Journal of Hydrodynamics最新文献_第3页

Determination of ice jam thickness—A new approach 冰塞厚度的测定--一种新方法

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-07-12 DOI: 10.1007/s42241-024-0037-3

Jun Wang, Lian-sheng Sang, Fei-hu Song, Tie-jie Cheng, Jueyi Sui

{"title":"Determination of ice jam thickness—A new approach","authors":"Jun Wang, Lian-sheng Sang, Fei-hu Song, Tie-jie Cheng, Jueyi Sui","doi":"10.1007/s42241-024-0037-3","DOIUrl":"10.1007/s42241-024-0037-3","url":null,"abstract":"<div>In winter, rivers in cold regions often experience flood disasters resulted from ice jams or ice dams. Investigations of the variation of ice jam thickness and water level during an ice jammed period are not only a practical need for ice prevention to avoid disaster and plan water resource, but also essential for the development of any mathematical model for predicting the evolution of ice jam. So far, some equations based on the energy equation have been proposed to describe the relationship between ice jam thickness and water level. However, in the derivation of these equations, the local head loss coefficient at the ice jam head and the riverbed slope factor were neglected. Obviously, those reported equations cannot be used to preciously describe the flow energy equation with ice jams and accurately calculate the ice jam thickness and water level. In the present study, a more comprehensive theoretical model for hydraulic calculation of ice jam thickness has been derived by considering important and essential factors including riverbed slope and local head loss coefficient at the ice jam head. Furthermore, based on the data collected from laboratory experiments of ice jam accumulation, the local head loss coefficient at the ice jam head has been calculated, and the empirical equation for calculating the local head loss coefficient has been established by considering flow Froude number and the ratio of ice discharge to flow discharge. The results of this study not only provide a new reference for calculating ice jam thickness and water level, but also present a theoretical basis for accurate CFD simulation of ice jams.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 3","pages":"570 - 581"},"PeriodicalIF":2.5,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141739838","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

Jetting of a near-wall cavitation bubble induced by another tandem bubble 另一个串联气泡诱发的近壁空化气泡喷射

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-07-12 DOI: 10.1007/s42241-024-0039-1

Hui Han, Jing-zhu Wang, Jian-lin Huang, Peng-bo Bai, Yong-gang Chen, Yi-wei Wang

{"title":"Jetting of a near-wall cavitation bubble induced by another tandem bubble","authors":"Hui Han, Jing-zhu Wang, Jian-lin Huang, Peng-bo Bai, Yong-gang Chen, Yi-wei Wang","doi":"10.1007/s42241-024-0039-1","DOIUrl":"10.1007/s42241-024-0039-1","url":null,"abstract":"<div>Double bubbles near a rigid wall surface collapse to produce a significant jet impact, with potential applications in surface cleaning and ultrasonic lithotripsy. However, the dynamic behaviors of near-wall bubbles remain unexplored. In this study, we investigate the jetting of a near-wall bubble induced by another tandem bubble. We define two dimensionless standoff distances, γ1, γ2, to represent the distances from the center of the near-wall bubble to the rigid wall and the center of controlling bubble to the center of the near-wall bubble, respectively. Our observations reveal three distinct jetting regimes for the near-wall bubble: transferred jetting, double jetting, and directed jetting. To further investigate the jetting mechanism, numerical simulations are conducted using the compressibleInterFoam solver in the open-source framework of OpenFOAM. A detailed analysis shows that the transferred jet flow is caused by the pinch-off resulting from the axial contraction velocity at the lower end of the near-wall bubble being greater than the vertical contraction velocity, leading to a maximum jet velocity of 682.58 m/s. In the case of double jetting, intense stretching between the controlling bubble and the wall leads to a pinch-off and a double jetting with a maximum velocity of 1 096.29 m/s. The directed jet flow is caused by the downward movement of the high-pressure region generated by the premature collapse of the controlling bubble, with the maximum jet velocity reaching 444.62 m/s.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 3","pages":"444 - 456"},"PeriodicalIF":2.5,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141653275","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 investigation on compressible flow around a cylinder in proximity to the heated wall 对靠近加热壁的气缸周围可压缩流动的数值研究

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-07-12 DOI: 10.1007/s42241-024-0038-2

Yu-lu Liu, Jun-wang Qu, Yi-zhou Tao, Yong-guang Lyu, Xiang Qiu

{"title":"Numerical investigation on compressible flow around a cylinder in proximity to the heated wall","authors":"Yu-lu Liu, Jun-wang Qu, Yi-zhou Tao, Yong-guang Lyu, Xiang Qiu","doi":"10.1007/s42241-024-0038-2","DOIUrl":"10.1007/s42241-024-0038-2","url":null,"abstract":"<div>In this study, direct numerical simulations were conducted to investigate the compressible flow around a circular cylinder near a heated wall at a Reynolds number (Re) of 500 and a Mach number (Ma) of 0.4. The heating ratio T* ranging from 1.0 to 1.6 represents the different situations of a heated wall, whereas the gap ratio ranges from 0.3 to 1.0. This study analyzed the impact of heating effect and wall proximity on flow characteristics and aerodynamic forces. The results indicated that the stability of the flow was enhanced as the gap ratio decreased or the heating ratio increased. Through the calculation of enstrophy, it was found that the strength of shedding vortices weakens with a decrease in gap ratio or an increase in heating ratio. Furthermore, the mean drag coefficient decreases as the heating ratio increases or the gap ratio decreases. In contrast, the mean lift coefficient initially decreases and then increases as the gap ratio decreases. Finally, the drag reduction mechanism was analyzed by examining the pressure distribution on the surface of the cylinder.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 3","pages":"519 - 533"},"PeriodicalIF":2.5,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141653731","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

Energy partition in laser-induced cavitation bubbles near the rigid wall with a gas-containing hole 激光诱导的空化气泡在刚性壁附近与含气孔的能量分区

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-07-05 DOI: 10.1007/s42241-024-0035-5

Dong-qiao He, Hai-gang Wen, Si-yuan Geng, Chen-xi Yang, Qiang Zhong, Zhi-feng Yao

引用次数: 0

Prediction of bedload transport inside vegetation canopies with natural morphology 具有自然形态的植被冠层内床面负荷迁移预测

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-07-05 DOI: 10.1007/s42241-024-0033-7

Li He, Yu-qi Shan, Chao Liu, Hui Cao, Xing-nian Liu, Yakun Guo

{"title":"Prediction of bedload transport inside vegetation canopies with natural morphology","authors":"Li He, Yu-qi Shan, Chao Liu, Hui Cao, Xing-nian Liu, Yakun Guo","doi":"10.1007/s42241-024-0033-7","DOIUrl":"10.1007/s42241-024-0033-7","url":null,"abstract":"<div>Due to vegetation drag and vegetation-generated turbulence, bedload transport in vegetated channels is more complicated than that in nonvegetated channels. It is challenging to obtain accurate predictions of bedload transport in vegetated channels. Previous studies generally used rigid circular cylinders to simulate vegetation, and the impact of plant morphology on bedload transport was typically ignored; these methods deviate from natural scenarios, resulting in prediction errors in transport rates of more than an order of magnitude. This study measured bedload transport rates inside P. australis, A. calamus and T. latifolia canopies and in arrays of rigid cylinders for comparison. The impact of plant morphology on bedload transport in vegetated channels was examined. Inside the canopies of natural morphology, the primary factor driving bedload transport is the near-bed turbulent kinetic energy (TKE), which consists of both bed-generated and vegetation-generated turbulence. A method was proposed to predict the near-bed TKE inside canopies with natural morphology. For the same solid volume fraction of plants, the transport rate inside canopies with a natural morphology is greater than or equal to that within an array of rigid cylinders, depending on the plant shape. This finding indicates that plant morphology has a significant impact on transport rates in vegetated regions and cannot be ignored, which is typical in practice. Four classic bedload transport equations (the Meyer-Peter-Müller, Einstein, Engelund and Dou equations), which are suitable for bare channels (no vegetation), were modified in terms of the near-bed TKE. The predicted near-bed TKE was inserted into these four equations to predict the transport rate in canopies with natural morphology. A comparison of the predictions indicated that the Meyer-Peter-Müller equation had the highest accuracy in predicting the transport rate in vegetated landscapes.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 3","pages":"556 - 569"},"PeriodicalIF":2.5,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141587928","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

Predicting submerged vegetation drag with a machine learning-based method 用基于机器学习的方法预测水下植被阻力

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-07-05 DOI: 10.1007/s42241-024-0034-6

Meng-yang Liu, Hong-wu Tang, Sai-yu Yuan, Jing Yan

{"title":"Predicting submerged vegetation drag with a machine learning-based method","authors":"Meng-yang Liu, Hong-wu Tang, Sai-yu Yuan, Jing Yan","doi":"10.1007/s42241-024-0034-6","DOIUrl":"10.1007/s42241-024-0034-6","url":null,"abstract":"<div>Accurate estimation of the drag forces generated by vegetation stems is crucial for the comprehensive assessment of the impact of aquatic vegetation on hydrodynamic processes in aquatic environments. The coupling relationship between vegetation layer flow velocity and vegetation drag makes precise prediction of submerged vegetation drag forces particularly challenging. The present study utilized published data on submerged vegetation drag force measurements and employed a genetic programming (GP) algorithm, a machine learning technique, to establish the connection between submerged vegetation drag forces and flow and vegetation parameters. When using the bulk velocity, U, as the reference velocity scale to define the drag coefficient, Cd, and stem Reynolds number, the GP runs revealed that the drag coefficient of submerged vegetation is related to submergence ratio (H*), aspect ratio (d*), blockage ratio (ψ*), and vegetation density (λ). The relation between vegetation stem drag forces and flow velocity is implicitly embedded in the definition of Cd. Comparisons with experimental drag force measurements indicate that using the bulk velocity as the reference velocity, as opposed to using the vegetation layer average velocity, Uv, eliminates the need for complex iterative processes to estimate Uv and avoids introducing additional errors associated with Uv estimation. This approach significantly enhances the model’s predictive capabilities and results in a simpler and more user-friendly formula expression.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 3","pages":"534 - 545"},"PeriodicalIF":2.5,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141587931","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

Effect of the yaw angle on turbulent flow structures around the submarine model 偏航角对潜艇模型周围湍流结构的影响

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-07-05 DOI: 10.1007/s42241-024-0036-4

Yi-jing Hu, Yi Qu, Qin Wu, Biao Huang

{"title":"Effect of the yaw angle on turbulent flow structures around the submarine model","authors":"Yi-jing Hu, Yi Qu, Qin Wu, Biao Huang","doi":"10.1007/s42241-024-0036-4","DOIUrl":"10.1007/s42241-024-0036-4","url":null,"abstract":"<div>The objective of this paper is to investigate the turbulent flow structures around the submarine model and evaluate the effect of the yaw angle on the turbulent flow characteristics. The large eddy simulation based on the boundary data immersion method is used to investigate. The computational domain consists of 1.2×108 uniformly distributed Cartesian orthogonal grid nodes to capture the basic flow characteristics around the model. The pressure coefficient, friction coefficient and wake velocity distribution are in good agreement with the experimental data. Three different types of vortex structures were mainly captured around the model, including horseshoe vortex, sail tip vortex and crossflow separation vortex. With the increase of the yaw angle, the asymmetry of the horseshoe vortex and the tip vortex gradually increases, and the vortex strength of the vortex leg on the windward of the horseshoe vortex and the vortex strength of the tip vortex also increase gradually. For the crossflow separation vortex, the flow separation zone gradually expands and migrates downstream with the increase of the yaw angle.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 3","pages":"421 - 434"},"PeriodicalIF":2.5,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141587927","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 analysis of coupled sloshing and motion of a cylindrical FPSO in regular waves 圆柱形浮式生产储油轮在规则波浪中的淤积和运动耦合数值分析

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-06-28 DOI: 10.1007/s42241-024-0032-8

Wei-wen Zhao, Xiao-long Yang, De-cheng Wan

引用次数: 0

Flow characteristics and bubble statistics during the fragmentation process of the ingested main cavity in plunging breaking waves 跌落式破浪中摄入的主腔破碎过程中的流动特性和气泡统计数据

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-06-28 DOI: 10.1007/s42241-024-0031-9

Wen-bin Zhang, Wei-wen Zhao, De-cheng Wan

{"title":"Flow characteristics and bubble statistics during the fragmentation process of the ingested main cavity in plunging breaking waves","authors":"Wen-bin Zhang, Wei-wen Zhao, De-cheng Wan","doi":"10.1007/s42241-024-0031-9","DOIUrl":"10.1007/s42241-024-0031-9","url":null,"abstract":"<div>Plunging breaking waves play an important role in the exchange of heat, momentum, and mass between the atmosphere and ocean. In this paper, a series of direct numerical simulations is conducted to investigate the fragmentation process of the ingested main cavity in plunging breaking waves. The two-phase Navier-Stokes equations are solved using the finite-volume method based on adaptive refinement meshes. The free surface is captured using a geometrical volume of fluid method. Both 2-D, 3-D simulations are conducted. Instantaneous flow fields at different stages of wave breaking are presented and quantitative analysis for bubbles is performed. The 2-D instantaneous vorticity field and local velocity field are visualized to discuss the general flow characteristics during the fragmentation process. Then a 2-D parametric study is conducted to investigate the differences in the flow characteristics during the fragmentation process under different wave parameters including initial wave steepness (ε), Bond number (Bo), and Reynolds number (Re). 3-D vortex structures are shown to further investigate the mechanisms behind the differences in the flow characteristics. The bubble size distributions under two different initial wave steepness are also discussed with their relationship to the fragmentation process of the ingested main cavity. This research offers a significant understanding of the distinct procedures and fundamental dynamics involved in wave breaking, enhancing our comprehension of this intricate event.</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 3","pages":"546 - 555"},"PeriodicalIF":2.5,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552687","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 wake-induced vibration interference between two staggered wave-cone cylinders at subcritical Reynolds number 亚临界雷诺数下两个交错波锥筒之间的尾流诱导振动干扰研究

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-06-14 DOI: 10.1007/s42241-024-0028-4

Lin Zou, Di-wei Liu, Jian Liu, Hong-cheng Zuo, Yin-huan Zheng, Hao Xia

{"title":"Investigation of wake-induced vibration interference between two staggered wave-cone cylinders at subcritical Reynolds number","authors":"Lin Zou, Di-wei Liu, Jian Liu, Hong-cheng Zuo, Yin-huan Zheng, Hao Xia","doi":"10.1007/s42241-024-0028-4","DOIUrl":"10.1007/s42241-024-0028-4","url":null,"abstract":"<div>The wake induced vibration (WIV) of a one- and two-degree-of-freedom (1DOF, 2DOF) downstream wave-cone cylinder (WCC) behind a stationary equal-size upstream wave-cone cylinder in the staggered arrangement is numerically investigated at subcritical Reynolds number of 3 900 by using shear stressed transfer (SST) k - ω turbulence model. The streamwise pitch ratios (P / Dm) vary from 4 to 6 with a fixed incident angle α = 8°. Experimental measurements were also performed for the validation of the present numerical models. It is found that the largest vibration amplitude in crossflow direction occurred at P / Dm = 4, Ur =8 with small difference of streamwise vibration at P / Dm = 4, 6. Different from single wavy-cone cylinder (SWCC), the downstream flexible one of a pair staggered WCCs got larger vibration amplitude during phase switching stage instead of in-phase stage. The upstream wake will suppress the triple frequency of main frequency in the power spectra density (PSD) functions of Cl but stimulate the double one of that. An intriguing vibration mechanism happened in all 2DOF cases where the trajectory of downstream WCC is a significant ellipse rather than a figure of 8. The transformation of phase switching and the variation of the main frequency of drag coefficient (Cd) can be explained by the vortex-shedding modes of downstream WCC</div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 2","pages":"378 - 393"},"PeriodicalIF":2.5,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141503483","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