Numerical analysis of free surface flow over a submerged rectangular bridge deck

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题名:	Numerical analysis of free surface flow over a submerged rectangular bridge deck
作者:	朱佳仁;Chu, Chia-Ren;Chung, Chun-Hsuan;Wu, Tso-Ren;Wang, Chung-Yue
贡献者:	工學院土木工程學系
关键词:	Blockage;Bridge decks;Computational fluid dynamics;Cylinders;Drag coefficients;Fluid flow;Froude number;Mathematical models;Technical Papers
日期:	2016-12-01
上传时间:	2026-04-21 14:08:49 (UTC+8)
出版者:	American Society of Civil Engineers (ASCE);American Society of Civil Engineers
摘要:	摘要： AbstractThis study integrates a large eddy simulation model to investigate the effect of a submerged rectangular cylinder on the hydrodynamics of free surface flows. The simulation results are validated by the results of flume experiments. Then the numerical model is utilized to examine the influences of Reynolds number, Froude number, and blockage ratio on the flow field and the force coefficients of the deck. The simulation results reveal that the drag coefficient is dependent on the deck’s Froude number and blockage ratio of the bridge deck, rather than the Reynolds number. For both subcritical and transcritical flows, the drag coefficient increases as the blockage ratio increases. However, due to the wave-induced drag, the drag coefficient of the cylinder in transcritical flows is greater than that in subcritical flows with the same blockage ratio. On the other hand, the lift coefficient is a function of the submergence ratio and the deck’s Froude number. The separation shear flow on the upper side of the cylinder is constrained by the water surface when the submergence ratio h*<2.0, and resulting in an asymmetric pressure distribution on the upper and lower sides of the deck, which subsequently generates a downward force on the bridge deck. 出版者： American Society of Civil Engineers 出版日期： 2016-12-01 出處： Journal of Hydraulic Engineering, 2016-12, Vol.142 (12) 版權： 2016 American Society of Civil Engineers 識別號： ISSN: 0733-9429 識別號： EISSN: 1943-7900 識別號： DOI: 10.1061/(ASCE)HY.1943-7900.0001177
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