Journal of Hydrodynamics最新文献_第2页

Numerical study of the control of flow field and propeller cavitation pressure fluctuation behind the ship 船后流场及螺旋桨空化压力波动控制的数值研究

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-29 DOI: 10.1007/s42241-025-0035-0

Chao-sheng Zheng, Kang Liu, Deng-cheng Liu, Fang-wen Hong, Zhi-rong Zhang

引用次数: 0

Cavitation model of non-equilibrium between phase transition and hydrodynamics 相变与流体力学非平衡空化模型

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-29 DOI: 10.1007/s42241-025-0033-2

Fang-wen Hong, Shu-cheng Zhai, Chao-sheng Zheng, Deng-cheng Liu

{"title":"Cavitation model of non-equilibrium between phase transition and hydrodynamics","authors":"Fang-wen Hong, Shu-cheng Zhai, Chao-sheng Zheng, Deng-cheng Liu","doi":"10.1007/s42241-025-0033-2","DOIUrl":"10.1007/s42241-025-0033-2","url":null,"abstract":"<div><p>During strong unsteady flow processes such as cavitation initiation and collapse, the volume changes generated by the materials transformation of cavitation phase transition seriously lag behind the volume evolution formed by the flow process. The phase transition and hydrodynamics are in a non-equilibrium state. A cavitation model that can describe such non-equilibrium phenomena is needed in numerical simulations of cavitation flow. The paper starts from the molecular dynamics’ principle of phase change of matter, and based on the Maxwell velocity distribution form of molecular thermal motion, elaborates on the formation process of Hertz Knudsen formula for material exchange at the interface between liquid and vapor. On this basis, using the evolution equation of gas nucleus number density in water and the compressible state equation of vapor, a non-equilibrium cavitation model for phase transition and hydrodynamics is established. The simulation results of a vapor bubble collapse process in the non-equilibrium cavitation model show different behavior from the simulation results of the equilibrium cavitation model. The simulation results of the equilibrium cavitation model show that the vapor bubble collapses once and completely disappear, while the simulation results of the non-equilibrium cavitation model show multiple collapses and rebound, which is agreement with the experimental results of the vapor bubble collapse.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"37 3","pages":"489 - 496"},"PeriodicalIF":3.5,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248228","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

Simulating stochastic transport: An efficient random displacement model for multi-domain applications in ecology, hydraulics, and environmental systems 模拟随机输运：在生态、水力学和环境系统中多领域应用的高效随机位移模型

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-29 DOI: 10.1007/s42241-025-0032-3

Liu Yang, Zhong-hua Yang, Meng-yang Liu, Yi-dan Ai, Wen-xin Huai

{"title":"Simulating stochastic transport: An efficient random displacement model for multi-domain applications in ecology, hydraulics, and environmental systems","authors":"Liu Yang, Zhong-hua Yang, Meng-yang Liu, Yi-dan Ai, Wen-xin Huai","doi":"10.1007/s42241-025-0032-3","DOIUrl":"10.1007/s42241-025-0032-3","url":null,"abstract":"<div><p>The random displacement model (RDM) can efficiently simulate particle transport processes, which are difficult to observe, incorporating stochastic and hydraulic parameters. In recent decades, it has been used in many domains, including environments, hydraulics, and ecology. However, the results exhibit significant uncertainties arising from the model resolution, hydrodynamic accuracy, intrinsic characteristics of particles, and boundary conditions. The objective of the present study is to comprehensively interpret the RDM from theory to application, and emphasize essential considerations for users in different domains. The study also provides several application strategies for the model, based on several practical RDM cases. Determining the turbulent diffusivity and velocity profiles in complex flow field is a critical step to precisely simulate particle movement. Furthermore, the physical and biological properties of passive and active particles require fundamental investigation to extend the applicability of the model. Existing studies suggest that flexibly coupling the RDM with other numerical models customized to the characteristics of distinct problems will substantially expand the utility of the RDM and could yield innovative approaches for addressing previously intractable issues.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"37 3","pages":"421 - 436"},"PeriodicalIF":3.5,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248284","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

The mechanisms of air-driven growth of tip vortex cavity 叶顶涡空腔气动生长机理研究

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-29 DOI: 10.1007/s42241-025-0034-1

Xin-zhen Qin, Xue-ming Shao, Jian Deng

{"title":"The mechanisms of air-driven growth of tip vortex cavity","authors":"Xin-zhen Qin, Xue-ming Shao, Jian Deng","doi":"10.1007/s42241-025-0034-1","DOIUrl":"10.1007/s42241-025-0034-1","url":null,"abstract":"<div><p>Tip vortex cavitation (TVC) is a critical phenomenon in propeller and turbine machinery. While much of the existing research on TVC has focused on its inception, the mechanisms driving its continuous growth remain under-explored. In this study, we propose a comprehensive theoretical model that integrates both gas diffusion and free nuclei entrainment to better understand the slow growth of tip vortex cavity. The efficacy of this model is validated by comparing its predicted temporal evolution of cavity size with experimental data, under both nuclei-depleted and large nuclei-injection conditions. Additionally, the model is used to further examine the individual effects of nuclei content and size on tip vortex cavity growth. Results reveal that, in sub-saturated nuclei flow, two critical equilibrium values for cavity size are identified: one determined by the balance of dissolved gases inside the cavity and the surrounding fluid, and the other by the balance between dissolved gases inside the cavity and the surrounding gas nuclei. The cavity stability size gradually shifts from the first to the second critical value as the gas nuclei content increases. However, since the model does not consider the destabilization mechanism of the cavity, the cavity may destabilize before reaching the second critical value. Meanwhile, the cavity growth rate increases significantly with increasing gas nuclei size. This work not only provides a comprehensive explanation for the experimental observations, but also provides new insights into the hysteresis phenomenon observed in TVC.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"37 3","pages":"468 - 477"},"PeriodicalIF":3.5,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248337","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

Multiscale modeling of propeller cavitation flows in open water 开阔水域螺旋桨空化流动的多尺度模拟

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-29 DOI: 10.1007/s42241-025-0036-z

Ben Zhang, Chao-sheng Zheng, Xue-ming Shao, Jian Deng

{"title":"Multiscale modeling of propeller cavitation flows in open water","authors":"Ben Zhang, Chao-sheng Zheng, Xue-ming Shao, Jian Deng","doi":"10.1007/s42241-025-0036-z","DOIUrl":"10.1007/s42241-025-0036-z","url":null,"abstract":"<div><p>Cavitation performance is a critical hydrodynamic characteristic of ship propellers, and it has been a key focus in naval architecture research. This study introduces a hybrid multiscale Euler-Lagrange model for unsteady propeller cavitation simulations, incorporating the effects of water quality. A uniform mixture model is used for macroscopic cavity simulation. Under the Lagrangian framework, the dynamics and motion of nuclei and bubbles are resolved. Comparisons with experimental data and numerical results from traditional cavitation models show that the multiscale model accurately predicts cavitation on propeller blades and reproduces certain tip vortex cavitation phenomena. The model’s applicability is validated across different advance coefficients and cavitation numbers, further confirming its robustness in simulating propeller cavitation. Additionally, the study explores the distribution of nuclei and emphasizes the advantages of the multiscale approach in capturing tip vortex cavitation. This research provides a strong foundation for investigating the comprehensive effects of water quality on propeller cavitation and offers promising avenues for future studies in this area.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"37 3","pages":"478 - 488"},"PeriodicalIF":3.5,"publicationDate":"2025-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248338","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

Towards improved turbulence modeling: Statistical analysis of Liutex and Liutex-based subgrid models for large eddy simulation 改进湍流模拟：大涡模拟中Liutex和基于Liutex的子网格模型的统计分析

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-04 DOI: 10.1007/s42241-025-0024-3

Xin Dong, Zhang-dan Yu, Hai-dong Yu, Yi-qian Wang, Yue-hong Qian

{"title":"Towards improved turbulence modeling: Statistical analysis of Liutex and Liutex-based subgrid models for large eddy simulation","authors":"Xin Dong, Zhang-dan Yu, Hai-dong Yu, Yi-qian Wang, Yue-hong Qian","doi":"10.1007/s42241-025-0024-3","DOIUrl":"10.1007/s42241-025-0024-3","url":null,"abstract":"<div><p>Vortices play a fundamental role in fluid dynamics, but mathematically defining them remains elusive. While many vortex identification methods are scalar-valued, vortices are inherently rotational, vector-based phenomena. Liutex, as a vector quantity, addresses these limitations by accurately capturing the local rotational characteristics of fluid elements while remaining independent of shear influences. This unique property makes Liutex particularly well-suited for vortex identification and the quantitative analysis of turbulent flows. This paper explores the statistical analysis of Liutex in various turbulence regimes and proposes an objective Liutex-based vortex identification method. The objective method is rooted in the statistical properties of Liutex. Furthermore, the paper investigates the performance of Liutex-based subgrid models in large eddy simulation (LES). The effectiveness of these models is evaluated by comparing their performance in different flow conditions, such as decaying homogeneous isotropic turbulence and turbulent channel flows, against conventional models. Results demonstrate that the inclusion of Liutex significantly enhances the ability of subgrid models to accurately capture flow structures. Importantly, the new model maintains the same form regardless of whether strong or weak shear is present, ensuring robustness and consistency in both vortex identification and turbulence modeling. These findings highlight the significant potential of Liutex to improve turbulence modeling in both theoretical and practical contexts, with ongoing research aimed at further refining its theoretical foundations and expanding its application in more complex flow scenarios.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"37 2","pages":"256 - 265"},"PeriodicalIF":3.5,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843229","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

Research on the mechanical equilibrium equation of ice jam 冰塞力学平衡方程的研究

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-04 DOI: 10.1007/s42241-025-0028-z

Yin-qin Tang, Jing-wei Feng, Jun Wang, Jueyi Sui, Guowei Li

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Vortex dynamics and wall shear stress from bubble collapse near a particle and a wall 粒子和壁面附近气泡崩塌时的涡旋动力学和壁面剪应力

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-04 DOI: 10.1007/s42241-025-0025-2

Xin Wu, Jin-sen Hu, Jia-lu Wang, Zhi-feng Wang, Yu-ning Zhang

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Unsteady flow characteristics of backflow vortices in an axial-flow pump at low flow rates 低流量轴流泵内回流旋涡的非定常流动特性

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-04 DOI: 10.1007/s42241-025-0029-y

Shu-ting Cai, Ren-fang Huang, Zhao-hui Qian, Xian-wu Luo, Yi-wei Wang

{"title":"Unsteady flow characteristics of backflow vortices in an axial-flow pump at low flow rates","authors":"Shu-ting Cai, Ren-fang Huang, Zhao-hui Qian, Xian-wu Luo, Yi-wei Wang","doi":"10.1007/s42241-025-0029-y","DOIUrl":"10.1007/s42241-025-0029-y","url":null,"abstract":"<div><p>Axial flow pumps are widely used in water conservancy, petrochemical and agricultural industries. Efficient operation is crucial for energy conservation and emission reduction. Improving efficiency under severe conditions requires studying the internal flow of axial-flow pumps, particularly at low flow rates where backflow vortices form near the impeller inlet. This study investigates the unsteady flow characteristics of backflow vortices at different flow rates in an axial-flow pump. Results show that backflow vortices form when the flow rate decreases to 0.59<i>Q</i><sub>d</sub>. As the flow rate further declines, the backflow vortex progresses upstream, contracts, and rebounds. The flow rate range is divided into three stages: Stage I with no backflow vortex, stage II with initial vortex development extending upstream and relatively fragmented, and stage III with vortex contraction and rebound forming a more coherent structure. Besides, backflow vortices induce significant pressure fluctuations and velocity oscillations with the primary frequency being 0.5 <i>f</i><sub><i>b</i></sub>. They exhibit a three-dimensional spiral motion involving changes in axial length, self-rotation, and revolution around the pump axis, with an angular velocity of approximately half the impeller’s rotational speed. This work enhances insights into backflow vortex behaviors, which is essential for optimizing pump design and improving operational stability in challenging environments.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"37 2","pages":"359 - 376"},"PeriodicalIF":3.5,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843226","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 evaluation of human sliding instability risk under overtopping flow on a hydrophilic revetment 亲水护岸上溢流条件下人体滑动失稳风险的数值评价

IF 3.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2025-08-04 DOI: 10.1007/s42241-025-0030-5

Tang-zhi Liu, Hong-jie Wen

{"title":"Numerical evaluation of human sliding instability risk under overtopping flow on a hydrophilic revetment","authors":"Tang-zhi Liu, Hong-jie Wen","doi":"10.1007/s42241-025-0030-5","DOIUrl":"10.1007/s42241-025-0030-5","url":null,"abstract":"<div><p>Hydrophilic revetments serve various pedestrian needs, including walking and wading, but they also confront serious wave overtopping challenges. Pedestrians on these revetments may face instability, falls, or even accidents leading to slipping into the sea due to overtopping flow. This study numerically investigates the hydrodynamic processes of overtopping flow impacting human bodies on a vertical hydrophilic revetment. A human sliding instability model tailored to wave overtopping conditions is developed, analyzing the human instability risks under different orientations (frontal, lateral and oblique), movement postures (stationary, slow walking and brisk walking), and somatotype (children, adults 1 and 2). The findings indicate that pedestrians facing overtopping flow at a 45° angle experience the maximum impact force. While brisk-walking pedestrians generally encounter lower impact forces, the effect of concomitant inertial force doubles their instability risk compared to when stationary. Notably, the instability risk for children is approximately 5.7 times that for adult one when facing wave overtopping. This research can provide a scientific foundation for designing and managing hydrophilic spaces in coastal areas.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"37 2","pages":"377 - 387"},"PeriodicalIF":3.5,"publicationDate":"2025-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144843227","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