論文

査読有り
2013年12月

Linearized Euler simulations of sound propagation with wind effects over a reconstructed urban terrain using digital geographic information

APPLIED ACOUSTICS
  • Takuya Oshima
  • ,
  • Masashi Imano
  • ,
  • Yasuhiro Hiraguri
  • ,
  • Yoshikazu Kamoshida

74
12
開始ページ
1354
終了ページ
1366
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.apacoust.2013.05.006
出版者・発行元
ELSEVIER SCI LTD

The procedure of sound propagation calculation employing the linearized Euler (LE) model has been known to be complex because the procedure requires a chaining of two distinct simulations, namely a fluid dynamics simulation (CFD) in order to solve the background flow field, and a succeeding sound propagation simulation using the LE model over the flow field. The complexity is considered one of the main reasons why the most of the applications of the model remain in investigations assuming highly abstract geometries. In the study, a streamlined workflow is established for LE simulations over a complex urban terrain with its reconstruction utilizing digital geographic models which provide building outline maps and digital surface elevation information. Focus is given to automatic geometry reconstruction and mesh generations of realistic urban terrain. Subsequent processes of CFD and LE simulations are validated through comparisons with published results of wind-tunnel tests and with theoretical solutions. The workflow is deployed to an actual urban terrain of Nagaoka, Japan. The present technique generates a good reconstruction of urban geometry and subsequent split-hexahedral unstructured grid for CFD software and uniform structured mesh for finite-difference LE simulation. The numerical experiments show differences of up to 5 dB between sound pressure levels obtained by the present reconstruction technique and those by a flat-roof geometry. Also, the wind effects are mostly representable in terms of the source-observation point distance in spite of the complex urban configuration. Subtle wind effects of less than 0.5 dB are observed in crosswind condition as well. (c) 2013 Elsevier Ltd. All rights reserved.


リンク情報
DOI
https://doi.org/10.1016/j.apacoust.2013.05.006
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000324227100006&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.apacoust.2013.05.006
  • ISSN : 0003-682X
  • Web of Science ID : WOS:000324227100006

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