Low Mach number prediction of the acoustic signature of fractal-generated turbulence
► Acoustic properties of a fractal square grid and regular grid. ► Hybrid approach based on Lighthill’s analogy and Direct Numerical Simulation. ► Noise reduction for the fractal square grid. ► Well-defined peak at a Strouhal number between 0.2 and 0.3 for the fractal square grid, absent for the reg...
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| Veröffentlicht in: | The International journal of heat and fluid flow 2012-06, Vol.35, p.25-32 |
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| container_title | The International journal of heat and fluid flow |
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| creator | Laizet, Sylvain Fortuné, Véronique Lamballais, Eric Vassilicos, John Christos |
| description | ► Acoustic properties of a fractal square grid and regular grid. ► Hybrid approach based on Lighthill’s analogy and Direct Numerical Simulation. ► Noise reduction for the fractal square grid. ► Well-defined peak at a Strouhal number between 0.2 and 0.3 for the fractal square grid, absent for the regular grid.
In this work, we compare the acoustic properties of a fractal square grid with those of a regular grid by means of a hybrid approach based on Lighthill’s analogy and Direct Numerical Simulation (DNS). Our results show that the sound levels corresponding to our fractal square grid of three fractal iterations are significantly reduced by comparison to a regular grid of same porosity and mesh-based Reynolds number. We also find a well-defined peak at a Strouhal number between 0.2 and 0.3 in the acoustic spectrum of our fractal square grid which is absent in the case of our regular grid. We explain this effect in terms of a new criterion for quasi-periodic vortex shedding from a regular or fractal grid. |
| doi_str_mv | 10.1016/j.ijheatfluidflow.2012.03.004 |
| format | Article |
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In this work, we compare the acoustic properties of a fractal square grid with those of a regular grid by means of a hybrid approach based on Lighthill’s analogy and Direct Numerical Simulation (DNS). Our results show that the sound levels corresponding to our fractal square grid of three fractal iterations are significantly reduced by comparison to a regular grid of same porosity and mesh-based Reynolds number. We also find a well-defined peak at a Strouhal number between 0.2 and 0.3 in the acoustic spectrum of our fractal square grid which is absent in the case of our regular grid. We explain this effect in terms of a new criterion for quasi-periodic vortex shedding from a regular or fractal grid.</description><identifier>ISSN: 0142-727X</identifier><identifier>EISSN: 1879-2278</identifier><identifier>DOI: 10.1016/j.ijheatfluidflow.2012.03.004</identifier><language>eng</language><publisher>Elsevier Inc</publisher><subject>Acoustic predictions ; Acoustics ; Computational fluid dynamics ; Direct Numerical Simulation ; Engineering Sciences ; Fluid flow ; Fluids mechanics ; Fractal analysis ; Fractals ; Immersed boundary method ; Lighthill analogy ; Mechanics ; Multiscale-generated turbulence ; Signatures ; Turbulence ; Turbulent flow</subject><ispartof>The International journal of heat and fluid flow, 2012-06, Vol.35, p.25-32</ispartof><rights>2012 Elsevier Inc.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c400t-bfd6821a0349fa4ecd158b48d2f4dab1db23284b497132754f76f9d9d7f7988e3</citedby><cites>FETCH-LOGICAL-c400t-bfd6821a0349fa4ecd158b48d2f4dab1db23284b497132754f76f9d9d7f7988e3</cites><orcidid>0000-0003-2282-5786</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.ijheatfluidflow.2012.03.004$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>230,314,776,780,881,3536,27903,27904,45974</link.rule.ids><backlink>$$Uhttps://hal.science/hal-04451913$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Laizet, Sylvain</creatorcontrib><creatorcontrib>Fortuné, Véronique</creatorcontrib><creatorcontrib>Lamballais, Eric</creatorcontrib><creatorcontrib>Vassilicos, John Christos</creatorcontrib><title>Low Mach number prediction of the acoustic signature of fractal-generated turbulence</title><title>The International journal of heat and fluid flow</title><description>► Acoustic properties of a fractal square grid and regular grid. ► Hybrid approach based on Lighthill’s analogy and Direct Numerical Simulation. ► Noise reduction for the fractal square grid. ► Well-defined peak at a Strouhal number between 0.2 and 0.3 for the fractal square grid, absent for the regular grid.
In this work, we compare the acoustic properties of a fractal square grid with those of a regular grid by means of a hybrid approach based on Lighthill’s analogy and Direct Numerical Simulation (DNS). Our results show that the sound levels corresponding to our fractal square grid of three fractal iterations are significantly reduced by comparison to a regular grid of same porosity and mesh-based Reynolds number. We also find a well-defined peak at a Strouhal number between 0.2 and 0.3 in the acoustic spectrum of our fractal square grid which is absent in the case of our regular grid. 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In this work, we compare the acoustic properties of a fractal square grid with those of a regular grid by means of a hybrid approach based on Lighthill’s analogy and Direct Numerical Simulation (DNS). Our results show that the sound levels corresponding to our fractal square grid of three fractal iterations are significantly reduced by comparison to a regular grid of same porosity and mesh-based Reynolds number. We also find a well-defined peak at a Strouhal number between 0.2 and 0.3 in the acoustic spectrum of our fractal square grid which is absent in the case of our regular grid. We explain this effect in terms of a new criterion for quasi-periodic vortex shedding from a regular or fractal grid.</abstract><pub>Elsevier Inc</pub><doi>10.1016/j.ijheatfluidflow.2012.03.004</doi><tpages>8</tpages><orcidid>https://orcid.org/0000-0003-2282-5786</orcidid></addata></record> |
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| ispartof | The International journal of heat and fluid flow, 2012-06, Vol.35, p.25-32 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Acoustic predictions Acoustics Computational fluid dynamics Direct Numerical Simulation Engineering Sciences Fluid flow Fluids mechanics Fractal analysis Fractals Immersed boundary method Lighthill analogy Mechanics Multiscale-generated turbulence Signatures Turbulence Turbulent flow |
| title | Low Mach number prediction of the acoustic signature of fractal-generated turbulence |
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