- Important Date
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August 8, 2025
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August 12, 2025
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August 15, 2025
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August 16, 2025, morning
Opening ceremony and conference reports
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August 16, 2025, afternoon
session report
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August 17, 2025, morning
Session report and closing ceremony
[Oral Presentation]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
ID：27
Submission ID：5 View Protection：ATTENDEE
Updated Time：2025-07-29 15:12:50 Hits：54
Oral Presentation
Start Time：2025-08-15 21:40 （Asia/Shanghai）
Duration：10min
Session：[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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Abstract
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.
Keywords
Vortex-Induced Vibration; Ultra-High Reynolds Number; Deep-Water Steel Cofferdam
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