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2025年8月8日
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2025年8月12日
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2025年8月15日
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2025年8月16日上午
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2025年8月16日下午
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2025年8月17日上午
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[口头报告]Active Jet Control Method for Vortex-Induced Loads on Rectangular Steel Cofferdams of Deep-Water Bridges
Active Jet Control Method for Vortex-Induced Loads on Rectangular Steel Cofferdams of Deep-Water Bridges
编号：27
稿件编号：5 访问权限：仅限参会人
更新：2025-07-29 15:12:50 浏览：51次
口头报告
报告开始：2025年08月15日 21:40 （Asia/Shanghai）
报告时间：10min
所在会议：[S1] 8月15日晚上 研究生分会 » [S1-3] 研究生分会场三
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摘要
Vortex-induced vibration (VIV) can compromise the safety and precision of segment construction for double-walled steel cofferdams, so it is crucial to explore methods to suppress VIV in deep-water bridge cofferdams. This study focuses on the common rectangular cross-section of cofferdams and proposes adding an active jet device to suppress VIV. A two-dimensional simplified model of the double-walled steel cofferdam was established using CFD software. By adjusting key parameters such as the jet exit position and jet momentum coefficient, this study investigates the suppressive effect of the active jet device on the flow-induced load around the steel cofferdam. Results show that the RNG k-ε model aligns well with experimental values under ultra-high Reynolds numbers. A backward jet with a jet momentum coefficient of 0.36 offers the best suppression of lateral force. Forward jets can effectively reduce the drag force on the double-walled steel cofferdam but may cause vortex shedding to deviate from the center, increasing the lateral force. Using both forward and backward jet control measures simultaneously achieves drag reduction similar to forward jet control alone but weakens the backward jet's suppressive effect on the lateral force.
关键字
Vortex-Induced Vibration; Ultra-High Reynolds Number; Deep-Water Steel Cofferdam
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