Corrugated Wing using Lattice Boltzmann Method

Singh,

Yidris,

Basri

et al. 2024

E3S Web Conf.

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During the course of recent studies on wings at low Reynold number, it was observed that wing corrugation is often assumed to play an important role as well. However, studies show that corrugation of the wing is intended for structural purposes, and not aerodynamics. Corrugated wings have the advantage of being light and sturdy. Therefore, the main aim of this study is to understand the flow behaviour of the corrugated insect-scale wing; by conducting, a geometric parametric study during a non-oscillatory flight at a particular low Reynolds number and at two different angles of attack. In this computational study, a 3-D section of the corrugated wing along the chord is considered. The lattice Boltzmann method offers an alternative framework compared to the Navier-Stokes simulations. An open-source Parallel Lattice Boltzmann Solver on a high-performance computing platform is used for this computational analysis. The present study shows that the flow-related performance of the corrugated wing in terms of forces and kinetic energy is predominantly governed by the geometric variations that can largely affect the formation of vortices and their mutual interaction. The study reveals that the presence of corrugation does not affect the enhancement of forces and corrugation near the leading edge generally affects the performance due to large flow separation affecting the suction.

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Parametric studies on acoustics of corrugated tubes using large eddy simulation (LES)

Cited by 7 publications

References 0 publications

Numerical studies on the acoustic characteristics of the U-shaped corrugated pipes and application investigations

Numerical studies on the acoustic characteristics of the U-shaped corrugated pipes and application investigations

Experimental study on the comprehensive performance of the application of U-shaped corrugated pipes into reactive mufflers

Numerical Study of an External Flow around a Corrugated Wing using Lattice Boltzmann Method

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