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Understanding of Unsteady Pressure Fields on Prisms based on Covariance and Spectral Proper Orthogonal Decompositions

Thai Hoa Le and Yukio Tamura and Masaru Matsumoto and Hiromichi Shirato (2013) Understanding of Unsteady Pressure Fields on Prisms based on Covariance and Spectral Proper Orthogonal Decompositions. Wind and Structures An International Journal, 16 (5). pp. 517-540. ISSN 1226-6116

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

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.

Item Type:Article
Subjects:Engineering Mechanics
Divisions:Faculty of Engineering Mechanics and Automation (FEMA)
ID Code:856
Deposited By: Ms. Cam Le Tran Thi
Deposited On:04 Dec 2015 04:26
Last Modified:04 Dec 2015 04:29

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