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http://dx.doi.org/10.12989/was.2013.16.5.517

Understanding of unsteady pressure fields on prisms based on covariance and spectral proper orthogonal decompositions  

Hoa, Le Thai (Wind Engineering Research Center, Tokyo Polytechnic University)
Tamura, Yukio (Department of Architectural Engineering, Tokyo Polytechnic University)
Matsumoto, Masaru (Department of Civil Engineering, Kyoto University)
Shirato, Hiromichi (Department of Civil Engineering, Kyoto University)
Publication Information
Wind and Structures / v.16, no.5, 2013 , pp. 517-540 More about this Journal
Abstract
This paper presents applications of proper orthogonal decomposition in both the time and frequency domains based on both cross spectral matrix and covariance matrix branches to analyze multi-variate unsteady pressure fields on prisms and to study spanwise and chordwise pressure distribution. Furthermore, modification of proper orthogonal decomposition is applied to a rectangular spanwise coherence matrix in order to investigate the spanwise correlation and coherence of the unsteady pressure fields. The unsteady pressure fields have been directly measured in wind tunnel tests on some typical prisms with slenderness ratios B/D=1, B/D=1 with a splitter plate in the wake, and B/D=5. Significance and contribution of the first covariance mode associated with the first principal coordinates as well as those of the first spectral eigenvalue and associated spectral mode are clarified by synthesis of the unsteady pressure fields and identification of intrinsic events inside the unsteady pressure fields. Spanwise coherence of the unsteady pressure fields has been mapped the first time ever for better understanding of their intrinsic characteristics.
Keywords
unsteady pressure; pressure distribution; spanwise correlation; spanwise coherence; coherence mapping; covariance proper orthogonal decomposition; spectral proper orthogonal decomposition;
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Times Cited By KSCI : 3  (Citation Analysis)
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