| A computational study of the effect of windscreen shape and flow resistivity on turbulent wind noise reduction. | |
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MedLine Citation:
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PMID: 21476631 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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In this paper, numerical simulations are used to study the turbulent wind noise reduction effect of microphone windscreens with varying shapes and flow resistivities. Typical windscreen shapes consisting of circular, elliptical, and rectangular cylinders are investigated. A turbulent environment is generated by placing a solid circular cylinder upstream of the microphone. An immersed-boundary method with a fifth-order weighted essentially non-oscillatory scheme is implemented to enhance the simulation accuracy for high-Reynolds number flow around the solid cylinder as well as at the interface between the open air and the porous material comprising the windscreen. The Navier-Stokes equations for incompressible flow are solved in the open air. For the flow inside the porous material, a modified form of the Zwikker-Kosten equation is solved. The results show that, on average, the circular and horizontal ellipse windscreens have similar overall wind noise reduction performance, while the horizontal ellipse windscreen with medium flow resistivity provides the most effective wind noise reduction among all the considered cases. The vertical ellipse windscreen with high flow resistivity, in particular, increases the wind noise because of increased self-generation of turbulence. |
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Authors:
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Ying Xu; Z C Zheng; D K Wilson |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 129 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-04-11 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 1740 Citation Subset: IM |
Affiliation:
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Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Science, Beijing, 100190, China. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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