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Investigation of turbulence effects on the Aeroelastic Properties of a Truss Bridge Deck Section

Engineering 2017年第6期3卷 845-853页

作者： Hoang Trong Lam Hiroshi Katsuchi Hitoshi Yamada The University of Danang-University of Science and Technology Danang Vietnam Yokohama National University Yokohama 240-8501 Japan

This paper presents the flutter derivatives （FDs） extracted from a stochastic system identification （SSI） method under different turbulent flows, The objective of the study is to investigate the effects of oncoming turbulence on the flutter of suspended long-span bridges using a section model wind-tunnel test, Several wind-tunnel tests were performed on a truss bridge deck section with different oncoming turbulent properties involving reduced turbulence intensities and turbulent scales. This study includes an investigation of the effect of oncoming flows on modal dynamic responses. The transient and buffeting response data from the wind-tunnel test are analyzed using the system identification technique in extracting FDs, and the difficulties involved in this method are discussed. The time-domain SSI is applied to extract all FDs simultaneously from one and two degree-of-freedom （1DOF and 2DOF） systems, Finally, the results under different conditions are discussed and conclusions are formed.

关键词： Flutter derivatives System identification turbulence effect Buffeting response

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Simulation of Gravity Currents Using VOF Model

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China Ocean Engineering 2002年第4期17卷 525-536页

作者：邹建锋黄钰期应新亚任安禄 Department of Mechanics Zhijiang UniversityHangzhou 310027China Department of Civil Engineering Zhejiang UniversityHangzhou 310027China

By the Volume of Fluid (VOF) multiphase flow model two-dimensional gravity currents with three phases including air are numerically simulated in this article. The necessity of consideration of turbulence effect for high Reynolds numbers is demonstrated quantitatively by LES (the Large Eddy Simulation) turbulence model. The gravity currents are simulated for h not equal H as well as h = H, where h is the depth of the gravity current before the release and H is the depth of the intruded fluid. Uprising of swell occurs when a current flows horizontally into another lighter one for h not equal H. The problems under what condition the uprising of swell occurs and how long it takes are considered in this article. All the simulated results are in reasonable agreement with the experimental results available.

关键词： gravity current numerical simulation volume of fluid large eddy simulation turbulence effect

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