Transient study of an optimized waveguide sonic black hole with wave focusing properties
Sonic black holes (SBHs) are waveguides intended to slow down the wave propagation speed and focus the energy towards the end of the device. However, the extent to which these effects occur, as well as the degree of wave dispersion introduced, has not been systematically quantified. This article inv...
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EDP Sciences
2025-01-01
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| Series: | Acta Acustica |
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| Online Access: | https://acta-acustica.edpsciences.org/articles/aacus/full_html/2025/01/aacus240144/aacus240144.html |
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| _version_ | 1849330128162652160 |
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| author | Hassanpour Guilvaiee Hamideh Mousavi Abbas Berggren Martin Wadbro Eddie Kaltenbacher Manfred Toth Florian |
| author_facet | Hassanpour Guilvaiee Hamideh Mousavi Abbas Berggren Martin Wadbro Eddie Kaltenbacher Manfred Toth Florian |
| author_sort | Hassanpour Guilvaiee Hamideh |
| collection | DOAJ |
| description | Sonic black holes (SBHs) are waveguides intended to slow down the wave propagation speed and focus the energy towards the end of the device. However, the extent to which these effects occur, as well as the degree of wave dispersion introduced, has not been systematically quantified. This article investigates these aspects through transient finite-element computations, analyzing the properties of a novel, numerically optimized SBH with enhanced wave-focusing capabilities. The investigation utilizes the lossless acoustic wave equation as well as a linearized compressible flow formulation to account for viscothermal losses. We analyze the wave focusing and filtering properties of the SBH by monitoring the pressure amplitude and the transmission and reflection coefficients. Moreover, we examine the effective wave propagation speed along the centerline of SBH and assess the similarity of pressure wave packets using cross-correlations. Our results reveal that the optimized SBH not only enhances wave focusing but also on average effectively slows down wave propagation, demonstrating the device's potential as a true sonic black hole. By investigating two crucial aspects – wave-slowing effect and signal dispersion – that were not previously explored, we provide a deeper understanding of the device's functionality and operational mechanisms, including how its design influences wave-focusing performance and local wave speed. |
| format | Article |
| id | doaj-art-6f42d715c99b485b94bc8dcb0669ae0d |
| institution | Kabale University |
| issn | 2681-4617 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | Acta Acustica |
| spelling | doaj-art-6f42d715c99b485b94bc8dcb0669ae0d2025-08-20T03:47:03ZengEDP SciencesActa Acustica2681-46172025-01-0193610.1051/aacus/2025019aacus240144Transient study of an optimized waveguide sonic black hole with wave focusing propertiesHassanpour Guilvaiee Hamideh0Mousavi Abbas1https://orcid.org/0009-0006-4965-4963Berggren Martin2https://orcid.org/0000-0003-0473-3263Wadbro Eddie3https://orcid.org/0000-0001-8704-9584Kaltenbacher Manfred4https://orcid.org/0000-0001-5511-8610Toth Florian5https://orcid.org/0000-0002-4632-4436Institute of Mechanics and Mechatronics, TU WienFLOW, Engineering Mechanics, KTH Royal Institute of TechnologyDepartment of Computing Science, Umeå UniversityDepartment of Mathematics and Computer Science, Karlstad UniversityInstitute of Fundamentals and Theory in Electrical Engineering (IGTE), TU GrazInstitute of Mechanics and Mechatronics, TU WienSonic black holes (SBHs) are waveguides intended to slow down the wave propagation speed and focus the energy towards the end of the device. However, the extent to which these effects occur, as well as the degree of wave dispersion introduced, has not been systematically quantified. This article investigates these aspects through transient finite-element computations, analyzing the properties of a novel, numerically optimized SBH with enhanced wave-focusing capabilities. The investigation utilizes the lossless acoustic wave equation as well as a linearized compressible flow formulation to account for viscothermal losses. We analyze the wave focusing and filtering properties of the SBH by monitoring the pressure amplitude and the transmission and reflection coefficients. Moreover, we examine the effective wave propagation speed along the centerline of SBH and assess the similarity of pressure wave packets using cross-correlations. Our results reveal that the optimized SBH not only enhances wave focusing but also on average effectively slows down wave propagation, demonstrating the device's potential as a true sonic black hole. By investigating two crucial aspects – wave-slowing effect and signal dispersion – that were not previously explored, we provide a deeper understanding of the device's functionality and operational mechanisms, including how its design influences wave-focusing performance and local wave speed.https://acta-acustica.edpsciences.org/articles/aacus/full_html/2025/01/aacus240144/aacus240144.htmlsonic black holewave focusingwave slowdownfem |
| spellingShingle | Hassanpour Guilvaiee Hamideh Mousavi Abbas Berggren Martin Wadbro Eddie Kaltenbacher Manfred Toth Florian Transient study of an optimized waveguide sonic black hole with wave focusing properties Acta Acustica sonic black hole wave focusing wave slowdown fem |
| title | Transient study of an optimized waveguide sonic black hole with wave focusing properties |
| title_full | Transient study of an optimized waveguide sonic black hole with wave focusing properties |
| title_fullStr | Transient study of an optimized waveguide sonic black hole with wave focusing properties |
| title_full_unstemmed | Transient study of an optimized waveguide sonic black hole with wave focusing properties |
| title_short | Transient study of an optimized waveguide sonic black hole with wave focusing properties |
| title_sort | transient study of an optimized waveguide sonic black hole with wave focusing properties |
| topic | sonic black hole wave focusing wave slowdown fem |
| url | https://acta-acustica.edpsciences.org/articles/aacus/full_html/2025/01/aacus240144/aacus240144.html |
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