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Active Jet Control Method for Vortex-Induced Loads on Rectangular Steel Cofferdams of Deep-Water Bridges
ID：27 View Protection：ATTENDEE Updated Time：2025-07-29 15:12:50 Hits：780 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
Speaker
鲁子敬
研究生 长安大学

Submission Author
鲁子敬 长安大学
牛艳伟 长安大学
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Important Date

  • Conference Date

    Aug 15

    2025

    to

    Aug 17

    2025

  • Aug 08 2025

    Draft paper submission deadline

  • Aug 16 2025

    Contribution Submission Deadline

  • Aug 17 2025

    Registration deadline

Sponsored By
Lanzhou Jiaotong University
Tongji University
Organized By
兰州交通大学土木工程学院
中国建筑第六工程局有限公司
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