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A nonlinear wake model of a wind turbine considering the yaw wake steering

Journal of oceanology and Limnology 2024年第3期42卷 715-727页

作者： Yunzhou LI Zhiteng GAO Shoutu LI Suiping QI Xiaoyu TANG College of Meteorology and oceanography National University of Defense TechnologyChangsha 410073China Multi-function Towing Tank School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Energy and Power engineering Lanzhou University of TechnologyLanzhou 730050China Institute of oceanographic Instrumentation Qilu University of Technology(Shandong Academy of Sciences)Qingdao 266061China State key laboratory of Industrial Control Technology College of Control Science and EngineeringZhejiang UniversityHangzhou 310027China Laoshan laboratory Qingdao 266237China

Duo to fluctuations in atmospheric turbulence and yaw control strategies,wind turbines are often in a yaw *** predict the far wake velocity field of wind turbines quickly and accurately,a wake velocity model was derived based on the method of momentum conservation considering the wake steering of the wind turbine under yaw *** consider the shear effect of the vertical incoming wind direction,a two-dimensional Gaussian distribution function was introduced to model the velocity loss at different axial positions in the far wake region based on the assumption of nonlinear wake *** work also developed a“prediction-correction”method to solve the wake velocity field,and the accuracy of the model results was verified in wake experiments on the Garrad Hassan wind ***,a 33-kW two-blade horizontal axis wind turbine was simulated using this method,and the results were compared with the classical wake model under the same parameters and the computational fluid dynamics(CFD)simulation *** results show that the nonlinear wake model well reflected the influence of incoming flow shear and yaw wake steering in the wake velocity ***,computation of the wake flow for the Horns Rev offshore wind farm with 80 wind turbines showed an error within 8%compared to the experimental *** established wake model is less computationally intensive than other methods,has a faster calculation speed,and can be used for engineering calculations of the wake velocity in the far wakefield of wind turbines.

关键词： far wake wake model wake steering wind shear wind farm

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Precontrol of short-period motion for a Tension Leg Platform

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Journal of ocean engineering and Science 2024年第3期9卷 264-277页

作者： Hao Wu Yan Lin Yongxi Wu School of Mechatronic engineering and Automation Shanghai UniversityShanghai 200444China Department of naval architecture Dalian University of TechnologyDalian 116023China State key laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116023China School of Mechanics and engineering Science Shanghai UniversityShanghai 200444China

The Tension Leg Platform(TLP)is a hybrid,compliant platform designed to sustain springing and ringing responses that are correlated to short-period *** the period of short-period motion is within the wave energy concentration region,TLPs may experience sensitive short-period motion,such as resonance and green water,that usually cause serious damage to *** this study,a precontrol methodology is presented as a solution to prevent TLP-sensitive short-period *** applying the precontrol methodology,the parameters of TLP can be predetermined,allowing TLP motion performance to meet the requirements of short-period motion before sensitive motions actually *** example,the damping coefficient should be less than 4.3,the tendons’stiffness should be larger than 0.91×10^(8),and the dimensionless draft should be less than *** development of a precontrol methodology is based on a solid theoretical ***,a series of simple and high-fidelity numerical models are proposed to simulate the natural period of roll,natural period of heave,and green water ***,a constraint regime is generated based on the numerical models and the sensitive motion range of short-period *** constraint regime is divided into two parts:the control range(corresponding to sensitive shortperiod motion)and the feasible range(the complementary set of control ranges in the whole parameter constraint domain).Finally,TLP parameters are derived from the calculated feasible *** precontrol methodology goes beyond the conventional approach of real-time control by changing the control from a remedial action to a preventive action.

关键词： Precontrol Constraint regime Short-period motion TLP

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水下航行体湍流数值模拟方法研究进展综述

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哈尔滨工程大学学报（英文版） 2024年第1期23卷 1-22页

作者：和康健潘治赵伟文王建华万德成 Computational Marine hydrodynamics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Wuhan Second Ship Design and Research Institute Wuhan 430205China

In this paper,we present an overview of numerical simulation methods for the flow around typical underwater vehicles at high Reynolds numbers,which highlights the dominant flow structures in different regions of *** overview covers the forebody,midbody,stern,wake region,and appendages and summarizes flow phenomena,including laminar-to-turbulent transition,turbulent boundary layers,flow under the influence of curvatures,wake interactions,and all associated complex vortex ***,the current issues and challenges of capturing these flow structures are *** overview provides a deep insight into the use of numerical simulation methods,including the Reynolds-averaged Navier–Stokes(RANS)method,large eddy simulation(LES)method,and the hybrid RANS/LES method,and evaluates their applicability in capturing detailed flow features.

关键词： Numerical simulation methods Underwater vehicles Boundary layer transition Turbulent boundary layer Wake Appendages

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Erratum to:A nonlinear wake model of a wind turbine considering the yaw wake steering

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Journal of oceanology and Limnology 2024年第3期42卷 1016-1017页

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基于CFD的具有首翼的新型飞翔形式AUV升力和阻力估计:对阻力极曲线和推力估计的见解

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哈尔滨工程大学学报（英文版） 2024年第2期23卷 352-365页

作者： Faheem Ahmed Xianbo Xiang Haotian Wang Gong Xiang Shaolong Yang School of naval architecture and ocean engineering Huazhong University of Science and Technology1037Luoyu RoadWuhan 430074China State key laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and Technology1037Luoyu RoadWuhan 430074China

To achieve hydrodynamic design excellence in Autonomous Underwater Vehicles(AUVs)largely depends on the accurate prediction of lift and drag *** study presents Computational Fluid Dynamics(CFD)-based lift and drag estimations of a novel torpedo-shaped flight-style AUV with *** horizontal bow-wings are provided to accommodate the electromagnetic arrays used to perform the cable detection and tracking operations near the *** hydrodynamic performance of the AUV due to addition of these horizontal bow-wings is required to be investigated,particularly at the initial design ***,CFD techniques are employed to compute the lift and drag forces observed by the flight-style AUV,maneuvering underwater at different angles of attack and varying *** Reynolds-Averaged Navier-Stokes Equations(RANSE)closure is achieved by employing the modified k-ϵ model and Two-Scale Wall Function(2-SWF)approach is used for boundary layer ***,the study also highlights the unique mesh refinement and solution-adaptive meshing techniques to perform the CFD simulations in Solidworks Flow Simulation(SWFS)*** drag polar curve for flight-style AUV with and without bow-wings is generated using the computed lift and drag *** curve provided essential insights for achieving hydrodynamically efficient and optimized AUV *** the drag polar curve,it is revealed that due to horizontal bow-wings,the flight-style AUV is capable to generate higher lift with less drag and thus,it gives better lift-to-drag ratio compared to the AUV without ***,simulated results of axial drag observed by the AUV have also been compared with free-running experimental results and are found in good agreement.

关键词： Autonomous underwater vehicle(AUV) Computational fluid dynamics(CFD) Solidworks flow simulation(SWFS) Drag polar curve Free-running experiments

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Drawdown mechanism of light particles in baffled stirred tank for the KR desulphurization process

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Chinese Journal of Chemical engineering 2019年第2期27卷 247-256页

作者： Meng Li Yangbo Tan Jianglong Sun De Xie Zeng Liu School of naval architecture and ocean engineering Huazhong University of Science and Technology Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration (CISSE) hubei key laboratory of naval architecture and ocean engineering hydrodynamics (HUST)

To improve the efficiency of the desulfurization process, the drawdown mechanism of light particles in stirred tank is studied in this paper. For both up and down pumping modes, the just drawdown speeds(Njd) of floating particles in transformative Kanbara Reactor(KR) are measured in one and four baffled stirred tanks experimentally. Then numerical simulations with standard k-ε model coupled with volume of fluid model(VOF) and discrete phase model(DPM) are conducted to analyze the flow field at the just drawdown speed Njd. The torques on the impeller obtained from experiments and simulations agree well with each other, which indicates the validity of our numerical simulations. Based on the simulations, three main drawdown mechanisms for floating particles, the axial circulation, turbulent fluctuation and largescale eddies, are analyzed. It's found that the axial circulation dominates the drawdown process at small submergence(S = 1/4 T and 1/3 T) and the large-scale eddies play a major role at large submergence(S = 2/3 T and 3/4 T). Besides, the turbulent fluctuation affects the drawdown process significantly for up pumping mode at small submergence(S = 1/4 T and 1/3 T) and for down pumping mode at large submergence(S = 2/3 T and 3/4 T). This paper helps to provide a more comprehensive understanding of the KR desulphurizer drawdown process in the baffled stirred tank.

关键词： Light particles Drawdown mechanism Baffled stirred tank Submergence Numerical simulations KR impeller

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Run-up of non-breaking double solitary waves with equal wave heights on a plane beach

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Journal of hydrodynamics 2014年第6期26卷 939-950页

作者：董杰王本龙刘桦 School of naval architecture Ocean and Civil Engineering Shanghai Jiao Tong University School of naval architecture Ocean and Civil Engineering MOE Key Laboratory of Hydrodynamics Shanghai Jiao Tong University

The evolution and run-up of double solitary waves on a plane beach were studied numerically using the nonlinear shallow water equations（NSWEs） and the Godunov scheme. The numerical model was validated through comparing the present numerical results with analytical solutions and laboratory measurements available for propagation and run-up of single solitary wave. Two successive solitary waves with equal wave heights and variable separation distance of two crests were used as the incoming wave on the open boundary at the toe of a slope beach. The run-ups of the first wave and the second wave with different separation distances were investigated. It is found that the run-up of the first wave does not change with the separation distance and the run-up of the second wave is affected slightly by the separation distance when the separation distance is gradually shortening. The ratio of the maximum run-up of the second wave to one of the first wave is related to the separation distance as well as wave height and slope. The run-ups of double solitary waves were compared with the linearly superposed results of two individual solitary-wave run-ups. The comparison reveals that linear superposition gives reasonable prediction when the separation distance is large, but it may overestimate the actual run-up when two waves are close.

关键词： run-up double solitary waves nonlinear shallow water equations(NSWEs)

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Numerical investigation of the time-resolved bubble cluster dynamics by using the interface capturing method of multiphase flow approach

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Journal of hydrodynamics 2017年第3期29卷 485-494页

作者：陈瑛鲁传敬陈鑫李杰宫兆新 MOE key laboratory of hydrodynamics School of Naval ArchitectureOcean and Civil EngineeringShanghaiJiao Tong UniversityShanghai 200240China

The present paper proposes a multiphase flow approach for capturing the time-resolved collapse course of bubble clusters in various geometrical *** simulation method is first verified by computing the dynamic behavior of an isolated vapor bubble placed in a uniform ambient *** comparison between the numerical result and the theoretical solution indicates that the method can accurately capture the bubble shape,the characteristic time and the extremely high pressure induced by the *** the simulation method is applied to investigate the behavior of two kinds of bubble clusters in hexagonal and cubic geometrical *** predicted collapsing sequence and the shape characteristics of the bubbles are generally in agreement with the experimental *** bubbles transform and break from the outer layer toward the inner *** each layer,the bubbles on the corner first change into a pea shape and cave before collapsing,then the bubbles on the sides begin to *** is also found that,in comparison with the case of an isolated single bubble,the central bubble in the cluster always contracts more slowly at the early stage and collapses more violently at the final stage.

关键词： Bubble cluster collapse numerical simulation cavitation model

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A random walk simulation of scalar mixing in flows through submerged vegetations

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Journal of hydrodynamics 2014年第3期26卷 343-350页

作者：梁东方 WU Xuefei MOE key laboratory of hydrodynamics School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Department of engineering University of Cambridge

The scalar transport phenomena in vertical two-dimensional flows are studied using the random walk method. The established Lagrangian model is first applied to study the idealized longitudinal dispersion in open channels, before being used to investigate the scalar mixing characteristics of the flows through submerged vegetations. The longitudinal dispersion coefficients of the fully-developed boundary layer flows, with and without vegetations, are calculated based on the positions of the particles. A convenient way of incorporating the effects of vegetations is proposed, where all the flow parameters are regarded to be continually distributed over the depth. The simulation results show high accuracy of the developed random walk method, and indicate that the new method of accounting for the vegetation effects is appropriate for all the test cases considered. The predicted longitudinal dispersion coefficients agree well with the measurements. The merit of the new method is highlighted by its simplicity and efficiency in comparison with the conventional method that assumes the discontinuous distribution of the flow parameters over the depth.

关键词： random walk longitudinal dispersion submerged vegetations scalar mixing

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Role of interstitial flow in tumor migration through 3D ECM

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Acta Mechanica Sinica 2020年第3期36卷 768-774页

作者： Ang Li Ren Sun MOE key laboratory of hydrodynamics School of Naval ArchitectureOcean&Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Cancer invasion in tissue is simultaneously regulated by chemical and mechanical *** suggest that interstitial flow plays a critical role in tumor *** one hand,the distribution of chemokines around cell is influenced by *** the other hand,interstitial flow may reconfigure the alignment of fiber matrix,which greatly changes the contact force between cell and extracellular *** this study,we have upgraded a model by which we can quantitatively investigate the influence of flow on tumor cell migration.A hydrodynamic analysis of shear stress on a slender body is introduced to simulate the fiber *** such as subtle flow and cell-matrix interaction which dominate tumor migration are integrated in this novel *** results show interstitial flow facilitates tumor cell migration in the flow ***,the flow-related chemical and mechanical cues have a synergistic effect on the *** model provides better understanding on cancer metastasis and helps design vitro experiment precisely.

关键词： Interstitial flow Tumor cell migration Extracellular matrix

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