- 作 者: ( "shixiao fu" OR "shi-xiao fu" )
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Experimental investigation on vortex-induced force of a flexible pipe under oscillatory flowApplied Ocean Research (IF 3.761) Pub Date : 2022-07-17 ,DOI:10.1016/j.apor.2022.103269Mengmeng Zhang, Shixiao Fu, Haojie Ren, Yuwang Xu, Xu QinIn this paper, vortex-induced force (VIF) characteristics of a flexible pipe under oscillatory flow are experimentally investigated with different KC numbers ranging from 10 to 178, and reduced velocities from 4 to 7.9. The strain information caused by vortex-induced vibration (VIV) at different cross-sections on the flexible cylinder is measured in the model test. Combined with the modal superposition ...
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Numerical study of vortex-induced vibrations of a circular cylinder at different incidence anglesOcean Engineering (IF 4.372) Pub Date : 2022-07-08 ,DOI:10.1016/j.oceaneng.2022.111858Yun Gao, Zecheng Jiang, Leixin Ma, Shixiao Fu, Guanghua He, Chen ShiThe effects of four different incidence angles (α) on the vortex-induced vibration (VIV) response of a two degrees-of-freedom cylinder were studied using the two-dimensional unsteady Reynolds-averaged Navier-Stokes equation and shear stress transport k-ω model, combined with the fourth-order Runge-Kutta method. The VIV characteristics, including the structural vibration amplitude, vibration frequency ...
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Numerical prediction of vortex-induced vibrations of a long flexible riser with an axially varying tension based on a wake oscillator modelMarine Structures (IF 4.5) Pub Date : 2022-07-02 ,DOI:10.1016/j.marstruc.2022.103265Yun Gao, Lei Liu, Ganghui Pan, Shixiao Fu, Shenglin Chai, Chen ShiA numerical study based on the wake oscillator model has been conducted to determine the vortex-induced vibration (VIV) responses of a flexible riser with an axial time-varying tension. Three different types of flows, viz., linear shear, exponential shear, and real stepped flows, have been considered. The coupling equations of a structural oscillator and a wake oscillator have been solved using a standard ...
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Experimental Research on Vortex-Induced Force Characteristics of Flexible Riser with Buoyancy Module and StrakesApplied Sciences (IF 2.838) Pub Date : 2022-06-17 ,DOI:10.3390/app12126180Lusheng Jia, Yi Liu, Mengmeng Zhang, Shixiao Fu, Haojie Ren
In this paper, the vortex-induced force characteristics of a flexible riser with buoyancy modules and strakes were experimentally investigated. The strain information caused by vortex-induced vibration (VIV) at different cross-sections on the flexible cylinder was measured in the model test. Combined with the modal superposition method and inverse analysis method for vortex-induced force, the vortex-induced
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An experimental investigation on interfering VIVs of double and triple unequal-diameter flexible cylinders in tandemMarine Structures (IF 4.5) Pub Date : 2022-05-19 ,DOI:10.1016/j.marstruc.2022.103247Bing Zhao, Shixiao Fu, Mengmeng Zhang, Haojie Ren, Liangbin Xu, Wenhui Xie, Lusheng JiaMany unequal-diameter risers have been widely applied to satisfy different operational requirements in ocean oil and gas drilling engineering, and adjacent tandem risers can undergo complex vibration responses and even collisions under ocean flow conditions. To investigate the wake interference responses for multiple risers in tandem configuration, an experiment of double and triple unequal-diameter ...
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Investigation of pitch angles on the aerodynamics of twin-VAWT under staggered arrangementOcean Engineering (IF 4.372) Pub Date : 2022-04-28 ,DOI:10.1016/j.oceaneng.2022.111385Yaoran Chen, Limin Kuang, Jie Su, Dai Zhou, Yong Cao, Hao Chen, Zhaolong Han, Yongsheng Zhao, Shixiao FuThe potential applications of twin vertical axis wind turbines (VAWTs) in oceanic wind energy harvesting have drawn increasing attention. Previous researches have focused on the influence of relative location, rotational direction, tip speed ratio, etc. on the power output of this system. However, limited studies have been done to uncover the effect of pitch angles on their aerodynamic performance ...
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Application of a modified wake oscillator model to vortex-induced vibration of a free-hanging riser subjected to vessel motionOcean Engineering (IF 4.372) Pub Date : 2022-04-14 ,DOI:10.1016/j.oceaneng.2022.111165Yang Qu, Shixiao Fu, Yuwang Xu, Jun HuangA modified wake oscillator model for modelling vortex-induced vibrations (VIVs) of a free-hanging riser subjected to vessel motion is presented. Different from the conventional wake oscillators which have typically utilized in the prediction of steady flow VIVs , the new model can be applied to simulate VIVs introduced by the vessel motion where the flows around the riser are not known in advance. ...
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Autotrophic respiration is more sensitive to nitrogen addition and grazing than heterotrophic respiration in a meadow steppeCatena (IF 6.367) Pub Date : 2022-03-11 ,DOI:10.1016/j.catena.2022.106207Baoku Shi, Xiao Fu, Melinda D. Smith, Anping Chen, Alan K. Knapp, Chengliang Wang, Wanling Xu, Rui Zhang, Weifeng Gao, Wei SunA quantitative understanding of temporal patterns of soil respiration (SR) and its components, as well as of their controlling factors, are key to the estimation of grassland C sequestration under different scenarios of land-use change and global change. However, the sensitivity of seasonal patterns and magnitude of SR and its components to N addition (N) and grazing (G) and their interactions remains ...
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A hybrid FEM-DNN-based vortex-induced Vibration Prediction Method for Flexible Pipes under oscillatory flow in the time domainOcean Engineering (IF 4.372) Pub Date : 2022-01-18 ,DOI:10.1016/j.oceaneng.2021.110488Mengmeng Zhang, Shixiao Fu, Haojie Ren, Leixin Ma, Yuwang XuIn this paper, a hybrid FEM-DNN-based vortex-induced vibration (VIV) prediction method for flexible pipes under an oscillatory flow in the time domain is proposed. In this method, a vortex-induced force coefficient model is regressed by a deep neural network (DNN) from experimental data. The model takes into account the effects of flow velocity variation, VIV responses and their coupling features on ...
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Numerical study on the characteristics of vortex-induced vibrations of a small-scale subsea jumper using a wake oscillator modelOcean Engineering (IF 4.372) Pub Date : 2021-12-13 ,DOI:10.1016/j.oceaneng.2021.110028Yang Qu, Shixiao Fu, Zhenhui Liu, Yuwang Xu, Jiayang Sun
Vortex-induced vibrations (VIVs) of a small-scale subsea jumper has been studied numerically using a wake oscillator model. The dynamics of the jumper is described based on the linear Euler–Bernoulli beam theory and a wake oscillator model is uniformly distributed along the jumper to model the hydrodynamic force acting on it. The dynamics of the coupled system has been solved using the finite element
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Numerical simulation of wave-induced hydroelastic response and flow-induced vibration of a twin-tube submerged floating tunnelMarine Structures (IF 4.5) Pub Date : 2021-11-30 ,DOI:10.1016/j.marstruc.2021.103124Shi Deng, Yuwang Xu, Haojie Ren, Shixiao Fu, Shuai Li, Torgeir Moan, Zhen GaoThe Norwegian Public Road Administration is planning to upgrade Coastal Highway E39 by replacing ferry connections with floating bridges or submerged floating tunnels (SFTs). This study considers a potential pontoon-supported curved SFT designed for crossing Sognefjorden at a submergence of 12 m. It consists of two identical tubes with a diameter of 12.6 m each in a tandem configuration and with a ...
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Experimental investigation on vortex-induced force of a Steel Catenary Riser under in-plane vessel motionMarine Structures (IF 4.5) Pub Date : 2021-03-15 ,DOI:10.1016/j.marstruc.2020.102882Mengmeng Zhang, Shixiao Fu, Chang Liu, Haojie Ren, Yuwang XuA method to identify vortex-induced forces and coefficients from measured strains of a Steel Catenary Riser (SCR) undergoing vessel motion-induced Vortex-induced Vibration (VIV) is proposed. Euler–Bernoulli beam vibration equations with time-varying tension is adopted to describe the out-of-plane VIV responses. Vortex-induced forces are reconstructed via inverse analysis method, and the Forgetting ...
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The influence of regular wave and irregular wave on the mechanical characteristics of a triple-cylinder bundle structureOcean Engineering (IF 4.372) Pub Date : 2020-12-30 ,DOI:10.1016/j.oceaneng.2020.108379Zhihao Zhang, Jiahuang Tu, Yongkang He, Zhaolong Han, He Yang, Dai Zhou, Shixiao FuBy using the open source DualSPHysics, the interaction between wave and a triple-cylinder bundle structure is numerically investigated. The wave is generated by applying the predefined function to the wave maker, and the free surface and the velocity of the regular wave and irregular wave are compared with the theoretical data at the measuring point. To verify the feasibility of the numerical method ...
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Influence of the center cylinder on the flow characteristics of four- and five-cylinder arrays at subcritical Reynolds numberOcean Engineering (IF 4.372) Pub Date : 2020-12-01 ,DOI:10.1016/j.oceaneng.2020.108245Jiahuang Tu, Zhihao Zhang, Haiyu Lv, Zhaolong Han, Dai Zhou, He Yang, Shixiao FuAbstract The three-dimensional flow around the four-cylinder and five-cylinder arrays are numerically studied at Re = 3900 by large eddy simulation (LES). By selecting eight spacing ratios (L/D = 2.0–7.0) and three incidence angles (α = 0°–45°), the influence of the center cylinder on the flow characteristics and interference effects of the four-cylinder array is discussed. Different spacing ratios ...
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Experimental study on the drag forces on a twin-tube submerged floating tunnel segment model in currentApplied Ocean Research (IF 3.761) Pub Date : 2020-11-01 ,DOI:10.1016/j.apor.2020.102326Shi Deng, Haojie Ren, Yuwang Xu, Shixiao Fu, Torgeir Moan, Zhen GaoAbstract In this paper, the drag forces on a rigid segment of a twin-tube submerged floating tunnel (SFT) under various Re number and submergence are experimentally investigated with a simplified rigidly connected tandem twin-cylinder model towed in a tank. The effects of the spacing distance between two cylinders and vortex-induced vibration (VIV) on the drag forces are investigated through stationary ...
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An experiment study of vortex induced vibration of a steel catenary riser under steady currentJournal of Hydrodynamics (IF 2.983) Pub Date : 2020-10-29 ,DOI:10.1007/s42241-020-0067-4Tie Ren, Yu-wang Xu, Jungao Wang, Hao-jie Ren, Meng-meng Zhang, Shi-xiao Fu, Yao-song ChenThe vortex induced vibration (VIV) of marine risers has been investigated by many researchers in experimental studies of a straight flexible riser model as well as a rigid cylinder to reveal the dynamic response characteristic and the mechanics behind it. However, due to the limitation of experimental apparatus, very few studies are about the VIV of a steel catenary riser (SCR) which is with a complex ...
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Hydrodynamic Forces of a Semi-Submerged Cylinder in an Oscillatory FlowApplied Sciences (IF 2.838) Pub Date : 2020-09-14 ,DOI:10.3390/app10186404Haojie Ren, Shixiao Fu, Chang Liu, Mengmeng Zhang, Yuwang Xu, Shi Deng
This work experimentally investigated the performance of hydrodynamic forces on a semi-submerged cylinder under an oscillatory flow. To generate the equivalent oscillatory flow, the semi-submerged cylinder is forced to oscillate in several combinations of different periods and amplitudes. The mean downward lift force was observed to be significant and the fluctuating lift forces show dominant frequency
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The Performance Assessment of a Semisubmersible Platform Subjected to Wind and Waves by a CFD/6-DOF ApproachShock and Vibration (IF 1.616) Pub Date : 2020-08-19 ,DOI:10.1155/2020/8871409Hongbo Zhu, Dai Zhou, Zhaolong Han, Jin Ma, Yan Bao, Shixiao Fu
The semisubmersible platform is one of the most important equipment for the exploitation of deep-sea oil and gas. And its survival and operational capacities depend on the towing and motion performances. The present work investigates the properties of different platform component designs based on their towing and motion performances under wind and waves by using an integrated computational fluid dynamics
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Drag and added mass coefficients of a flexible pipe undergoing vortex-induced vibration in an oscillatory flowOcean Engineering (IF 4.372) Pub Date : 2020-08-01 ,DOI:10.1016/j.oceaneng.2020.107541Haojie Ren, Mengmeng Zhang, Yifan Wang, Yuwang Xu, Shixiao Fu, Xuepeng Fu, Bing ZhaoAbstract The drag and added mass coefficients of a flexible pipe undergoing vortex-induced vibration (VIV) in an oscillatory flow are investigated experimentally with maximum reduced velocities ranging from 4 to 7.9 and Keulegan-Carpenter (KC) numbers ranging from 10 to 178. The strain responses are measured by fiber bragg grating sensors. By using displacement reconstruction and inverse analysis methods ...
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Magnification of hydrodynamic coefficients on a flexible pipe fitted with helical strakes in oscillatory flowsOcean Engineering (IF 4.372) Pub Date : 2020-08-01 ,DOI:10.1016/j.oceaneng.2020.107543Haojie Ren, Mengmeng Zhang, Jingyun Cheng, Peimin Cao, Yuwang Xu, Shixiao Fu, Chang Liu, Yifan WangAbstract The features of hydrodynamic coefficients including drag and added mass coefficients on a flexible pipe fitted with helical strakes in an oscillatory flow are studied experimentally. The experiment of a flexible straked pipe was conducted in an oscillatory flow with the Keulegan-Carpenter (KC) number varying from 9 to 165 and the maximum reduced velocities ranging from 4 to 8. Strain response ...
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Experimental Investigation on Vortex-Induced Vibration of a Flexible Pipe under Higher Mode in an Oscillatory FlowJournal of Marine Science and Engineering (IF 2.744) Pub Date : 2020-06-04 ,DOI:10.3390/jmse8060408Haojie Ren, Mengmeng Zhang, Jingyun Cheng, Peimin Cao, Yuwang Xu, Shixiao Fu, Chang Liu
Different from the previous studies of the vortex-induced vibration (VIV) dominated by first mode of flexible pipe in an oscillatory flow, the features of a higher mode dominated are experimentally investigated in the ocean basin. The flexible pipe is forced to harmonically oscillate with different combinations of a period and amplitude. The design dominant mode consists of first and second modes under
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Hydrodynamics of a flexible cylinder under modulated vortex-induced vibrationsJournal of Fluids and Structures (IF 3.482) Pub Date : 2020-04-01 ,DOI:10.1016/j.jfluidstructs.2020.102913Chang Liu, Shixiao Fu, Mengmeng Zhang, Haojie Ren, Yuwang XuAbstract Both amplitude modulation and frequency modulation of Vortex-induced Vibration (VIV) are observed in a recent model test of a flexible cylinder under oscillatory flow, but its hydrodynamics has not yet been broached in detail. This paper employs the Forgetting Factor Least Squares (FF-LS) method for identification of time-varying hydrodynamics of a flexible cylinder under modulated VIV. The ...
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Experimental study of vortex-induced vibration of a twin-tube submerged floating tunnel segment modelJournal of Fluids and Structures (IF 3.482) Pub Date : 2020-04-01 ,DOI:10.1016/j.jfluidstructs.2020.102908Shi Deng, Haojie Ren, Yuwang Xu, Shixiao Fu, Torgeir Moan, Zhen GaoAbstract The cross-flow vortex-induced vibration features of a submerged floating tunnel element, which is composed of two rigidly connected cylinders in a tandem configuration, were investigated via a self-oscillation model test in a steady flow. The Reynolds number ranged from 2 × 104 to 9 × 104, and the ratio of the center-to-center distance between the two cylinders and cylinder diameter varied ...
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Three-dimensional wake transition in the flow over four square cylinders at low Reynolds numbersAip Advances (IF 1.697) Pub Date : 2020-01-01 ,DOI:10.1063/1.5129744Yuhang Zhang,Rui Wang,Yaoran Chen,Yan Bao,Zhaolong Han,Dai Zhou,Huan Ping,Shixiao Fu,Yongsheng Zhao
The three-dimensional characteristics of the flow past four square cylinders in an in-line square configuration, with five spacing ratios ranging from 1.4 to 5, were studied in depth in this study. Direct numerical simulation of the spectral/hp element method was employed at Re = 150 and 200. The onset and evolution of various unstable modes were expounded in detail by means of three-dimensional vortices
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Vortex-induced vibration of flexible pipe fitted with helical strakes in oscillatory flowOcean Engineering (IF 4.372) Pub Date : 2019-10-01 ,DOI:10.1016/j.oceaneng.2019.106274Haojie Ren, Yuwang Xu, Jingyun Cheng, Peimin Cao, Mengmeng Zhang, Shixiao Fu, Ziyang ZhuAbstract Helical strakes are widely used to suppress vortex-induced vibration (VIV) in offshore engineering. However, the VIV response and suppression efficiency of the straked pipe remain unclear in an oscillatory flow. In this paper, an experimental study of VIV for a flexible pipe fitted with helical strakes was conducted in an oscillatory flow with the Keulegan-Carpenter (KC) number varying from ...
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Distribution of drag coefficients along a flexible pipe with helical strakes in uniform flowOcean Engineering (IF 4.372) Pub Date : 2019-07-01 ,DOI:10.1016/j.oceaneng.2019.05.038Haojie Ren, Yuwang Xu, Mengmeng Zhang, Shixiao Fu, Yanxin Meng, Chenyang HuangAbstract The influences of helical strake geometry and vortex-induced vibration (VIV) on the drag coefficients of a long flexible pipe with helical strakes are investigated through uniform flow experiments with the Reynolds (Re) number ranging from 1.1 × 104 to 9.5 × 104. The strains caused by drag forces of a bare pipe and six different straked pipes are measured by fiber bragg grating (FBG) sensors ...
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Hydrodynamic forces on a partially submerged cylinder at high Reynolds number in a steady flowApplied Ocean Research (IF 3.761) Pub Date : 2019-07-01 ,DOI:10.1016/j.apor.2019.04.025Haojie Ren, Yuwang Xu, Mengmeng Zhang, Shi Deng, Shuai Li, Shixiao Fu, Hao SunAbstract The hydrodynamic forces on the stationary partially submerged cylinder are investigated through towing test with Reynolds number ranging from 5 × 104 to 9 × 105. Three test groups of partially submerged cylinders with submerged depths of 0.25 D, 0.50 D, and 0.75 D and one validation group of fully submerged cylinders are conducted. During the experiments, the hydrodynamic forces on the cylinders ...
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An efficient time-domain prediction model for vortex-induced vibration of flexible risers under unsteady flowsMarine Structures (IF 4.5) Pub Date : 2019-03-01 ,DOI:10.1016/j.marstruc.2018.12.005Ziqi Lu, Shixiao Fu, Mengmeng Zhang, Haojie RenAbstract In this study, an efficient time-domain prediction model is developed to predict unsteady flow vortex-induced vibrations (VIV) of flexible risers. The hydrodynamic forces on flexible risers are calculated on the basis of forced oscillation experiments on rigid cylinders. A period identification criterion, based on the spatial and temporal variations of reduced velocity, is proposed to divide ...
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Evaluation of vortex-induced vibration of a steel catenary riser in steady current and vessel motion-induced oscillatory currentJournal of Fluids and Structures (IF 3.482) Pub Date : 2018-10-01 ,DOI:10.1016/j.jfluidstructs.2018.07.018Jungao Wang, Shixiao Fu, Rolf BaarholmAbstract A large-scale model test of a truncated steel catenary riser (SCR) was performed in an ocean basin to investigate the riser responses under pure steady uniform current and pure vessel motions separately. Out-of-plane vortex-induced vibration (VIV) was confirmed to have occurred under both test conditions. A comparative analysis and discussion were carried out on selected cases in terms of ...
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Hydrodynamics of A Flexible Riser Undergoing the Vortex-Induced Vibration at High Reynolds NumberChina Ocean Engineering (IF 0.835) Pub Date : 2018-09-26 ,DOI:10.1007/s13344-018-0059-0Tie Ren, Meng-meng Zhang, Shi-xiao Fu, Lei-jian Song
This study proposed a method to obtain hydrodynamic forces and coefficients for a flexible riser undergoing the vortex-induced vibration (VIV), based on the measured strains collected from the scale-model testing with the Reynolds numbers ranging from 1.34E5 to 2.35E5. The riser is approximated as a tensioned spatial beam, and an inverse method based on the FEM of spatial beam is adopted for the calculation
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