Analysis of acoustic networks including cavities by means of a linear finite volume method

Torregrosa, A.J.; Broatch, A.; Gil, Antonio; Moreno, D.

doi:10.1016/j.jsv.2012.05.023

Cited by 11 publications

(8 citation statements)

References 28 publications

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“…11, both for the transmitted pulses in the time domain and the resulting transmission loss in the frequency domain. In this last case, the transmission loss computed with the linear frequency-domain counterpart of the present method, which was described and validated in reference [34], is also included as a reference. In the time domain representation, it can be observed that the results of the original method are severely affected by spurious oscillations that extend along the whole decay of the pulse.…”

Section: Application To a Simple Geometrymentioning

confidence: 99%

On the effect of different flux limiters on the performance of an engine gas exchange gas-dynamic model

Torregrosa

Broatch

Arnau

et al. 2017

International Journal of Mechanical Sciences

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A suitable tool for the design of intake and exhaust systems of internal combustion engines is provided by time-domain non-linear finite volume models. These models, however, are affected by overshoots at discontinuities and numerical dispersion unless some flux limiter is used. In this paper, the effect of the most relevant of such flux limiters on a nonlinear staggered-mesh finite-volume model is evaluated. Flux-Corrected-Transport (FCT) and Total Variation Diminishing (TVD) schemes, together with a Momentum Diffusion Term (MDT) are presented for such a model, and the performance of the resulting methods is checked in different problems representative of the influence of engine gas exchange flows on engine performance and intake and exhaust noise. First, two onedimensional cases are considered: the shock-tube problem, and the propagation of a finite amplitude pressure pulse. Secondly, a simple but representative three-dimensional geometry is studied. From the results obtained, it can be concluded that, even if none of the methods is able to handle properly the three problems considered, the FCT method provides the best overall performance.

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Section: Application To a Simple Geometrymentioning

confidence: 99%

On the effect of different flux limiters on the performance of an engine gas exchange gas-dynamic model

Torregrosa

Broatch

Arnau

et al. 2017

International Journal of Mechanical Sciences

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“…First, an extension to absorbent materials of the linear finite volume method described in [12] and [13] was developed for the case in which, as expected, the material would behave as a bulk-reacting liner. Secondly, a transfer matrix model assuming a locally-reacting liner [14] was implemented, as the lack of information in the actual behavior of these novel materials does not permit to establish in advance which is the actual attenuation mechanism implied.…”

Section: Modelsmentioning

confidence: 99%

“…In the frame of the finite volume calculation described in [13], a given region is regarded as built of smaller volumes, and a staggered mesh system is used, i.e. a one-dimensional momentum equation is solved at the interfaces between volumes.…”

Section: Model With Bulk-reacting Materialsmentioning

confidence: 99%

Compact High-Pressure Intake Silencer with Multilayer Porous Material

Torregrosa¹,

Broatch²,

Raimbault³

et al. 2016

SAE Int. J. Passeng. Cars - Mech. Syst.

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Intake noise has become one the main concerns in the design of highly-supercharged downsized engines, which are expected to play a significant role in the upcoming years. Apart from the low frequencies associated with engine breathing, in these engines other frequency bands are also relevant which are related to the turbocharger operation, and which may radiate from the highpressure side from the compressor outlet to the charge air cooler. Medium frequencies may be controlled with the use of different typologies of resonators, but these are not so effective for relatively high frequencies. In this paper, the potential of the use of multi-layer porous materials to control those high frequencies is explored. The material sheets are located in the side chamber of an otherwise conventional resonator, thus providing a compact, lightweight and convenient arrangement. Several configurations have been tested in an impulse rig, without and with a superimposed mean flow, and the results have been analyzed with the help of a simple linear finite volume model accounting for the material. Then, the model has been used to explore different combinations of geometry and material properties, with the purpose of defining design guidelines for a proper choice of the device size and the material used, that may allow fulfilling the targeted value.

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“…5 The wide application of some commercial code in design further promotes the development of FEM and BEM. Up to now, FVM in this field is still a quite new topic and rarely reported.…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, FVM in this field is still a quite new topic and rarely reported. Torregrosa et al 5 successfully employed the frequency domain FVM to analyze three-dimensional (3D) complex acoustic networks in the absence of a mean flow and the results were validated by experimental or computational data. Their work provides a new alternative tool for predicting acoustic performance of mufflers.…”

Section: Introductionmentioning

confidence: 99%

A time-domain finite volume approach for prediction of muffler transmission loss including thermal effects

Xuan

Gong

Ming

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part C:

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A time-domain finite volume approach is presented for predicting the transmission loss of muffler including thermal effects with non-uniform sound speed field and density field, in which the acoustic wave equation in heterogeneous media is solved by using unstructured finite volume method with the temperature field specified or solved by some commercial code. An improved time-domain impulse method based on the absorbing boundary condition is applied to predict the acoustic attenuation characteristics of mufflers. The approach is validated by numerical simulations of a simple expansion chamber muffler and a complex muffler with five chambers. The predicted results agree well with the corresponding experimental ones and numerical ones obtained by finite element method with commercial code SYSNOISE. The results of both mufflers under different thermal conditions indicate that the temperature distribution has a significant influence on transmission loss. According to the analysis of a complex muffler with ideal medium, it is shown that the variation of working conditions can obviously affect density and sound speed distributions but have little influence on transmission loss. On the other hand, the obtained transmission loss with the solved temperature field deviates much from the one with specified uniform temperature field.

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Analysis of acoustic networks including cavities by means of a linear finite volume method

Cited by 11 publications

References 28 publications

On the effect of different flux limiters on the performance of an engine gas exchange gas-dynamic model

On the effect of different flux limiters on the performance of an engine gas exchange gas-dynamic model

Compact High-Pressure Intake Silencer with Multilayer Porous Material

A time-domain finite volume approach for prediction of muffler transmission loss including thermal effects

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