Journal of Hydrodynamics最新文献_第5页

Investigation on cavitating turbulent flow for the twisted NACA66 hydrofoil using a PANS model with helicity modification 使用带螺旋修正的 PANS 模型研究扭曲 NACA66 水翼的空化湍流

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-05-17 DOI: 10.1007/s42241-024-0020-z

Chen Geng, Zhao-hui Qian, Ke-xin Zheng, Wei-xiang Ye, Xian-wu Luo

{"title":"Investigation on cavitating turbulent flow for the twisted NACA66 hydrofoil using a PANS model with helicity modification","authors":"Chen Geng, Zhao-hui Qian, Ke-xin Zheng, Wei-xiang Ye, Xian-wu Luo","doi":"10.1007/s42241-024-0020-z","DOIUrl":"10.1007/s42241-024-0020-z","url":null,"abstract":"<div><p>In the present paper, the unsteady cavitating turbulent flow over the twisted NACA66 hydrofoil is investigated based on an modified shear stress transfer <i>k - ω</i> partially averaged Navier-Stokes (MSST PANS) model, i.e., new MSST PANS (NMSST PANS) model, where the production term of kinetic energy in the turbulence model is modified with helicity. Compared with the experimental data, cavitation evolution and its characteristic frequency are satisfactorily predicted by the proposed NMSST PANS model. It is revealed that the interaction among the main flow, the reentrant jets, and sheet cavitation causes the formation of the primary shedding cavity near the mid-span and the secondary shedding cavity at each side of the twisted hydrofoil, and further induces the remarkable pressure gradient around shedding cavities. Along with the development of the primary and the secondary shedding cavities, the great pressure gradient associated with large cavity volume variation promotes the vortical flow generation and the spatial deformation of vortex structure during cavitation evolution, and results in the primary and the secondary U-type vortices. Further, dynamic mode decomposition (DMD) analysis is utilized to confirm the interaction among the main flow, the main reentrant jet and two side reentrant jets, and cavitation. These results indicate that the proposed NMSST PANS model is suitable to simulate the complicated cavitating turbulent flow for various engineering applications.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 2","pages":"219 - 231"},"PeriodicalIF":2.5,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062815","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 investigations of the interactions between bubble induced shock waves and particle based on OpenFOAM 基于 OpenFOAM 的气泡诱导冲击波与粒子之间相互作用的数值研究

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-05-10 DOI: 10.1007/s42241-024-0017-7

Jia-xin Yu, Jin-sen Hu, Yu-hang Liu, Yi-fan Liu, Dan Gao, Yu-ning Zhang

引用次数: 0

Numerical simulation of liquid sloshing in a spherical tank by MPS method 用 MPS 方法对球形储罐中的液体荡动进行数值模拟

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-05-10 DOI: 10.1007/s42241-024-0018-6

Cong-yi Huang, Ji-fei Wang, Wei-wen Zhao, De-cheng Wan

引用次数: 0

Features and formulae of sediment incipient motion in vegetated flow environment 植被流环境中沉积物初始运动的特征和公式

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-04-29 DOI: 10.1007/s42241-024-0016-8

Yu-xuan Xu, Wei-jie Wang, Shi-bao Zhang, Han-qing Zhao, Xue-kai Chen, Hai-ping Zhang

{"title":"Features and formulae of sediment incipient motion in vegetated flow environment","authors":"Yu-xuan Xu, Wei-jie Wang, Shi-bao Zhang, Han-qing Zhao, Xue-kai Chen, Hai-ping Zhang","doi":"10.1007/s42241-024-0016-8","DOIUrl":"10.1007/s42241-024-0016-8","url":null,"abstract":"<div><p>Aquatic vegetation is a vital component of natural river ecosystems, playing a crucial role in maintaining ecological balance, providing habitat and improving water quality. However, the presence of vegetation results in increased resistance in vegetated channels compared with non-vegetated channels, rendering traditional sediment movement predictions inadequate for the latter. Consequently, the concept of a vegetation influence factor, denoted by <i>C</i><sub><i>D</i></sub><i>ah</i>, has been proposed by previous researchers to represent the effect of vegetation on sediment movement in watercourses. In this study, we focus on exploring the vegetation resistance coefficient (<i>C</i><sub><i>D</i></sub>) among the vegetation influence factors, evaluating two different calculation methods for vegetation resistance coefficient, and presenting two expressions through genetic algorithm analysis to predict the incipient flow velocity of sediment in vegetated watercourses. The predicted values from the new formulae show excellent agreement with measured data, highlighting the high accuracy of the proposed methods in predicting the incipient flow velocity of sediment. Our results provide a solid theoretical basis for understanding the influence of aquatic vegetation on sediment particle movement.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 2","pages":"331 - 339"},"PeriodicalIF":2.5,"publicationDate":"2024-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140827288","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 blade tip clearance cavitation and turbulent kinetic energy characteristics of axial flow pump based on the partially-averaged Navier-Stokes model 基于部分平均纳维-斯托克斯模型的轴流泵叶尖间隙气蚀和湍流动能特性研究

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-04-18 DOI: 10.1007/s42241-024-0014-x

Xiao-qi Jia, Shuai-kang Zhang, Zu-chao Zhu

{"title":"Research on blade tip clearance cavitation and turbulent kinetic energy characteristics of axial flow pump based on the partially-averaged Navier-Stokes model","authors":"Xiao-qi Jia, Shuai-kang Zhang, Zu-chao Zhu","doi":"10.1007/s42241-024-0014-x","DOIUrl":"10.1007/s42241-024-0014-x","url":null,"abstract":"<div><p>To reveal the cavitation forms of tip leakage vortex (TLV) of the axial flow pump and the flow mechanism of the flow field, this research adopts the partially-averaged Navier-Stokes (PANS) model to simulate the cavitation values of an axial flow pump, followed by experimental validation. The experimental result shows that compared with the shear stress transport (SST) <i>k</i> - <i>ω</i> model, the PANS model significantly reduces the eddy viscosity of the flow field to make the vortex structure clearer and allow the turbulence scale to be more robustly analyzed. The cavitation area within the axial flow pump mainly comprises of TLV cavitation, clearance cavitation and tip leakage flows combined effect of triangular cloud cavitation formed. The formation and development of cavitation are accompanied by the formation and evolution of vortex, and variations in vortex structure also generate and promote the development of cavitation. In addition, an in-depth analysis of the relationship between the turbulent kinetic energy (TKE) transport equation and cavitation patterns was also conducted, finding that the regions with relatively high TKE are mainly distributed around gas/liquid boundaries with serious cavitation and evident gas-liquid change. This phenomenon is mainly attributed to the combined effect of the pressure action term, stress diffusion term and TKE production term.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 1","pages":"184 - 201"},"PeriodicalIF":2.5,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634892","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

High-precision parallel computing model of solute transport based on GPU acceleration 基于 GPU 加速的溶质迁移高精度并行计算模型

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-04-18 DOI: 10.1007/s42241-024-0015-9

Shang-hong Zhang, Rong-qi Zhang, Wen-da Li, Xi-yan Yang, Yang Zhou

{"title":"High-precision parallel computing model of solute transport based on GPU acceleration","authors":"Shang-hong Zhang, Rong-qi Zhang, Wen-da Li, Xi-yan Yang, Yang Zhou","doi":"10.1007/s42241-024-0015-9","DOIUrl":"10.1007/s42241-024-0015-9","url":null,"abstract":"<div><p>The scenario simulation analysis of water environmental emergencies is very important for risk prevention and control, and emergency response. To quickly and accurately simulate the transport and diffusion process of high-intensity pollutants during sudden environmental water pollution events, in this study, a high-precision pollution transport and diffusion model for unstructured grids based on Compute Unified Device Architecture (CUDA) is proposed. The finite volume method of a total variation diminishing limiter with the Kong proposed r-factor is used to reduce numerical diffusion and oscillation errors in the simulation of pollutants under sharp concentration conditions, and graphics processing unit acceleration technology is used to improve computational efficiency. The advection diffusion process of the model is verified numerically using two benchmark cases, and the efficiency of the model is evaluated using an engineering example. The results demonstrate that the model perform well in the simulation of material transport in the presence of sharp concentration. Additionally, it has high computational efficiency. The acceleration ratio is 46 times the single-thread acceleration effect of the original model. The efficiency of the accelerated model meet the requirements of an engineering application, and the rapid early warning and assessment of water pollution accidents is achieved.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 1","pages":"202 - 212"},"PeriodicalIF":2.5,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634895","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

Characteristics of turbulent flow in 3-D pools in the presence of submerged rigid vegetation in channel bed 河床中存在沉水刚性植被时三维水池中湍流的特征

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-04-11 DOI: 10.1007/s42241-024-0009-7

Kourosh Nosrati, Hossein Afzalimehr, Jueyi Sui, Hamid Reza Reisifar

{"title":"Characteristics of turbulent flow in 3-D pools in the presence of submerged rigid vegetation in channel bed","authors":"Kourosh Nosrati, Hossein Afzalimehr, Jueyi Sui, Hamid Reza Reisifar","doi":"10.1007/s42241-024-0009-7","DOIUrl":"10.1007/s42241-024-0009-7","url":null,"abstract":"<div><p>In this study, the interaction between 3-D bedforms and submerged rigid vegetation has been investigated. Various laboratory experiments were conducted to study the distribution of flow velocity, Reynolds shear stress, turbulent kinetic energy, and skewness coefficients for a constant density of vegetation. Results showed that the velocity profile in the pool section deviates from those in the upstream section of the pool. It has been found that the dip parameter varied between 0.6<i>H</i> and 0.9<i>H</i> depending on various factors including bed roughness, vegetation distribution, and pool entrance/exit slopes. However, scattered vegetation in the pool and differences in slopes created non-uniform flow conditions. Also, in the wake region behind each vegetated element, flow velocity reduced significantly, and small-scale eddies are formed, causing increased perturbations. By decreasing the entrance slope and bed roughness, relatively uniform flow and weaker turbulence was resulted, but the random distribution of vegetated elements counteracted this balance and intensified turbulence. With the decrease in the pool entrance slope, the contribution of sweep event decreased and the contribution of ejection event increased.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 1","pages":"158 - 169"},"PeriodicalIF":2.5,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580709","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

Vortex identification based on the Liutex method and its effect on fish passage upstream 基于柳特克斯法的涡流识别及其对上游鱼类通道的影响

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-04-11 DOI: 10.1007/s42241-024-0010-1

Chun-ying Shen, Rui-guo Yang, Xiao-tao Shi, Ming-ming Wang, Shi-hua He

{"title":"Vortex identification based on the Liutex method and its effect on fish passage upstream","authors":"Chun-ying Shen, Rui-guo Yang, Xiao-tao Shi, Ming-ming Wang, Shi-hua He","doi":"10.1007/s42241-024-0010-1","DOIUrl":"10.1007/s42241-024-0010-1","url":null,"abstract":"<div><p>Fishway research is important for mitigating the fragmentation of river habitats caused by hydraulic projects. The vertical slit fishway is a broadly used fishway type because of its high efficiency and adaptability to water levels. However, the resulting vortex current disrupts the fish passage hence directly affecting fish migration. This study aims to accurately capture the vortex structure in the fishway and analyze the effect of vortex elements (vortex structure, vortex intensity, etc.) on fish. We conducted an analysis of the 3-D current flow field in the fishway through the utilization of an experimental model and the large eddy simulation (LES) method. Moreover, we captured the vortex information in the fishway at different flow rates using the Liutex vortex identification method and investigated the effect of the vortex on fish migration. The results revealed that the structures inside the fishway pool occupy most of the room, however, the areas with higher vortex strength were primarily located in the vortex near the vertical seam and the mainstream, the vortex strength inside the fishway gradually increases with increasing flow, suppressing fish migration. Fish experienced significantly increased resistance when encountering strong vortices. This suggests that the vortex may act as a physical barrier to fish migration. These findings highlight the potential negative effects of vortex on fish movement and reiterate the importance of understanding vortex dynamics for aquatic environmental management. As an effective tool for identifying vortices in fluid flow, the Liutex method demonstrates features of vortex within the fishway, thereby providing important insights into the interaction between fluid dynamics and aquatic organisms.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 1","pages":"130 - 141"},"PeriodicalIF":2.5,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580791","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 and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors 转子尖耙对泵喷推进器激振力影响的实验和数值研究

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-04-11 DOI: 10.1007/s42241-024-0011-0

Xue-qin Ji, Xiao-song Zhang, Chen-jun Yang, Xiao-qian Dong

{"title":"Experimental and numerical investigation of the impacts of rotor tip-rake on excitation forces of pump-jet propulsors","authors":"Xue-qin Ji, Xiao-song Zhang, Chen-jun Yang, Xiao-qian Dong","doi":"10.1007/s42241-024-0011-0","DOIUrl":"10.1007/s42241-024-0011-0","url":null,"abstract":"<div><p>The tip-clearance flow in a pump-jet propulsor exerts great impacts on the fluctuating pressures and resultant unsteady forces, which are important sources of structural vibrations and radiated noise underwater. The blade geometry close to the tip is an important factor determining the vortex strength in the tip-clearance flow. In the open-water condition, the effects of raking the rotor tips on the duct-surface fluctuating pressures and the resultant unsteady forces acting on different components of the propulsor are investigated via physical model experiments and the numerical solution of Reynolds-averaged Navier-Stokes (RANS) equations coupled with the SST <i>k</i> - <i>ω</i> turbulence model. The measured and simulated results of hydrodynamic pressures are consistent to each other, and the simulated flows help better understand why the fluctuating pressures change with the tip geometry. The strong fluctuations of duct-surface pressures are caused by intensive tip separation vortices. The duct-surface pressure fluctuations are effectively reduced by using the rake distribution near the tip towards blade back side and, for the combination of the five-bladed rotor and the seven-bladed stator, the resultant unsteady horizontal (and vertical) forces acting on the duct and stator are also reduced; while increasing rake leads to negative effect on pressure fluctuations and unsteady horizontal (and vertical) forces acting on all the components of the propulsor.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 1","pages":"142 - 157"},"PeriodicalIF":2.5,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140580707","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 two-layer high-level Green-Naghdi model in a general form 关于一般形式的两层高层格林-纳格迪模型

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-04-11 DOI: 10.1007/s42241-024-0012-z

Bin-bin Zhao, Tian-yu Zhang, Zhan Wang, Wen-yang Duan, Alexander Chesnokov, Natalia Shmakova

{"title":"On the two-layer high-level Green-Naghdi model in a general form","authors":"Bin-bin Zhao, Tian-yu Zhang, Zhan Wang, Wen-yang Duan, Alexander Chesnokov, Natalia Shmakova","doi":"10.1007/s42241-024-0012-z","DOIUrl":"10.1007/s42241-024-0012-z","url":null,"abstract":"<div><p>The traditional high-level Green-Naghdi (HLGN) model, which uses the polynomial as the shape function to approximate the variation of the horizontal- and vertical-velocity components along the vertical direction for each-fluid layer, can accurately describe the large-amplitude internal waves in a two-layer system for the shallow configuration (<i>h</i><sub>2</sub> / <i>λ</i> <b>≪</b> 1, <i>h</i><sub>1</sub> / <i>λ</i> <b>≪</b> 1). However, for the cases of the deep configuration (<i>h</i><sub>2</sub> / <i>λ</i> <b>≪</b> 1, <i>h</i><sub>1</sub> / <i>λ = O</i>(1)), higher-order polynomial is needed to approximate the variation of the velocity components along the vertical direction for the lower-fluid layer. This, however, introduces additional unknowns, leading to a significant increase in computational time. This paper, for the first time, derives a general form of the HLGN model for a two-layer fluid system, where the general form of the shape function is used during the derivation. After obtaining the general form of the two-layer HLGN equations, corresponding solutions can be obtained by determining the reasonable shape function. Large-amplitude internal solitary waves in a deep configuration are studied by use of two different HLGN models. Comparison of the two HLGN models shows that the polynomial as the shape function for the upper-fluid layer and the production of exponential and polynomial as the shape function for the lower-fluid layer is a good choice. By comparing with Euler’s solutions and the laboratory measurements, the accuracy of the two-layer HLGN model is verified.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 1","pages":"78 - 86"},"PeriodicalIF":2.5,"publicationDate":"2024-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140581166","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