水动力学研究与进展:英文版最新文献_第6页

A new three-dimensional finite-volume non-hydrostatic shock-capturing model for free surface flow 自由表面流动的三维有限体积非静压激波捕获模型

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60768-0

Francesco Gallerano, Giovanni Cannata, Francesco Lasaponara, Chiara Petrelli

引用次数: 15

Spatial relationship between energy dissipation and vortex tubes in channel flow 通道流动中能量耗散与涡管的空间关系

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60770-9

Lie-kai Cao (曹列凯) , Dan-xun Li (李丹勋) , Huai Chen (陈槐) , Chun-jing Liu (刘春晶)

引用次数: 6

ICHD' 2018 The 13th International Conference on Hydrodynamics ICHD'2018第13届国际流体动力学大会

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(17)30007-0

引用次数: 0

Numerical analysis of flow separation zone in a confluent meander bend channel 合流曲流河道中水流分离带的数值分析

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60783-7

Bin Sui (隋斌), She-hua Huang (黄社华)

{"title":"Numerical analysis of flow separation zone in a confluent meander bend channel","authors":"Bin Sui (隋斌), She-hua Huang (黄社华)","doi":"10.1016/S1001-6058(16)60783-7","DOIUrl":"10.1016/S1001-6058(16)60783-7","url":null,"abstract":"<div><p>The flow pattern in the confluent meander bend channel under the conditions of different discharge ratios and junction angles is numerically simulated by means of the large eddy simulation (LES), and the characteristics of the flow separation zone are analyzed. Numerical results are well validated by experimental data with a good agreement. Analysis of the vertical confinement shows that the turbulence within the separation zone can be characterized as quasi-2-D. Details of the separation zone characteristics are revealed as shown by mean velocity isolines. According to the analysis of numerical results, the length and the width of the separation zone generally increase with the increase of the discharge ratio and the junction angle. However, the width of the separation zone keeps substantially constant when the junction angle increases from to 60° to 90°. The dimensionless shape of the separation zone is nearly the same for three discharge ratios and three junction angles. The formulas of the relative width and the relative length of the separation zone are obtained by means of the polynomial fit method.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 4","pages":"Pages 716-723"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60783-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44242256","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: 22

Numerical investigation of Reynolds number and scaling effects in micro-channels flows 微通道流动中雷诺数及尺度效应的数值研究

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60777-1

S.A. Si Salah, E.G. Filali, S. Djellouli

{"title":"Numerical investigation of Reynolds number and scaling effects in micro-channels flows","authors":"S.A. Si Salah, E.G. Filali, S. Djellouli","doi":"10.1016/S1001-6058(16)60777-1","DOIUrl":"10.1016/S1001-6058(16)60777-1","url":null,"abstract":"<div><p>Compared with conventional channels, experiments of microchannel often exhibit some controversial findings and sometimes even opposite trends, most notably the effects of the Reynolds number and the scaled channel height on the Poiseuille number. The experimental method has still been constrained by two key facts, firstly the current ability to machine microstructures and secondly the limitation of measurement of parameters related to the Poiseuille number. As a consequence, numerical method was adopted in this study in order to analyze a flow in two-dimensional rectangular microchannels using water as working fluid. Results are obtained by the solution of the steady laminar incompressible Navier-Stokes equations using control volume finite element method (CVFEM) without pressure correction. The computation was made for channel height ranging from 50 μm to 4.58 μm and Reynolds number varying from 0.4 to 1 600. The effect of Reynolds number and channel heights on flow characteristics was investigated. The results showed that the Poiseuille numbers agree fairly well with the experimental measurements proving that there is no scale effect at small channel height. This scaling effect has been confirmed by two additional simulations being carried out at channel heights of 2.5 μm and 0.5 μm, respectively and the range of Reynolds number was extended from 0.01 up to 1 600. This study confirm that the conventional analysis approach can be employed with confidence for predicting flow behavior in microchannels when coupled with carefully matched entrance and boundary conditions in the dimensional range considered here.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 4","pages":"Pages 647-658"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60777-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4007729","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: 14

Verification and validation of URANS simulations of the turbulent cavitating flow around the hydrofoil 水翼周围湍流空化流的URANS模拟验证与验证

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60774-6

Yun Long (龙云) , Xin-ping Long (龙新平) , Bin Ji (季斌) , Wen-xin Huai (槐文信) , Zhong-dong Qian (钱忠东)

{"title":"Verification and validation of URANS simulations of the turbulent cavitating flow around the hydrofoil","authors":"Yun Long (龙云) , Xin-ping Long (龙新平) , Bin Ji (季斌) , Wen-xin Huai (槐文信) , Zhong-dong Qian (钱忠东)","doi":"10.1016/S1001-6058(16)60774-6","DOIUrl":"10.1016/S1001-6058(16)60774-6","url":null,"abstract":"<div><p>In this paper, we investigate the verification and validation (V&V) procedures for the URANS simulations of the turbulent cavitating flow around a Clark-Y hydrofoil. The main focus is on the feasibility of various Richardson extrapolation-based uncertainty estimators in the cavitating flow simulation. The unsteady cavitating flow is simulated by a density corrected model (DCM) coupled with the Zwart cavitation model. The estimated uncertainty is used to evaluate the applicability of various uncertainty estimation methods for the cavitating flow simulation. It is shown that the preferred uncertainty estimators include the modified Factor of Safety (FS1), the Factor of Safety (FS) and the Grid Convergence Index (GCI). The distribution of the area without achieving the validation at the <em>V<sub>v</sub></em> level shows a strong relationship with the cavitation. Further analysis indicates that the predicted velocity distributions, the transient cavitation patterns and the effects of the vortex stretching are highly influenced by the mesh resolution.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 4","pages":"Pages 610-620"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60774-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4007748","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: 97

Numerical prediction of effective wake field for a submarine based on a hybrid approach and an RBF interpolation 基于混合方法和RBF插值的潜艇有效尾流场数值预测

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60781-3

Zhi-qiang Rao (饶志强) , Chen-jun Yang (杨晨俊)

{"title":"Numerical prediction of effective wake field for a submarine based on a hybrid approach and an RBF interpolation","authors":"Zhi-qiang Rao (饶志强) , Chen-jun Yang (杨晨俊)","doi":"10.1016/S1001-6058(16)60781-3","DOIUrl":"10.1016/S1001-6058(16)60781-3","url":null,"abstract":"<div><p>A hybrid approach coupled with a surface panel method for the propeller and a Reynolds averaged Navier-Stokes (RANS) model for the hull with the propeller body forces are presented for predicting the self-propulsion performance and the effective wake field of underwater vehicles. To achieve a high accuracy and simplicity, a radial basis function (RBF) based approach is proposed for mapping the force field from the blade surface panels to the RANS model. The effective wake field is evaluated in two ways, i.e., by extrapolation from the flat planes upstream of the propeller disk, and by direct computation in a curved surface upstream of and parallel to the blade leading edges. The hull-propeller system of a real propeller geometry is further simulated with the sliding mesh model to numerically verify the hybrid approach. Numerical simulations are conducted for the fully appended SUBOFF submarine model. The high accuracy of the RBF-based interpolation scheme is confirmed, and the effective wake fraction predicted by the hybrid approach is found consistent with that obtained by the sliding mesh model. The effective wake fractions predicted by the two methods are, respectively, 4.6% and 3% larger than the nominal one.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 4","pages":"Pages 691-701"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60781-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4007736","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: 12

Cavitation erosion in bloods 血液中的空化侵蚀

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60784-9

Jian-hua Wu (吴建华) , Yu Wang (王宇) , Fei Ma (马飞) , Wen-juan Gou (缑文娟)

引用次数: 8

Mechanics of granular column collapse in fluid at varying slope angles 不同坡角下颗粒柱在流体中的崩塌力学

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60766-7

K. Kumar , J.-Y. Delenne , K. Soga

{"title":"Mechanics of granular column collapse in fluid at varying slope angles","authors":"K. Kumar , J.-Y. Delenne , K. Soga","doi":"10.1016/S1001-6058(16)60766-7","DOIUrl":"10.1016/S1001-6058(16)60766-7","url":null,"abstract":"<div><p>This paper investigates the effect of initial volume fraction on the runout characteristics of collapse of granular columns on slopes in fluid. 2-D sub-grain scale numerical simulations are performed to understand the flow dynamics of granular collapse in fluid. The discrete element method (DEM) technique is coupled with the lattice Boltzmann method (LBM), for fluid-grain interactions, to understand the evolution of submerged granular flows. The fluid phase is simulated using multiple-relaxation-time LBM (LBM-MRT) for numerical stability. In order to simulate interconnected pore space in 2-D, a reduction in the radius of the grains (hydrodynamic radius) is assumed during LBM computations. The collapse of granular column in fluid is compared with the dry cases to understand the effect of fluid on the runout behaviour. A parametric analysis is performed to assess the influence of the granular characteristics (initial packing) on the evolution of flow and run-out distances for slope angles of 0°, 2.5°, 5° and 7.5°. The granular flow dynamics is investigated by analysing the effect of hydroplaning, water entrainment and viscous drag on the granular mass. The mechanism of energy dissipation, shape of the flow front, water entrainment and evolution of packing density is used to explain the difference in the flow characteristics of loose and dense granular column collapse in fluid.</p></div>","PeriodicalId":66131,"journal":{"name":"水动力学研究与进展:英文版","volume":"29 4","pages":"Pages 529-541"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1001-6058(16)60766-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4007496","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: 31

Double-averaging analysis of turbulent kinetic energy fluxes and budget based on large-eddy simulation 基于大涡模拟的湍流动能通量和收支双平均分析

3区工程技术

水动力学研究与进展:英文版 Pub Date : 2017-08-01 DOI: 10.1016/S1001-6058(16)60769-2

Xu Han (韩旭), Guo-jian He (何国建), Hong-wei Fang (方红卫)

引用次数: 11