Boundary element method to analyze acoustic scattering from a coupled swimbladder-fish body configuration

González, Juan D.; Lavia, Edmundo F.; Blanc, Silvia; Maas, Martín; Madirolas, Adrián

doi:10.1016/j.jsv.2020.115609

Cited by 9 publications

(6 citation statements)

References 34 publications

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“…In this case, the computational implementation is strongly based on a previous work that uses the traditional free-space Green function as integral kernel. [30] Thus, the numerical evaluation of the matrix components at Eq. ( 16) is carried out by taking that previous implementation and changing the Green function.…”

Section: Methodsmentioning

confidence: 99%

“…Panels (a) show the benchmark solution whereas panels (b) are the results provided by the BEM model. In all the figures, colorbars are saturated in the interval [30,100] dB for clarity purposes in the comparison. The evaluations are visually in good agreement although there are some numerical artifacts near the interface line, which are a consequence of the evaluation point closeness in regard the triangle' sides in the interface mesh.…”

Section: Bem Model Applied To the Pekeris Waveguidementioning

confidence: 99%

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Three-dimensional acoustic propagation model for shallow waters based on an indirect boundary element method

Lavia¹,

González²,

Blanc³

2023

Chinese Phys. B

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This work has a two-fold purpose. On the one hand, the theoretical formulation of a 3D acoustic propagation model for shallow waters with a constant sound speed, based on the Boundary Element Method (BEM) which uses a half-space Green function instead of the more conventional free-space Green function, is presented. On the other hand, a numerical implementation aimed to explore the formulation in simple idealized cases –controlled by a few parameters– which provides necessary tests for the accuracy and performance of the model, is illustrated. The half-space Green’s function, which has been previously used in scattering and diffraction, adds terms to the usual expressions of the integral operators without altering their continuity properties. Verifications against the wavenumber integration solution of the Pekeris waveguide suggest that the model allows an adequate prediction for the acoustic field. Likewise, numerical experiments in relation to the necessary mesh size for the description of the water-marine sediment interface lead to the conclusion that a TL prediction with acceptable accuracy can be obtained with the use of a limited mesh around the desired evaluation region.

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Section: Methodsmentioning

confidence: 99%

Section: Bem Model Applied To the Pekeris Waveguidementioning

confidence: 99%

Three-dimensional acoustic propagation model for shallow waters based on an indirect boundary element method

Lavia¹,

González²,

Blanc³

2023

Chinese Phys. B

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show abstract

“…Numerical evaluation of the operators can be cumbersome since it involves the resolution of integral singularities. In this case, computer implementation is strongly based on the previous work of [20] that uses the traditional free-space Green function as integral kernel. Thus, the numerical evaluation of the matrix components at Eq.…”

Section: Methodsmentioning

confidence: 99%

A 3D acoustic propagation model for shallow waters based on an indirect Boundary Element Method

Lavia¹,

Gonzalez²,

Blanc³

2022

Preprint

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The purpose of this work is twofold: (a) To present the theoretical formulation of a 3D acoustic propagation model based on a Boundary Element Method (BEM), which uses a halfspace Green function in place of the more conventional free-space Green function and (b) to show a numerical implementation aimed to explore the formulation in simple idealized cases -controlled by a few parameters-, and provides necessary tests for the accuracy and performance of the model. The half-space Green's function, which has been used previously in scattering and diffraction, adds terms to the usual expressions of the integral operators without altering their continuity properties. Verifications against the Pekeris waveguide suggest that the model allows an adequately prediction for the acoustic field. Likewise, numerical explorations in relation to the necessary mesh size for the description of the water-sediment interface allow us to conclude that a TL prediction with acceptable accuracy can be obtained with the use of a bounded mesh around the desired evaluation region.

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“…They account for the finer morphometric variation on the surface resulting in precise estimates of acoustic reflectivity which can help to draw broadband frequency patterns, which in turn can provide information on the target and swimbladder properties 37 . BEM and FEM models allow computing the backscatter from any shape and material properties 38 and they are currently accessible through several licensed and open-source software such as COMSOL Multiphysics (v.6) 39 and Coupled BEM in Julia 38 or BEMPP in Python 40 . The frequency response over a broad frequency range can potentially lead to an improved capability of distinguishing between acoustically similar species and size groups of a single species 41,42 .…”

Section: Introductionmentioning

confidence: 99%

Characterization of European sprat acoustic backscatter

Palermino,

Gastauer,

Felice

et al. 2024

Preprint

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In fisheries acoustics, the identification of targets and precise translation of acoustic energy into biological meaningful metrics remains a challenge. Backscattering cross-section, or its logarithmic form, Target Strength (TS, dB re 1 m2), is a key parameter in this process. There are numerous studies on commercially important species, but few studies are available on commercially non-important species, such as the European sprat in the Mediterranean Sea. The application of backscattering models can improve our understanding of the acoustic properties of these species, allowing the manipulation of key parameters affecting the TS. Here we applied several backscattering models, on three-dimensional swimbladder shapes derived from Computer Tomography (CT) scans, of sprat collected during the MEDiterranean International Acoustic Survey (MEDIAS) in 2021. The theoretical TS pattern was compared with empirical TS revealing a good fit at 38 and 70 kHz between 0° (broadside incidence) and − 20° and significant differences at higher frequencies and tilt angles. This study provides estimates of the relative frequency response and broadband backscatter of sprat in the Mediterranean Sea. Moreover, the relationship of TS with fish length at 38 kHz yields a new relevant conversion parameter (b20) of -68.3 dB re 1 m2 for European sprat in the Mediterranean Sea.

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Boundary element method to analyze acoustic scattering from a coupled swimbladder-fish body configuration

Cited by 9 publications

References 34 publications

Three-dimensional acoustic propagation model for shallow waters based on an indirect boundary element method

Three-dimensional acoustic propagation model for shallow waters based on an indirect boundary element method

A 3D acoustic propagation model for shallow waters based on an indirect Boundary Element Method

Characterization of European sprat acoustic backscatter

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