利用溃坝波实验和数值模拟对圆端围堰的整流罩进行水动力优化和性能验证

IF 4.3 2区 工程技术 Q1 ENGINEERING, OCEAN Applied Ocean Research Pub Date : 2024-10-04 DOI:10.1016/j.apor.2024.104247
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引用次数: 0

摘要

圆形围堰对大型海洋工程至关重要,但容易受到海浪、潮汐和风暴等复杂海洋环境的影响。增强这些围堰的水动力性能对于提高海洋施工的安全性和效率至关重要。本研究介绍了一种新型整流罩设计,旨在减少海啸准稳定阶段的水流阻力。利用计算流体动力学(CFD)模拟分析了流场,并采用自适应代用模型优化了参数化的整流罩形状。结果表明,优化后的整流罩形状能显著抑制涡流脱落,从而使流动条件下的阻力系数降低了 16.59%,升力系数降低了 44.3%。对 R1 和 R0 两种设计进行了溃坝波的实验和数值模拟。通过比较它们的流场和受力特性,发现 R1 在冲击阶段能有效地分离波浪,降低波浪爬升高度,减少冲击载荷。在准稳定阶段,R1 可减轻阻塞效应,减少前后液面差,从而降低流力。实验数据进一步表明,当下游为干燥河床时,R1 的减载效果尤为显著,在冲击阶段最大减幅为 45.62%,在准稳定阶段最大减幅为 28.75%。当河床潮湿时,最大荷载降低率分别为 18.04 % 和 8.72 %。因此,R1 不仅能减小圆端围堰在水流作用下的阻力,还能减小其在极端波浪力作用下的阻力,为推进海洋工程设计提供了宝贵的启示。
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Hydrodynamic optimization and performance verification of fairings for round-ended cofferdams using dam-break wave experiments and numerical simulations
Round-ended cofferdams are crucial for large-scale marine projects but are vulnerable to the complex marine environment, including waves, tides, and storms. Enhancing the hydrodynamic performance of these cofferdams is essential for improving safety and efficiency in marine construction. This study introduces a novel fairing design aimed at reducing water flow resistance during the quasi-stable stage of a tsunami. The flow field is analyzed using computational fluid dynamics (CFD) simulations, and an adaptive surrogate model is employed to optimize the parameterized fairing shape. The results demonstrate that the optimized shape significantly suppresses vortex shedding, leading to a 16.59 % reduction in the drag coefficient and a 44.3 % reduction in the lift coefficient under flow conditions. Experimental and numerical simulations of dam-break waves are conducted for two designs, R1 and R0. By comparing their flow field and force characteristics, it is found that R1 effectively separates waves during the impulse stage, reduces wave climb height, and decreases impact loads. In the quasi-stable stage, R1 mitigates the blockage effect, reducing the liquid level difference between the front and back, and thus lowering flow forces. Experimental data further reveals that when the downstream is a dry riverbed, R1′s load reduction is particularly notable, with maximum reductions of 45.62 % in the impulse stage and 28.75 % in the quasi-stable stage. When the riverbed is wet, the maximum load reduction rates are 18.04 % and 8.72 %, respectively. Therefore, R1 not only reduces the resistance of round-end cofferdams under water currents but also under extreme wave forces, providing valuable insights for advancing ocean engineering design.
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来源期刊
Applied Ocean Research
Applied Ocean Research 地学-工程:大洋
CiteScore
8.70
自引率
7.00%
发文量
316
审稿时长
59 days
期刊介绍: The aim of Applied Ocean Research is to encourage the submission of papers that advance the state of knowledge in a range of topics relevant to ocean engineering.
期刊最新文献
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