Journal of Hydrodynamics最新文献_第3页

Cylindrical bubble dynamics in triple-frequency acoustic field 三频声场中的圆柱气泡动力学

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-22 DOI: 10.1007/s42241-024-0068-9

Jia-xin Yu, Zhi-hao Liu, Jin-sen Hu, Xiao-yu Wang, Xiang-qing Zhang, Jun-wei Shen, Yu-ning Zhang

{"title":"Cylindrical bubble dynamics in triple-frequency acoustic field","authors":"Jia-xin Yu, Zhi-hao Liu, Jin-sen Hu, Xiao-yu Wang, Xiang-qing Zhang, Jun-wei Shen, Yu-ning Zhang","doi":"10.1007/s42241-024-0068-9","DOIUrl":"10.1007/s42241-024-0068-9","url":null,"abstract":"<div><p>In this paper, the dynamic characteristics of the cylindrical bubbles under triple-frequency acoustic excitation are investigated theoretically. The analytical solution of the primary-superharmonic-subharmonic (PRI-SUPER-SUB) simultaneous resonance is obtained through the multi-scale method. Based on the analysis of the frequency response, the influencing mechanisms of the primary parameters (e.g., the total amplitude, amplitude ratio, liquid viscosity, polytropic exponent, and bubble equilibrium radius) on the resonance are investigated quantitatively. The main conclusions include: (1) The solution for the simultaneous resonance of the cylindrical bubble exhibits jumping and hysteresis phenomena in the vicinity of the resonance frequency. (2) As the total amplitude, amplitude ratio, and equilibrium radius increase, the response amplitude of the PRI-SUPER-SUB simultaneous resonance increases, while the influence of the viscosity is the opposite. (3) The regions dominated by the instability of the simultaneous resonance is significantly affected by the system parameters.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 5","pages":"947 - 953"},"PeriodicalIF":2.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798285","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

Wave height forecast method with uncertainty quantification based on Gaussian process regression 基于高斯过程回归的不确定性量化波高预报方法

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-22 DOI: 10.1007/s42241-024-0070-2

Zi-lu Ouyang, Chao-fan Li, Ke Zhan, Chuan-qing Li, Ren-chuan Zhu, Zao-jian Zou

引用次数: 0

Fluctuation characteristics and topological interface states in the quasi-periodic structures of shallow-water waves 浅水波准周期结构中的涨落特征和拓扑界面态

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-22 DOI: 10.1007/s42241-024-0069-8

Xue Guan, Bo-ya Xiao, Yu Liu, Meng Chen

{"title":"Fluctuation characteristics and topological interface states in the quasi-periodic structures of shallow-water waves","authors":"Xue Guan, Bo-ya Xiao, Yu Liu, Meng Chen","doi":"10.1007/s42241-024-0069-8","DOIUrl":"10.1007/s42241-024-0069-8","url":null,"abstract":"<div><p>Compared with periodic structures, quasi-periodic structures have superior band gap properties and topological interface states. In this paper, a one-dimensional quasi-periodic Fibonacci water wave metamaterial model that can be used to apply quasi-periodic structures to shallow-water wave systems is presented. The fluctuation characteristics of periodic and quasi-periodic structures are examined using finite element numerical calculations based on the shallow-water wave equation. The research results show that the band characteristics of quasi-periodic structures are complex, enabling flexible control of the propagation of shallow-water waves. Furthermore, the mirror-symmetrical design of Fibonacci quasi-periodic water wave metamaterials was created to engineer the topological interface states in shallow-water wave systems, ultimately achieving successful localization of wave energy. This research will greatly enrich our understanding of topology, expand the potential applications of quasi-periodic structures, and provide new insights for manipulating water waves and harvesting energy.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 5","pages":"925 - 933"},"PeriodicalIF":2.5,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798287","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 backward-facing step heights in vegetation-step model on reducing the velocity of a tsunami inundation and increasing the energy dissipation efficiency 植被台阶模型中台阶后向高度对降低海啸淹没速度和提高能量耗散效率的影响

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-15 DOI: 10.1007/s42241-024-0064-0

Wen-xin Huai, Xiao-hua Zhang, Dan Li, Zhong-hua Yang, Yi-dan Ai

{"title":"Effect of backward-facing step heights in vegetation-step model on reducing the velocity of a tsunami inundation and increasing the energy dissipation efficiency","authors":"Wen-xin Huai, Xiao-hua Zhang, Dan Li, Zhong-hua Yang, Yi-dan Ai","doi":"10.1007/s42241-024-0064-0","DOIUrl":"10.1007/s42241-024-0064-0","url":null,"abstract":"<div><p>A coastal forest combined with a backward-facing step is an efficient facility to reduce tsunami damage to residential areas behind sea embankments. This study establishes a generalized model, and experimentally explores the water level changes upstream of the vegetation-step mitigation model as well as its energy dissipation effect under different initial Froude numbers, step heights, and vegetation conditions. The results show that the relative backwater rise increases with the growth of vegetation density, patch length and initial Froude number, representing a slowing down of the tsunami inundation. As for energy dissipation, it is mainly caused by the additional resistance of the vegetation and the hydraulic jump. And the vegetation condition not only affects the energy dissipation due to stem-scale turbulence within the patch, but also changes the hydraulic jump process of water falling from the step in cooperation with the step height. As a result, the energy dissipation efficiency always increases with the growth of vegetation density, vegetation patch length and step height. With the criterion that the energy dissipation efficiency and its growth rate can hardly change with vegetation parameters, this study innovatively defines the threshold slope and gives the principle of judging the most cost-effective vegetation conditions at different step heights. These results are expected to provide an important reference for the design of composite tsunami mitigation facilities.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 5","pages":"803 - 816"},"PeriodicalIF":2.5,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798567","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

Double-averaged velocity profile and its representative line for turbulent flows over two-dimensional fixed dunes 二维固定沙丘湍流双平均速度剖面及其代表线

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-15 DOI: 10.1007/s42241-024-0066-y

Pu-er Xu, Nian-Sheng Cheng, Dong-xin Guo

引用次数: 0

A GPU-accelerated two-phase flow model for fluid-solid interaction using the sharp interface immersed boundary method 基于锐界面浸入边界法的gpu加速流固两相流模型

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-15 DOI: 10.1007/s42241-024-0065-z

Li-ping Ma, Ji-jian Lian, Dong-ming Liu

{"title":"A GPU-accelerated two-phase flow model for fluid-solid interaction using the sharp interface immersed boundary method","authors":"Li-ping Ma, Ji-jian Lian, Dong-ming Liu","doi":"10.1007/s42241-024-0065-z","DOIUrl":"10.1007/s42241-024-0065-z","url":null,"abstract":"<div><p>A two-phase flow model accelerated by graphical processing unit (GPU) is developed to solve fluid-solid interaction (FSI) using the sharp-interface immersed boundary method (IBM). This model solves the incompressible Navier-Stokes equations using the projection-based fractional step method in a fixed staggered Cartesian grid system. A volume of fluid (VOF) method with second-order accuracy is employed to trace the free surface. To represent the intricate surface geometry, the structure is discretized using the unstructured triangle mesh. Additionally, a ray tracing method is employed to classify fluid and solid points. A high-order stable scheme has been introduced to reconstruct the local velocity at interface points. Three FSI problems, including wave evolution around a breakwater, interaction between a periodic wave train and a moving float, and a 3-D moving object interacting with the free surface, were investigated to validate the accuracy and stability of the proposed model. The numerical results are in good agreement with the experimental data. Additionally, we evaluated the computational performance of the proposed GPU-based model. The GPU-based model achieved a 42.29 times speedup compared with the single-core CPU-based model in the three-dimension test. Additionally, the results regarding the time cost of each code section indicate that achieving more significant acceleration is associated with solving the turbulence, advection, and diffusion terms, while solving the pressure Poisson equation (PPE) saves the most time. Furthermore, the impact of grid number on computational efficiency indicates that as the number of grids increases, the GPU-based model outperforms the multi-core CPU-based model.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 5","pages":"883 - 897"},"PeriodicalIF":2.5,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798568","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

Examination on behavior of tip leakage flow in a three-stage gas-liquid two-phase flow pump 三级气液两相流泵叶尖泄漏流动特性的研究

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-08 DOI: 10.1007/s42241-024-0063-1

Si-na Yan, Xing-qi Luo, Jian-jun Feng, Shuai-hui Sun, Guo-jun Zhu, Xin Wu

{"title":"Examination on behavior of tip leakage flow in a three-stage gas-liquid two-phase flow pump","authors":"Si-na Yan, Xing-qi Luo, Jian-jun Feng, Shuai-hui Sun, Guo-jun Zhu, Xin Wu","doi":"10.1007/s42241-024-0063-1","DOIUrl":"10.1007/s42241-024-0063-1","url":null,"abstract":"<div><p>Tip leakage flow (TLF) trajectory in a pump with gas entrainment is investigated via visualization experiments and numerical simulations. Starting position of tip leakage vortex (TLV) is determined accurately by numerical simulation. Under high liquid flow rate (<i>Q</i><sub><i>l</i></sub>) and high inlet gas volume fraction (IGVF) conditions, TLF flows from suction surface to pressure surface near the leading edge of blade, and the direction of TLF gradually changes along the chord which flows from pressure surface to suction surface near the tailing edge. The angle between TLF and blade mean camberline increases progressively as either <i>Q</i><sub><i>l</i></sub> or IGVF decreases, and starting position of TLV moves towards leading edge direction. As <i>Q</i><sub><i>l</i></sub> or IGVF decreases, value of vorticity increases and high vorticity region moves towards leading edge. The entropy production rate at blade tip clearance is high, and entropy diffuses from pressure surface to suction surface due to jet flow in blade tip clearance. The greater the amount of accumulated gas there is, the greater the amount of entropy in the area. In addition, when gas is entrained in pump, there are many low frequency fluctuations generated in blade tip clearance.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 5","pages":"843 - 853"},"PeriodicalIF":2.5,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798348","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 study of the rheological characteristics and flow law of water-based drilling fluids in high-temperature and high-pressure wellbores 高温高压井筒中水基钻井液流变特性及流动规律的实验与数值研究

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-01 DOI: 10.1007/s42241-024-0062-2

Le-le Yang, Bin Li, Xiao-dong Chen, Liang Yu, Feng-mei Jing, Dong Zhang

{"title":"Experimental and numerical study of the rheological characteristics and flow law of water-based drilling fluids in high-temperature and high-pressure wellbores","authors":"Le-le Yang, Bin Li, Xiao-dong Chen, Liang Yu, Feng-mei Jing, Dong Zhang","doi":"10.1007/s42241-024-0062-2","DOIUrl":"10.1007/s42241-024-0062-2","url":null,"abstract":"<div><p>The local distributions of both the temperature and pressure have a great influence on the rheological characteristics of the drilling fluid, thereby affecting its flow law in a wellbore. Along these lines, in this work, the rheology of water-based drilling fluid samples under high-temperature (30°C–210°C) and high-pressure (34.5 MPa–172.4 MPa) (HTHP) conditions was systematically analyzed. The constitutive model of the variation of the apparent viscosity of the drilling fluid with the temperature and pressure was successfully established. The analysis revealed that, among the Bingham model, the Power law model, the Herschel-Bulkley (H-B) model, and the Casson model, the H-B model can accurately describe the rheology of the drilling fluid under HTHP conditions. Therefore, the H-B model was used to perform numerical simulations of the flow law of the water-based drilling fluid in the wellbore. The simulation results demonstrated that the drilling fluid viscosity decreased as the depth of the wellbore increased, and was mainly influenced by the temperature. The maximum viscosity inside the drill pipe was mainly concentrated in the middle region, and that of the fluid when flowing in the annulus was mainly concentrated on the side near the outer wall of the annulus. This work provides valuable insights for setting the key parameters of the drilling fluid and wellbore cleaning in the drilling operation of a 1×10<sup>4</sup> m deep well.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 5","pages":"954 - 967"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798290","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 cloud cavitating flow in a venturi using adaptive mesh refinement 文丘里腔内云空化流的自适应网格细化研究

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-11-01 DOI: 10.1007/s42241-024-0061-3

Dhruv Apte, Mingming Ge, Olivier Coutier-Delgosha

{"title":"Investigation of cloud cavitating flow in a venturi using adaptive mesh refinement","authors":"Dhruv Apte, Mingming Ge, Olivier Coutier-Delgosha","doi":"10.1007/s42241-024-0061-3","DOIUrl":"10.1007/s42241-024-0061-3","url":null,"abstract":"<div><p>Unsteady cloud cavitating flow is detrimental to the efficiency of hydraulic machinery like pumps and propellers due to the resulting side-effects of vibration, noise and erosion damage. Modelling such a unsteady and highly turbulent flow remains a challenging issue. In this paper, cloud cavitating flow in a venturi is calculated using the detached eddy simulation (DES) model combined with the Merkle model. The adaptive mesh refinement (AMR) method is employed to speed up the calculation and investigate the mechanisms for vortex development in the venturi. The results indicate the velocity gradients and the generalized fluid element strongly influence the formation of vortices throughout a cavitation cycle. In addition, the cavitation-turbulence coupling is investigated on the local scale by comparing with high-fidelity experimental data and using profile stations. While the AMR calculation is able to predict well the time-averaged velocities and turbulence-related aspects near the throat, it displays discrepancies further downstream owing to a coarser grid refinement downstream and under-performs compared to a traditional grid simulation. Additionally, the AMR calculation is unable to reproduce the cavity width as observed in the experiments. Therefore, while AMR promises to speed the process significantly by refining the grid only in regions of interest, it is comparatively in line with a traditional calculation for cavitating flows. Thus this study intends to provide a reference to employing the AMR as a tool to speed up calculations and be able to simulate turbulence-cavitation interactions accurately.</p></div>","PeriodicalId":637,"journal":{"name":"Journal of Hydrodynamics","volume":"36 5","pages":"898 - 913"},"PeriodicalIF":2.5,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798289","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

Hydrodynamic instability of vegetated shear flows 植被剪切流的水动力不稳定性

IF 2.5 3区工程技术

Journal of Hydrodynamics Pub Date : 2024-10-24 DOI: 10.1007/s42241-024-0060-4

Rajesh K. Mahato

引用次数: 0