Journal of Hydrodynamics最新文献_第4页

The benchmark test of CFDs using an EFD database of RIOS bulk carriers advancing in waves 利用RIOS散货船的EFD数据库对cfd进行基准测试

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-06-15 DOI: 10.1007/s42241-026-0044-7

Toshiki Kashiwagi, Hidetsugu Iwashita

{"title":"The benchmark test of CFDs using an EFD database of RIOS bulk carriers advancing in waves","authors":"Toshiki Kashiwagi, Hidetsugu Iwashita","doi":"10.1007/s42241-026-0044-7","DOIUrl":"10.1007/s42241-026-0044-7","url":null,"abstract":"<div>Nowadays, a Navier-Stokes solver based computational fluid dynamics (CFD) begins to be applied to ship seakeeping problems. However, most of its validation is based on a comparison of integrated values, e.g. wave-induced ship motions and/or hydrodynamic forces. For the validation of such a sophisticated calculation method, more detailed and convincing validation is desired using local physical quantities such as unsteady ship-side waves (SSWs) and spatial distributions of wave-induced unsteady pressure on the ship hull. This paper demonstrates the benchmark test of several calculation methods (CFD in a broad sense), i.e., the strip method, enhanced unified theory (EUT), Rankine panel method (RPM), and CFD (FINE/Marine) by comparing with experimental results of RIOS bulk carrier models advancing in regular head waves. Not only the integrated values represented by ship motions but also the local physical values, e.g. SSWs and pressure distributions are used for the validation to clarify the differences among the calculation methods. In the measurement of SSWs, a new method using high-speed cameras and multi-laser sheets is presented.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"327 - 337"},"PeriodicalIF":4.0,"publicationDate":"2026-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental study on sloshing flow in cylindrical tanks with internal structures 带有内部结构的圆柱形储罐内晃动流动的实验研究

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-06-10 DOI: 10.1007/s42241-026-0043-8

Taehyun Park, Jaeyeon Hwang, Yonghwan Kim, Cheon-Jin Park, Jeoungkyu Lee

{"title":"Experimental study on sloshing flow in cylindrical tanks with internal structures","authors":"Taehyun Park, Jaeyeon Hwang, Yonghwan Kim, Cheon-Jin Park, Jeoungkyu Lee","doi":"10.1007/s42241-026-0043-8","DOIUrl":"10.1007/s42241-026-0043-8","url":null,"abstract":"<div>In this study, a series of sloshing model tests were conducted on a cylindrical type-C tank to investigate the effects of internal members, such as a swash bulkhead and support rings. Under regular pitch motions, sloshing impact pressures and global forces at the tank base were simultaneously measured at high filling levels over excitation frequencies near its longitudinal resonance. Results showed that the internal members significantly modify both global and localized sloshing responses by altering free-surface patterns, momentum exchange pathways, and resonance behavior. Depending on the internal configuration, internal flow exhibited noticeable asymmetry, and the effective resonance frequency shifted. The global forces reached their maximum at intermediate filling levels and were strongly influenced by the geometric arrangement of the internal members. When the inner ring of the support ring or the opening of the swash bulkhead was located close to the free surface, horizontal fluid transport was restricted and vertical jet formation was promoted, leading to an upward concentration and localization of impact loads along spherical endcaps. These results demonstrate that the geometry and placement of internal members in type-C tanks not only attenuate sloshing loads but also actively redistribute fluid momentum, providing a quantitative basis for optimizing the internal-structure design and thereby improving operational performance and structural safety.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"285 - 296"},"PeriodicalIF":4.0,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Nonlinear state shift: Morphodynamic reconfiguration under progressive vegetation uprooting on alternate bars 非线性状态转移：交替沙洲上植被连根拔起下的形态动力学重构

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-06-08 DOI: 10.1007/s42241-026-0049-2

Saqib Habib, Norio Tanaka

{"title":"A Nonlinear state shift: Morphodynamic reconfiguration under progressive vegetation uprooting on alternate bars","authors":"Saqib Habib, Norio Tanaka","doi":"10.1007/s42241-026-0049-2","DOIUrl":"10.1007/s42241-026-0049-2","url":null,"abstract":"<div>Vegetation fundamentally regulates river-bar morphology. However, the morphodynamic response of bars to the progressive removal of vegetation remains insufficiently characterized. Flume experiments with two steady flows were conducted using a two-stage uprooting protocol: Stage 1 trimmed about 30% from the leading edge of an apex patch; Stage 2 cleared the remainder. Bed evolution was analyzed using depth-normalized relief, areal aggradation-degradation fractions, lateral mass-balance metrics, and thalweg-based wavelength. Partial removal of 30% of the vegetation (Stage 1) produced a sharp morphodynamic shift: The area experiencing net aggradation increased from roughly 20%–25% to 56%–77% of the bar surface. This indicates a transition from scour-dominated to deposition-dominated adjustment and a reorganization of the bar-wake system. In contrast, complete removal (Stage 2) stabilized the deposition-dominated bar configuration established by Stage 1, with deposition remaining dominant and the flow wake lengthening and reattaching farther downstream. At higher discharge (Q2 = 0.003 m3/s), bar wavelength expanded by ∼10%–59%, reflecting longer wakes and reduced roughness, while the lower discharge (Q1 = 0.002 5 m3/s) mainly deepened local relief without major re-spacing. Morphodynamically, Stage 1 drives the reconfiguration, converting a forced, asymmetric deflector bar into a diffusively depositional form. Subsequently, Stage 2 acts as the stabilizer, allowing the reach to relax toward a free-bar template governed by intrinsic flow-sediment dynamics. Practically, these findings highlight that partial vegetation loss can induce instability, initially producing a localized scour hotspot at the patch’s new leading edge, even as it drives the bar into an overall deposition-dominated state. In contrast, complete clearing tends to redistribute sediment more evenly and stabilize bar spacing, offering direct guidance for river restoration and vegetation-management design.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 3","pages":"560 - 578"},"PeriodicalIF":4.0,"publicationDate":"2026-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148807309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An efficient approach to CFD simulations with small ships maneuvering in the wave field of larger ships via optimized forcing zones 基于优化强迫区的小型船舶在大型船舶波场中机动的CFD模拟方法

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-06-05 DOI: 10.1007/s42241-026-0042-9

Lukas Altenbach, Robinson Perić, Jannes Berndt, Norbert Stuntz, Moustafa Abdel-Maksoud

{"title":"An efficient approach to CFD simulations with small ships maneuvering in the wave field of larger ships via optimized forcing zones","authors":"Lukas Altenbach, Robinson Perić, Jannes Berndt, Norbert Stuntz, Moustafa Abdel-Maksoud","doi":"10.1007/s42241-026-0042-9","DOIUrl":"10.1007/s42241-026-0042-9","url":null,"abstract":"<div>The maneuvering of small ships within the wave field of larger ships is a common application in practical ship hydrodynamics. Examples include optimization of launch and recovery operations regarding ship motions, interaction between a tugboat and a cargo ship, or the safe approach of a patrol boat to a larger vessel. Due to the pronounced scale disparity between vessels, such operations are difficult to realize in wave-tank experiments. Computational fluid dynamics (CFD) simulations of such operations are challenging due to the comparatively large computational effort: The larger ship requires a comparatively large domain, while the smaller ship may require finer mesh resolution and time steps. The present work proposes an efficient approach to perform CFD simulations for such applications. By using forcing zones with optimized coefficients, the size of the computational domain can be reduced to the vicinity of the small ship, and the flow near the domain boundaries is forced towards the wave field solution of the larger ship. This corresponds to a one-way coupling approach, in which the larger ship is not affected by the small ship. The flow fields near the large ship are extracted from a CFD simulation. In the present study, the large ship is moving with constant speed in calm water, and the converged wave field solution is stored and used to define the boundary conditions for the CFD simulation with the small ship. An overtaking maneuver of the small ship is investigated. The resulting ship motions match closely with those of a simulation conducted for the two vessels in a single simulation domain. The proposed approach reduces computational cost by up to 87%. Therefore, the approach is particularly suitable when studying the effects of different ship maneuvers in the same wave fields, as in the aforementioned applications.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"305 - 314"},"PeriodicalIF":4.0,"publicationDate":"2026-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study of wave breaking under wind forcing 风作用下波浪破碎的数值研究

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-06-02 DOI: 10.1007/s42241-026-0040-y

Yu-ming Shao, Jian-hua Wang, De-cheng Wan

引用次数: 0

Addressing scale discrepancy in wind turbine wake turbulent kinetic energy predictions via quantile transformation and bayesian deep learning 基于分位数变换和贝叶斯深度学习的风力发电机尾流湍流动能预测中的尺度差异

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-06-02 DOI: 10.1007/s42241-026-0041-x

Zhi-hao Tang, Mao-kun Ye, Yi-sheng Yao, De-cheng Wan

{"title":"Addressing scale discrepancy in wind turbine wake turbulent kinetic energy predictions via quantile transformation and bayesian deep learning","authors":"Zhi-hao Tang, Mao-kun Ye, Yi-sheng Yao, De-cheng Wan","doi":"10.1007/s42241-026-0041-x","DOIUrl":"10.1007/s42241-026-0041-x","url":null,"abstract":"<div>Wind energy is a crucial component of the global transition to green energy. The development of wind resources relies on wind turbines, which are typically clustered in wind farms. The wake generated by upstream turbines significantly impacts downstream turbines, leading to reduced power generation and increased fatigue loads. turbulent kinetic energy (TKE) is a key physical quantity in wind turbine wake prediction, governing wake mixing and recovery processes, thus holding substantial research importance. However, a major challenge in data-driven wake prediction is the significant scale discrepancy in TKE distribution. TKE values are predominantly low across most of the wake field, with only a few critical regions (e.g., behind the blade tips and hub) exhibiting high values. This highly skewed distribution causes conventional data-driven models to often treat these high-value points as outliers, leading to poor learning of critical features and increased model uncertainty. This study proposes a novel data-driven framework combining quantile transformation and Bayesian deep learning to accurately predict the TKE distribution in wind turbine wakes. The nonlinear quantile transformation effectively mitigates the scale discrepancy issue, enabling the neural network to learn features from the highly imbalanced data more effectively. Meanwhile, the Bayesian deep learning approach quantifies the predictive uncertainty, enhancing the model’s reliability. The proposed method is validated against high-fidelity computational fluid dynamics (CFD) data, demonstrating superior performance compared with traditional scaling methods like Min-Max scaler.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"315 - 326"},"PeriodicalIF":4.0,"publicationDate":"2026-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation on the effect of blade profile optimization on power density and cavitation performance of an axial-flow pump 叶片型线优化对轴流泵功率密度和空化性能影响的研究

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-05-26 DOI: 10.1007/s42241-026-0039-4

Deng-feng Yang, Hong-xun Chen, Jin Li, Zheng Ma

引用次数: 0

Optimization of structural parameters for deep-well internal circulation jet pump based on numerical simulation 基于数值模拟的深井内循环喷射泵结构参数优化

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-05-20 DOI: 10.1007/s42241-026-0038-5

Ai-hua Li, Zhi-hui Liu, Yong-hai Gao, Xin-xin Zhao

{"title":"Optimization of structural parameters for deep-well internal circulation jet pump based on numerical simulation","authors":"Ai-hua Li, Zhi-hui Liu, Yong-hai Gao, Xin-xin Zhao","doi":"10.1007/s42241-026-0038-5","DOIUrl":"10.1007/s42241-026-0038-5","url":null,"abstract":"<div>During deep-well exploration and testing, artificial lift and drainage systems predominantly rely on advanced pump technologies. Internal circulation jet pumps demonstrate superior performance among available options. To optimize both lifting efficiency and production rates under deep-well operational conditions, a theoretical model was developed and the flow dynamics were analyzed through numerical simulations. Post-simulation, the spatial distributions of flow velocity, pressure, and oil-water two-phase flow within the jet pump were obtained. With a certain nozzle diameter (dnozzle = 3 mm), some other key structural parameters–including throat inlet diameter (dthroat = 1.12dnozzle–1.58dnozzle), throat-nozzle axial spacing (e = 0.50dnozzle–2.33dnozzle), throat pipe length (lthroat = 5dthroat–8dthroat) and throat divergence angle (αthroat = 0°–4.25°), diffusion pipe diameter (ddiffusion), diffusion pipe length (ldiffusion = 31ddiffusion–42ddiffusion) and diffusion angle (αdiffusion = 5°–9°)–were systematically investigated to maximize the pressure differential between the nozzle exit and the reservoir formation. The conclusions reveal that the optimized configuration, compared with the original designs, achieves a 21.3% increase in maximum suction capacity (22.2 MPa to 26.93 MPa), thereby enhancing heavy oil production efficiency. This systematic approach establishes a comprehensive design framework for next-generation jet pump systems.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"353 - 358"},"PeriodicalIF":4.0,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Steady-state resonant waves in a fully nonlinear circular wave basin 全非线性圆波盆中的稳态共振波

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-05-20 DOI: 10.1007/s42241-026-0037-6

Lei Fu, Robert Mayon, De-zhi Ning

{"title":"Steady-state resonant waves in a fully nonlinear circular wave basin","authors":"Lei Fu, Robert Mayon, De-zhi Ning","doi":"10.1007/s42241-026-0037-6","DOIUrl":"10.1007/s42241-026-0037-6","url":null,"abstract":"<div>This study presents a nonlinear symmetric steady-state resonant wave system induced by circumferentially generated travelling waves. The resonant modes exhibit physical similarities with the vibration configurations of acoustic poles. By controlling the angular modulation factor, steady-state monopole, dipole, and quadrupole resonant waves are systematically simulated and investigated. A fully nonlinear Higher-Order Boundary Element Method (HOBEM) is employed in a circular numerical wave basin to resolve wave interactions in the time domain. Multidirectional wave velocity allocation is achieved through cylindrical surface-based wave sources, with an annular damping layer implemented as the outlet boundary to maintain steady resonance states. The different resonance modes exhibit distinct spatial symmetries and peak-trough distributions, all conforming to Bessel-like functions. The nodal lines, which serve as phase-reversal boundaries in the standing wave field, demarcate the resonant wave patterns. Three-dimensional interference of high-frequency waves results in significant amplification of local peaks. The results also reveal that resonance strongly excites wave nonlinearity and amplifies nonlinear coupling, leading to an increased manifestation of higher-order wave components. Strong wave nonlinearity alters the shape of the resonant waves, enhances the amplitude of the wave crests, and induces shifts in the nodal lines and peak positions.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"338 - 352"},"PeriodicalIF":4.0,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the effective distance of cavitation erosion in the cavitation erosion risk prediction of the U-shaped cavity u型空化风险预测中空化侵蚀有效距离分析

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-05-18 DOI: 10.1007/s42241-026-0036-7

Jie Wu, Shi-jie Zhang, Jia-mei Ma, Pei-jian Zhou, Wen-wu Zhang, Zhi-feng Yao

{"title":"Analysis of the effective distance of cavitation erosion in the cavitation erosion risk prediction of the U-shaped cavity","authors":"Jie Wu, Shi-jie Zhang, Jia-mei Ma, Pei-jian Zhou, Wen-wu Zhang, Zhi-feng Yao","doi":"10.1007/s42241-026-0036-7","DOIUrl":"10.1007/s42241-026-0036-7","url":null,"abstract":"<div>Aiming at the shedding and collapse characteristics of the U-shaped cavity, this paper first accurately simulates the cavitation flow using the modified SST turbulence model and the Sauer cavitation model. On this basis, the effective distance of cavitation erosion in the risk prediction of the U-shaped cavity is studied based on the principle of energy transfer. Furthermore, the development process and the characteristics of cavitation erosion risk of the U-shaped cavity are analyzed. It is found that the vapor phase volume fraction near the surface at the location of the cloud cavity is smaller due to the effect of the re-entrant jet, and when the recognition radius is too small, it cannot fully reflect the volume change process of the cavity collapse near the surface. The cavitation erosion risk caused by the U-shaped cavity at the trailing edge is significantly higher than that corresponding to the cloud cavity. When the number of layers of extracted nodes is too large, exceeding the effective distance of cavitation erosion for the cavitation bubble collapse, the cavitation erosion risk of the cavity at bottom corners of both legs before the U-shaped cavity reaches the trailing edge will be over-predicted. The cavitation erosion risk mainly comes from the collapse of the shed cavity before the complete creation of the U-shaped cavity. In addition, the front end of the shed cavity has a higher risk. The U-shaped cavity mainly causes cavitation erosion near the trailing edge.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"239 - 252"},"PeriodicalIF":4.0,"publicationDate":"2026-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0