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| 1 | Numerical simulations of vortex-induced vibrations of a flexible riser with different aspect ratiosin uniform and shear currents显示文摘This paper aimed at describing numerical simulations of vortex-induced vibrations(VIVs) of a long flexible riser with different length-to-diameter ratio(aspect ratio) in uniform and shear currents. Three aspect ratios were simulated: L/D= 500, 750 and 1 000. The simulation was carried out by the in-house computational fluid dynamics(CFD) solver viv-FOAM-SJTU developed by the authors, which was coupled with the strip method and developed on the OpenFOAM platform. Moreover, the radial basis function(RBF) dynamic grid technique is applied to the viv-FOAM-SJTU solver to simulate the VIV in both in-line(IL) and cross-flow(CF) directions of flexible riser with high aspect ratio. The validation of the benchmark case has been completed. With the same parameters, the aspect ratio shows a significant influence on VIV of a long flexible riser. The increase of aspect ratio exerted a strong effect on the IL equilibrium position of the riser while producing little effect on the curvature of riser. With the aspect ratio rose from 500 to 1 000, the maximum IL mean displacement increased from 3 times the diameter to 8 times the diameter. On the other hand, the vibration mode of the riser would increase with the increase of aspect ratio. When the aspect ratio was 500, the CF vibration was shown as a standing wave with a 3^(rd) order single mode. When the aspect ratio was 1 000, the modal weights of the 5^(th) and 6^(th) modes are high, serving as the dominant modes. The effect of the flow profile on the oscillating mode becomes more and more apparent when the aspect ratio is high, and the dominant mode of riser in shear flow is usually higher than that in uniform flow. When the aspect ratio was 750, the CF oscillations in both uniform flow and shear flow showed multi-mode vibration of the 4^(th) and 5^(th) mode. While, the dominant mode in uniform flow is the 4^(th) order, and the dominant mode in shear flow is the 5^(th) order. | 端木玉 邹璐 万德成 | 2017 | Journal of Hydrodynamics2017，29，6： | 6 |
| 2 | 有限流动水域浮体结构水力特性影响因素敏感性分析显示文摘浮体结构在有限流动水域运行过程中,水流特性变化复杂影响其安全稳定.依据正交设计以及物理模型试验,采用敏感性分析,将不同浮体体型和水力参数对浮体结构的倾覆性以及水流流动特性等指标的影响进行比较,通过极差分析得到各因素与指标的相关关系,并依据预测试验进行了验证.结果表明,不同指标受浮体体型及水力因素的影响存在很大的不同:浮体倾覆性受体型及水力因素影响较明显;特征流速受浮体体型影响较小,而受水位及来流流量的影响更敏感;浮体结构吃水深度的变化对回流区范围大小影响显著.试验有利于了解相关浮体式结构在有限流动水域运行过程中其周围流动特性变化规律,可为相关浮体稳定性设计提供参考. | 崔贞 傅宗甫 王劲 吕戎 王珊 | 2018 | 武汉大学学报(工学版)2018，51，11： | 5 |
| 3 | 浮体结构对下游水流结构影响显示文摘采用物理模型试验研究流动水域中浮体结构对下游水流流动结构的影响,对不同长高比浮体结构及其在不同水位差条件下浮体结构下游水流结构特征断面的流速分布、流速不均匀系数以及回流区长度进行分析。结果表明:浮体结构体型的变化对流速分布及流速不均匀系数的影响并不明显,水位差对两者均有较大的影响,其影响随着水位差的增大而增大;回流区长度受浮体结构体型以及水位差影响均较敏感,在实际运用中,应该主要关注水位差变化引起的水流流动结构的变化。 | 崔贞 傅宗甫 顾晓峰 王珊 倪英荐 | 2018 | 河海大学学报(自然科学版)2018，46，5： | 5 |
| 4 | A novel two-way method for dynamically coupling a hydrodynamic model with a discrete element model(DEM)显示文摘The effect of floating objects has so far been little considered for hazard risk assessment and structure design, despite being an important factor causing structural damage in flood-prone and coastal areas. In this work, a novel two-way method is proposed to fully couple a shock-capturing hydrodynamic model with a discrete element model(DEM) for simulation of complex debris-enriched flow hydrodynamics. After being validated against an idealized analytical test, the new coupled model is used to reproduce flume experiments of floating debris driven by dam-break waves. The numerical results agree satisfactorily with the experimental measurements, demonstrating the model's capability and efficiency in simulating complex fluid-debris interactions induced by violent shallow flows. | 熊焱 Qiuhua Liang Samantha Mahaffey Mohamed Rouainia 王岗 | 2018 | Journal of Hydrodynamics2018，30，5： | 3 |
| 5 | A numerical piston-type wave-maker toolbox for the open-source library OpenFOAM显示文摘A novel numerical piston-type wave-maker toolbox for the OpenFOAM is developed and demonstrated in this paper. This toolbox is implemented in C++ for improving the solutions of nonlinear wave problems in the field of hydrodynamics. As a toolbox that generates waves using the piston-type method only, it contains several frequently used functions, including the generation and the absorption of waves of various forms, an active absorption system and the porous media flow. Furthermore, to illustrate the operability of the toolbox, some validations and applications are presented, including the regular waves, the irregular waves, and the solitary waves. In each case, a satisfactory agreement is obtained in comparison with the published experimental or theoretical results,so this toolbox may be applied with a considerable confidence. | Dong-xu Wang Jia-wen Sun Jin-song Gui Zhe Ma De-zhi Ning Ke-zhao Fang | 2019 | Journal of Hydrodynamics2019，31，4： | 3 |
| 6 | A 3-D numerical study of solitary wave interaction with vertical cylinders using a parallelised particle-in-cell solver显示文摘This paper aims to provide a better understanding of the interaction between solitary waves and vertical circular cylinders. This is achieved via process based numerical modelling using the parallel particle-in-cell based incompressible flow solver PICIN. The numerical model solves the Navier-Stokes equations for free-surface flows and incorporates a Cartesian cut cell method for fluid-structure interaction. Solitary waves are generated using a piston-type wave paddle. The PICIN model is first validated using a test case that involves solitary wave scattering by a single vertical cylinder. Comparisons between the present results and experimental data show good agreement for the free surface elevations around the cylinder and the horizontal wave force on the cylinder. The model is then employed to investigate solitary wave interaction with a group of eleven vertical cylinders. The wave run-up and wave forces on the cylinders are discussed. | Qiang Chen Jun Zang David M.Kelly Aggelos S.Dimakopoulos | 2017 | Journal of Hydrodynamics2017，29，5： | 1 |
| 7 | Effect of the PTO damping force on the wave pressures on a 2-D wave energy converter显示文摘The information of the wave loads on a wave energy device in operational waves is required for designing an efficient wave energy system with high survivability. It is also required as a reference for numerical modeling. In this paper, a novel system, which integrates an oscillating wave energy converter with a pile-restrained floating breakwater, is experimentally investigated in a 2-D wave flume. The measurements of the wave pressure on the wet-surface of the device are made as the function of the power take-off(PTO) damping force. It is shown that the wave pressure is significantly affected by the PTO system, in particular, at the edges, and the wave pressure varies under different wave conditions. From the results, conclusions can be drawn on how the PTO damping force and wave conditions affect the loads on the device, which is of engineering concern for constructing safe and reliable devices. | 赵玄烈 宁德志 Malin G?teman 康海贵 | 2017 | Journal of Hydrodynamics2017，29，5： | 1 |
| 8 | 弧形防浪墙上波浪荷载的数值模拟显示文摘波浪冲击海岸结构物时往往会发生破碎,水的流态也从层流转变为湍流。基于开源计算流体力学工具OpenFOAM建立了数值波浪水槽,使用层流模型和浮力修正的k-ωSST湍流模型模拟弧形防浪墙上的波浪载荷。采用3组网格分析了弧形防浪墙上指定位置处的点压力,验证计算结果的收敛性。为了比较基于层流模型和湍流模型计算结果的精度,将弧形防浪墙上指定位置处的点压力和弧形防浪墙受到的总力的数值结果与相应的试验数据进行比较。结果表明,采用浮力修正的k-ωSST湍流模型可以提供更准确的预测结果。 | 雷雪莲 那鑫宇 孙亮 周银军 | 2022 | 水运工程2022，，7： | 0 |
| 9 | 二维浮体在聚焦波浪作用下的高频共振响应研究显示文摘基于势流理论建立二维完全非线性数值波浪水槽模型,利用该模型对二维驳船结构在非线性聚焦波作用下的高频共振响应(ringing现象)进行了研究.引入高阶边界元方法解决边界值问题,应用混合欧拉-拉格朗日方法和四阶龙格库塔法模拟结构物与波浪的相互作用.引入虚拟函数法耦合求解波浪载荷与物体运动.文中对聚焦波浪的传播特性进行了数值模拟,并将数值结果与试验值进行了对比验证.基于完全非线性数值波浪水槽,研究了聚焦波浪与结构物的相互作用问题,研究结果表明当聚焦波浪主频的三倍频等于或接近物体横摇方向固有频率时,物体在横摇方向将会产生ringing现象,在聚焦波浪经过浮体之后浮体仍会以高频振动的方式持续运动,进一步分析表明导致浮体发生ringing现象的入射波频率范围较大,在海洋结构物设计中应尽量避免入射波浪的三倍频接近浮体的固有频率. | 朱显玲 吴英友 齐江辉 | 2021 | 江苏科技大学学报(自然科学版)2021，35，1： | 0 |
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