Journal of Hydrodynamics最新文献_第5页

A vortex boundary identification method for two-dimensional compressible flows based on Liutex-Shear interaction 基于流-剪切相互作用的二维可压缩流涡旋边界识别方法

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-05-14 DOI: 10.1007/s42241-026-0035-8

Cheng Wang, Wen Xia, Yu-tong Zhu, Yi-qian Wang, Jia-lin Lou

引用次数: 0

Experimental investigation on impingement pressure characteristics of submerged circular impinging jets 水下圆形冲击射流冲击压力特性实验研究

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-05-12 DOI: 10.1007/s42241-026-0034-9

Kang Liu, Hao-ran Wang, Zhi-gang Wang, Yong-can Chen, Hui Xie, Zhao-wei Liu

{"title":"Experimental investigation on impingement pressure characteristics of submerged circular impinging jets","authors":"Kang Liu, Hao-ran Wang, Zhi-gang Wang, Yong-can Chen, Hui Xie, Zhao-wei Liu","doi":"10.1007/s42241-026-0034-9","DOIUrl":"10.1007/s42241-026-0034-9","url":null,"abstract":"<div><p>Understanding the impingement pressure characteristics of normal and oblique submerged circular impinging jets is crucial for the safe operation of hydraulic structures. This study experimentally investigates these characteristics across a broad range of impingement angles (20°–90°) and velocities (1.03 m/s–6.77 m/s), with the Reynolds numbers of 20 457–134 459. The time-averaged impingement pressure, instantaneous maximum pressure, and Root Mean Square (RMS) of pressure fluctuations are examined as key parameters. Results indicate that the corresponding dimensionless pressure coefficients for the impingement pressure characteristics are independent of the Reynolds number. A unified framework for the distribution of dimensionless pressure coefficients in the impingement region is established by extending the time-averaged impingement pressure distribution to both the instantaneous maximum pressure and the RMS of pressure fluctuations, and validating against experimental data. The effects of the impingement angle and distance on the distribution parameters are further analyzed. Under normal impingement, all three pressure characteristics exhibit self-similar distributions. As the impingement angle decreases, asymmetry between upstream and downstream distributions increases, leading to lower peak pressures and flatter profiles. The distribution parameters for all three pressure descriptors follow a power-law relationship, with the magnitude RMS > instantaneous maximum > time-averaged pressure, reflecting distinct attenuation behaviors of the mean and fluctuating flows. Notably, the stagnation point pressure is proportional to the normal component of the jet velocity, and the dimensionless distribution parameters remain consistent across varying impingement distances. These findings enhance the understanding of submerged impinging jet behavior and offer practical guidance for the hydraulic design and protection of engineering structures.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"253 - 264"},"PeriodicalIF":4.0,"publicationDate":"2026-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323006","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

Study of self-excited vibration in pipe-ball valve system of hydropower plant with bidirectional coupling method 水电站管道-球阀系统双向耦合自激振动研究

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-05-11 DOI: 10.1007/s42241-026-0033-x

Bing-han Liu, Quan-wei Liang, Min Song, Jia-yi Fan, Dang-xiong Wang, Xian-wu Luo

{"title":"Study of self-excited vibration in pipe-ball valve system of hydropower plant with bidirectional coupling method","authors":"Bing-han Liu, Quan-wei Liang, Min Song, Jia-yi Fan, Dang-xiong Wang, Xian-wu Luo","doi":"10.1007/s42241-026-0033-x","DOIUrl":"10.1007/s42241-026-0033-x","url":null,"abstract":"<div><p>Self-excited vibration in a pipe-ball valve system is a complicated dynamic phenomenon that poses severe risks for hydropower plants, including water leakage, penstock rupture, and structural damage. Although this vibration has been correctly attributed to service seal failure in the ball valve, its triggering mechanism remains unknown. This study proposes a novel bidirectional coupling numerical approach to capture the fluid-structure interactions at service seal interfaces. The computational framework employs a dynamic mesh technique to resolve the bidirectional coupling between the transient fluid pressure and seal motion, supplemented by a simplified method of characteristics for efficient simulation of upstream penstock flow. The results show that the pressure ratio of the inlet chamber as well as the friction condition, representing the failure extent of service seal, are the vital factors for triggering the self-excited vibration. Meanwhile, the phase difference between the water hammer wave and service seal displacement creates a self-sustaining oscillation that enables continuous energy transfer from the fluid to the service seal. This energy accumulation process amplifies the vibration amplitude until the system reaches dynamic equilibrium. The vibration of the service seal also induces periodic downstream flow disturbances through the high-velocity jets and vortex formation, with energy transfer dominated by the characteristic vibration frequency. Importantly, the study shows that increasing either the pressure ratio or the friction force effectively suppresses the self-excited vibration, thus providing theoretical foundation for predicting and preventing the self-excited vibration in pipe-ball valve systems, which is particularly important in pumped storage power stations with long penstocks and ball valves located upstream of the pump-turbine units.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"225 - 238"},"PeriodicalIF":4.0,"publicationDate":"2026-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323025","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

On the governing equations for the hydroacoustic waves in an inviscid fluid 无粘流体中水声波的控制方程

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-05-08 DOI: 10.1007/s42241-026-0032-y

Dong-qiang Lu, Xiang-yi Yan

{"title":"On the governing equations for the hydroacoustic waves in an inviscid fluid","authors":"Dong-qiang Lu, Xiang-yi Yan","doi":"10.1007/s42241-026-0032-y","DOIUrl":"10.1007/s42241-026-0032-y","url":null,"abstract":"<div><p>The studies on the hydroacoustic waves in an inviscid compressible fluid are of great interest among the scientific community due to its physical significance and engineering applications. A deep survey, as shown in this article, indicates that there are different governing equations for the waves and the flows under several mathematical approximations. Revealing the mathematical origins and the applicable conditions for these governing equations is the aim of the present work. In the framework of the potential theory for an inviscid compressible fluid with irrotational flows, we re-derive the nonlinear governing equations for a general case with the nonnegligible convective effects. Then a couple of special examples are demonstrated and some relevant researches are reviewed. In particular, we find the meaning of a highly concerned term <i>g</i>(<i>∂Φ/∂z</i>) is due to the combined effects of the vertical gravitational acceleration and the flow convection, where <i>g</i> and <i>Φ</i> are respectively the gravitational acceleration and the velocity potential. Finally the well-known wave equation is obtained for the propagation of small disturbances in an initially stationary homogeneous fluid, in a mathematically and physically rigorous way, without the frequently-used assumption that the hydrostatic pressure is constant, putting emphasis on Batchelor’s viewpoint (1967) that, when there is a free surface or interface for the fluid, the gradient of the hydrodynamic pressure should be employed for the equation of momentum without the gravitational force.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 2","pages":"265 - 272"},"PeriodicalIF":4.0,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323475","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

Driftwood blockage probability in Piano Key Weirs 钢琴键堰浮木堵塞概率

IF 4 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-04-30 DOI: 10.1007/s42241-026-0031-z

Ye-lin Zhang, Fei Ma, Li Yao, Jian-hua Wu

引用次数: 0

Assessment of free-running model tests for KRISO Container Ship maneuvering in calm water and waves and comparison with CFD KRISO集装箱船静水波机动自由运行模型试验评价及与CFD比较

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-04-27 DOI: 10.1007/s42241-026-0030-0

Deniz Ozturk, Yugo Sanada, Sungtek Park, Zhaoyuan Wang, Dong-Hwan Kim, Hamid Sadat-Hosseini, Frederick Stern, Claus D. Simonsen, Dong-Jin Kim, Evgeni Milanov, Frans Quadvlieg, Hironori Yasukawa, Toralf Hamstad, Wen-tao Wang, Yasuyuki Toda

{"title":"Assessment of free-running model tests for KRISO Container Ship maneuvering in calm water and waves and comparison with CFD","authors":"Deniz Ozturk, Yugo Sanada, Sungtek Park, Zhaoyuan Wang, Dong-Hwan Kim, Hamid Sadat-Hosseini, Frederick Stern, Claus D. Simonsen, Dong-Jin Kim, Evgeni Milanov, Frans Quadvlieg, Hironori Yasukawa, Toralf Hamstad, Wen-tao Wang, Yasuyuki Toda","doi":"10.1007/s42241-026-0030-0","DOIUrl":"10.1007/s42241-026-0030-0","url":null,"abstract":"<div><p>Free-running model tests for the KRISO Container Ship (KCS) maneuvering in calm water and waves at Froude numbers 0.157 and 0.260 are assessed for facility biases and scale effects via comparisons of the results from multiple facilities. CFDShip-Iowa results are compared with experiments to assess CFD accuracy. Key variables from propulsive performance, self-propulsion, turning circles, and zigzag maneuvers are analyzed for variability and accuracy, highlighting those with the greatest influence on overall performance. Correlation curves show good agreement in self-propulsion performance. Turning circles in calm water at both Froude numbers show greater variability in the primary variables on the starboard side compared to the port side, while the secondary variables exhibit less variability overall. In waves, the primary variable variability increases, and the secondary variable variability decreases compared to the calm water case. CFD-EFD comparisons in calm water show larger differences in primary variables during port side turns, and smaller differences during starboard turns. In waves, both turning directions show larger errors in primary variables. Roll-related variables contribute most to variability and differences. For zigzag maneuvering, increased variability is observed under port side heading conditions, partly due to the small rudder angle.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 1","pages":"135 - 153"},"PeriodicalIF":3.5,"publicationDate":"2026-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148061112","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 of the effects of roll motion on ship maneuvering using a system simulation method 用系统仿真方法研究横摇运动对船舶操纵的影响

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-04-21 DOI: 10.1007/s42241-026-0029-6

Long Jiang, Jian-xi Yao, Zu-yuan Liu

{"title":"Investigation of the effects of roll motion on ship maneuvering using a system simulation method","authors":"Long Jiang, Jian-xi Yao, Zu-yuan Liu","doi":"10.1007/s42241-026-0029-6","DOIUrl":"10.1007/s42241-026-0029-6","url":null,"abstract":"<div><p>One of the primary methods for studying ship maneuverability is the system-based prediction approach. For low-speed ships, maneuverability can generally be predicted using the three-degree-of-freedom (3DOF) model. However, for ships with significant roll motion during maneuvering, the four-degree-of-freedom (4DOF) model is required to accurately predict their behavior. Currently, there is limited research on the impact of including roll motion on the accuracy of these predictions. To compare the prediction accuracy of the 3DOF model and the 4DOF model that incorporates roll effects, this paper uses the KRISO Container Ship (KCS) as a case study, simulating both 3DOF and 4DOF turning and zig-zag maneuvers. The hydrodynamic derivatives used in these simulations were obtained through virtual captive model tests based on the Reynolds-Averaged Navier–Stokes (RANS) method in OpenFOAM, and the method was validated for grid independence. The simulation results from both the 3DOF and 4DOF models were compared with experimental data. The results demonstrate that the 4DOF maneuvering motion model for prediction is feasible and offers higher accuracy compared with the 3DOF model, thereby confirming that roll motion significantly affects the maneuverability prediction of the ship and cannot be ignored.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 1","pages":"180 - 200"},"PeriodicalIF":3.5,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148061005","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 novel right-angle-turning pool design for fishways 一种新颖的直角转弯鱼道池设计

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-04-20 DOI: 10.1007/s42241-026-0028-7

Di Zhang, Yu-zhi Li, Chen Zhang, Dongfang Liang, Liang Cheng, Ya-kun Liu

{"title":"A novel right-angle-turning pool design for fishways","authors":"Di Zhang, Yu-zhi Li, Chen Zhang, Dongfang Liang, Liang Cheng, Ya-kun Liu","doi":"10.1007/s42241-026-0028-7","DOIUrl":"10.1007/s42241-026-0028-7","url":null,"abstract":"<div><p>Turning pools contribute to creating a more compact fishway design, alleviating the topographic constraint and optimizing the entrance location. Up to now, the hydrodynamic optimization of turning pools has failed to receive adequate attention. By conducting 3-D numerical simulations, this study proposes and compares eleven 90°-turning pool configurations (i.e. Scheme-0-Scheme-10) for a bilateral-symmetric multi-slot fishway (i.e. BMSF-R11 in the literature). Numerical results indicate that Scheme-2, Scheme-8, Scheme-9, and Scheme-10 can eliminate the mainstream’s adherence to sidewalls and ensure that the mainstream always lies in the middle region of the 90° - turning pool, which are deemed as favourable flow regime for upstream-migrating fish. Moreover, by alternately arranging five short baffles, three guide walls and one flow-splitting pier, Scheme-8, Scheme-9 and Scheme-10 can effectively reduce the size of the recirculation region in the 90°-turning pool, which is beneficial to avoiding the previously observed delay and inhibition of fish-passing. In addition, among all the eleven layouts, Scheme-8 and Scheme-9 generate the overall lowest velocity magnitude and turbulent level, being conducive to the upstream migration of moderate-swimming and weak-swimming fishes. Meanwhile, Scheme-9 can provide sufficient resting areas for upstream-migrating fish, with 30%–50% of the volume having the velocity magnitude less than 0.3 m/s, but Scheme-8 fails to meet this requirement. Due to its relatively good flow regime and hydrodynamic performance, Scheme-9 is ultimately recommended for the BMSF-R11 90° - turning pool. Fish passage experiments with live fish will be performed in the future to examine the actual passage efficiency of Scheme-9.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 1","pages":"1 - 17"},"PeriodicalIF":3.5,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060632","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

Quadrant analysis of the flow characteristics in rigid-vegetation and sediment-bed environment 刚性植被与沉积层环境中水流特性的象限分析

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-04-16 DOI: 10.1007/s42241-026-0027-8

Wan-yun Xue, Xiu-feng Wu, Shi-qiang Wu, Wen Wang, Jiang-yu Dai, Wei Zha, Wei-le Zhang

{"title":"Quadrant analysis of the flow characteristics in rigid-vegetation and sediment-bed environment","authors":"Wan-yun Xue, Xiu-feng Wu, Shi-qiang Wu, Wen Wang, Jiang-yu Dai, Wei Zha, Wei-le Zhang","doi":"10.1007/s42241-026-0027-8","DOIUrl":"10.1007/s42241-026-0027-8","url":null,"abstract":"<div><p>Strong shear flows form through and above the vegetation layer in natural rivers, leading to local scour at the roots of vegetation. In this paper, turbulent characteristics of the flow above a sediment bed in a rigid vegetation environment are studied experimentally, and the quadrant analysis is undertaken to investigate turbulence characteristics and material transport mechanism of the vegetation above a sand bed. The results show that after the vegetation is placed on the sand bed, flow velocity above the vegetation increases while flow resistance also increases. In the near-bed area, the Reynolds stress under the presence of vegetation is greater than that without vegetation, so the bed is prone to erosion in the vegetation area. Under the rigid vegetation environment, the dominant flow patterns are different at different vertical positions. At the top of the vegetation (0.6 ≤ <i>z</i> / <i>h</i> ≤ 1.2), the flow is mainly characterized by “eject” and “sweep” events, which contribute significantly to the Reynolds stress. In the vegetation layer (0.1 ≤ <i>z</i> / <i>h</i> ≤ 0.4), the flow is dominated by the “outward” and “inward” events, with these two events showing clear dominance. Influenced by vegetation, the vertical transport of turbulent kinetic energy is altered. Near the top of the vegetation, turbulent kinetic energy is transported vertically from the vegetation top (<i>z</i> / <i>h</i> = 0.9) towards both the water surface and the sand bed. Inside the vegetation zone, affected by bed form, turbulent kinetic energy is transported vertically from the position near the bed (<i>z</i> / <i>h</i> = 0.2).</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 1","pages":"201 - 211"},"PeriodicalIF":3.5,"publicationDate":"2026-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060695","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

Visualization experimental study on the influence of inlet flow rate on internal flow in a multiphase pump 进口流量对多相泵内部流动影响的可视化实验研究

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2026-04-15 DOI: 10.1007/s42241-026-0026-9

Wei-zheng An, Zheng Tan, Bo Zhang, Wen-sheng Ma, Qiang Ma, Xun Wen, Jin-ya Zhang

{"title":"Visualization experimental study on the influence of inlet flow rate on internal flow in a multiphase pump","authors":"Wei-zheng An, Zheng Tan, Bo Zhang, Wen-sheng Ma, Qiang Ma, Xun Wen, Jin-ya Zhang","doi":"10.1007/s42241-026-0026-9","DOIUrl":"10.1007/s42241-026-0026-9","url":null,"abstract":"<div><p>Multiphase pumps serve as a kind of core equipment for oil and gas transportation in marginal oilfields. Their performance and operational stability are significantly influenced by the physical properties of the multiphase medium and the complex internal flow structures within the pumps. Through force analysis on bubbles, this study predicts their migration trajectories within the impeller passage. High-speed camera visualization experiments were performed to systematically examine the gas-liquid two-phase flow characteristics under various flow conditions. The results indicate that the flow rate considerably influences both bubble aggregation behavior and the structure of tip leakage flow. At the rated flow rate, bubbles migrate toward the trailing edge of the suction side under the influence of pressure gradients and accumulate. Under high flow conditions, bubble deflection is reduced, and overflow leakage dominated by high velocity is observed. At low flow rates, bubbles impinge on the pressure side and form gas pockets, while tip leakage is intensified with notable backflow. This study elucidates two distinct mechanisms driving tip leakage flow, namely pressure difference driven and velocity driven, and reveals that variations in inlet flow rate lead to flow separation and vortex evolution in the tip region.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"38 1","pages":"56 - 67"},"PeriodicalIF":3.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060862","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