水动力学研究与进展:英文版最新文献_第9页

Vortex shedding in the flow around two side-by-side circular cylinders of different diameters 在两个相邻的不同直径的圆柱体周围流动的旋涡脱落

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-06-01 DOI: 10.1016/S1001-6058(16)60758-8

Xiang Qiu (邱翔) , Zhen-xiao Bi (毕贞晓) , Jian-ping Luo (罗剑平) , Yu-lu Liu (刘宇陆)

{"title":"Vortex shedding in the flow around two side-by-side circular cylinders of different diameters","authors":"Xiang Qiu (邱翔) , Zhen-xiao Bi (毕贞晓) , Jian-ping Luo (罗剑平) , Yu-lu Liu (刘宇陆)","doi":"10.1016/S1001-6058(16)60758-8","DOIUrl":"10.1016/S1001-6058(16)60758-8","url":null,"abstract":"<div><p>In this paper, the 3-D turbulent flow around two side-by-side circular cylinders of different diameters, at sub-critical Reynolds number (<em>Re</em> = 3900), is numerically simulated by the large eddy simulation (LES). The spacing ratios (<em>T/D</em>) between the two cylinders are considered in four cases (<em>T/D</em> = 1.2, 1.5, 1.8 and 2.7) to study the vortex shedding and turbulent properties in the flow field. The main results are focused on the drag and lift coefficients, the vortex shedding frequency, the coherent structure, and the scale properties. It is shown that when <em>T/D</em> is equal to 1.2, the vortex shedding of the main cylinder is strongly suppressed by the small cylinder, the drag and lift coefficients of the main cylinder are smaller than those in other three cases. While <em>T/D</em> is equal to 1.5, the vortex shedding of the main cylinder can be improved, the drag and lift coefficients of the main cylinder are larger than those in other three cases. The empirical mode decomposition (EMD) method is applied to decompose the velocity signals traced by the LES. It is shown that there is a linear relationship between the mean period and the mode in the semi-log coordinates. The vortex shedding period of the main cylinder is consistent with the period of the restructured coherent structures quantitatively.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 3","pages":"Pages 470-478"},"PeriodicalIF":0.0,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60758-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4035221","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: 8

Shock waves and water wing in slit-type energy dissipaters 缝式消能器中的激波与水翼

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-06-01 DOI: 10.1016/S1001-6058(16)60762-X

Guo-bing Huang (黄国兵), Han Hu (胡晗), Cai-huan Wang (王才欢), Lan Du (杜兰)

引用次数: 7

Numerical modelling of supercritical flow in circular conduit bends using SPH method 用SPH方法模拟圆形管道弯道内超临界流动

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-04-01 DOI: 10.1016/S1001-6058(16)60744-8

Nikola M. Rosić , Milena B. Kolarević , Ljubodrag M. Savić , Dejana M. Đorđević , Radomir S. Kapor

引用次数: 2

The best hydraulic section of horizontal-bottomed parabolic channel section 最佳水力断面为水平底抛物线沟道断面

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-04-01 DOI: 10.1016/S1001-6058(16)60740-0

Yan-cheng Han (韩延成) , Xue-ping Gao (高学平) , Zheng-he Xu (徐征和)

{"title":"The best hydraulic section of horizontal-bottomed parabolic channel section","authors":"Yan-cheng Han (韩延成) , Xue-ping Gao (高学平) , Zheng-he Xu (徐征和)","doi":"10.1016/S1001-6058(16)60740-0","DOIUrl":"10.1016/S1001-6058(16)60740-0","url":null,"abstract":"<div><p>The best hydraulic channel section makes the maximum flow capacity for the same flow cross-area, and the minimum cross-area and wetted perimeter for the same discharge. The construction cost can be reduced nearly to the minimum at the same time. The horizontal bottom parabolic section (HBP section) is a composite section. It is important for design to find the best combination form of the horizontal bottom and the parabolic sides. This paper studies the best hydraulic section and its hydraulic characteristics. The explicit formulae are proposed to determine the dimensions and the best combination form of the horizontal bottom and the parabolic sides. These explicit formulae and the parameters make it easy to design the channel. It is shown that the ratios of the surface width to the depth and the bottom width to the depth are constant for the best hydraulic section. The comparisons with the classic parabolic, rectangular, trapezoid, triangular, semi-cubic and horizontal-bottomed semi-cubic sections show that the HBP section has the largest flow capacity and the shortest wetted perimeter for the same flow area, and has the smallest flow area for the same discharge. It is indicated that the parabolic side parts of the best hydraulic HBP section are different from those of the classic section. The results of the best hydraulic section of the classic parabolic channel cannot be applied directly to the HBC section.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 2","pages":"Pages 305-313"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60740-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4000597","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: 10

Numerical analysis of cavitation shedding flow around a three-dimensional hydrofoil using an improved filter-based model 三维水翼周围空化脱落流动的改进滤波模型数值分析

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-04-01 DOI: 10.1016/S1001-6058(16)60746-1

De-sheng Zhang (张德胜) , Wei-dong Shi (施卫东) , Guang-jian Zhang (张光建) , Jian Chen (陈健) , B.P.M. (Bart) van Esch

{"title":"Numerical analysis of cavitation shedding flow around a three-dimensional hydrofoil using an improved filter-based model","authors":"De-sheng Zhang (张德胜) , Wei-dong Shi (施卫东) , Guang-jian Zhang (张光建) , Jian Chen (陈健) , B.P.M. (Bart) van Esch","doi":"10.1016/S1001-6058(16)60746-1","DOIUrl":"10.1016/S1001-6058(16)60746-1","url":null,"abstract":"<div><p>The cavitation shedding flow around a 3-D Clark-Y hydrofoil is simulated by using an improved filter-based model (FBM) and a mass transfer cavitation model with the consideration of the maximum density ratio effect between the liquid and the vapor. The unsteady cloud cavity shedding features around the Clark-Y hydrofoil are accurately captured based on an improved FBM model and a suitable maximum density ratio. Numerical results show that the predicted cavitation patterns and evolutions compare well with the experimental visualizations, and the prediction errors of the time-averaged lift coefficient, drag coefficient and Strouhal number for the cavitation number, the angle of attack at a Reynolds number are only 3.29%, 2.36% and 9.58%, respectively. It is observed that the cavitation shedding flow patterns are closely associated with the vortex structures identified by the criterion method. The predicted cloud cavitation shedding flow shows clearly three typical stages: (1) Initiation of the attached sheet cavity, the growth toward the trailing edge. (2) The formation and development of the re-entrant jet flow. (3) Large scale cloud cavity sheds downstream. Numerical results also indicate that the non-uniform adverse pressure gradient is the main driving force of the re-entrant jet, which results in the U-shaped cavity and the 3-D bubbly structure during the cloud cavity shedding.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 2","pages":"Pages 361-375"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60746-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4000756","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: 13

Effects of finite-size heavy particles on the turbulent flows in a square duct 有限尺寸重颗粒对方形管道湍流流动的影响

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-04-01 DOI: 10.1016/S1001-6058(16)60737-0

Zhao-wu Lin (林昭武) , Xue-ming Shao (邵雪明) , Zhao-sheng Yu (余钊圣) , Lian-ping Wang (王连平)

{"title":"Effects of finite-size heavy particles on the turbulent flows in a square duct","authors":"Zhao-wu Lin (林昭武) , Xue-ming Shao (邵雪明) , Zhao-sheng Yu (余钊圣) , Lian-ping Wang (王连平)","doi":"10.1016/S1001-6058(16)60737-0","DOIUrl":"10.1016/S1001-6058(16)60737-0","url":null,"abstract":"<div><p>A parallel direct-forcing fictitious domain method is applied in fully-resolved numerical simulations of particle-laden turbulent flows in a square duct. The effects of finite-size heavy particles on the mean secondary flow, the mean streamwise velocity, the root-mean-square velocity fluctuation, and the particle concentration distribution are investigated at the friction Reynolds number of 150, the particle volume fraction of 2.36%, the particle diameter of 0.1 duct width, and the Shields number ranging from 1.0 to 0.2. Our results show that the particle sedimentation breaks the up-down symmetry of the mean secondary vortices, and results in a stronger secondary-flow circulation which transports the fluids downward in the bulk center region and upward along the side walls at a low Shields number. This circulation has a significant impact on the distribution of the mean streamwise velocity, whose maximum value occurs in the lower half duct, unlike in the plane channel case. The flow resistance is increased and the turbulence intensity is reduced, as the Shields number is decreased. The particles accumulate preferentially at the face center of the bottom wall, due to the effect of the mean secondary flow. It is observed that the collision model has an important effect on the results, but does not change the results qualitatively.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 2","pages":"Pages 272-282"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60737-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"3999964","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: 28

The effects of step inclination and air injection on the water flow in a stepped spillway: A numerical study 阶梯式溢洪道中台阶倾斜和空气注入对水流影响的数值研究

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-04-01 DOI: 10.1016/S1001-6058(16)60742-4

Khadidja Kherbache , Xavier Chesneau , Belkacem Zeghmati , Stéphane Abide , Saâdia Benmamar

引用次数: 2

Significant intervals of energy transforms in bubbles freely oscillating in liquids 在液体中自由振荡的气泡中能量转换的显著间隔

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-04-01 DOI: 10.1016/S1001-6058(16)60731-X

Karel Vokurka

引用次数: 4

Magnetohydrodynamic flows tuning in a conduit with multiple channels under a magnetic field applied perpendicular to the plane of flow 在垂直于流动平面的磁场作用下，多通道管道内的磁流体动力学流动调谐

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-04-01 DOI: 10.1016/S1001-6058(16)60743-6

Y. Luo , C.N. Kim , M.Q. Zhu

{"title":"Magnetohydrodynamic flows tuning in a conduit with multiple channels under a magnetic field applied perpendicular to the plane of flow","authors":"Y. Luo , C.N. Kim , M.Q. Zhu","doi":"10.1016/S1001-6058(16)60743-6","DOIUrl":"10.1016/S1001-6058(16)60743-6","url":null,"abstract":"<div><p>In this study, three-dimensional liquid-metal magnetohydrodynamic flows in a conduit with multiple channels under a uniform magnetic field are numerically investigated. The geometry of the conduit is of a four-parallel-channels system including one inflow channel and three outflow channels. The liquid-metal flows into the inflow channel, then turns through in the transition segment, finally flows into three different outflow channels. This kind of channel system can induce counter flow and co-flow, which is rarely investigated before though the conceptual designs of duct flow in the blanket have suggested this type of flow. A structured grid system is chosen after a series of mesh independence tests in the present study. The axial velocity in the side layer near the first partitioning wall, located between the inflow channel and the first outflow channel, is the highest with the lowest electric potential formed therein. The pressure almost linearly decreases in the main flow direction, except in the transition segment. Moreover, the pressure gradient in the first outflow channel is the largest among the three outflow channels. The interdependency of the current, fluid velocity, pressure, electric potential is examined in order to describe the electromagnetic characteristics of the liquid-metal flows.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 2","pages":"Pages 332-343"},"PeriodicalIF":0.0,"publicationDate":"2017-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60743-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"3999973","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: 4

Efficient suction control of unsteadiness of turbulent wing-plate junction flows 翼板交界湍流非定常的高效吸力控制

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-04-01 DOI: 10.1016/S1001-6058(16)60745-X

Jian-hua Liu (刘建华), Chang-you Song (宋长友)

引用次数: 1