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水动力学研究与进展B辑
水动力学研究与进展B辑

周连第

双月刊

1001-6058

jhdzhou@yahoo.com.cn

021-63150072

200011

上海高雄路185号

水动力学研究与进展B辑/Journal Journal of HydrodynamicsCSCDCSTPCDEISCI
查看更多>>本刊主要刊载能源开发、海洋工程、水利工程、机械工程等方面，有关物理模型、数值模拟、试验研究、试验技术新成果以及学科介绍等文章。
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    Effect of the yaw angle on turbulent flow structures around the submarine model

    Yi-jing HuYi QuQin WuBiao Huang...
    421-434页
    查看更多>>摘要：The objective of this paper is to investigate the turbulent flow structures around the submarine model and evaluate the effect of the yaw angle on the turbulent flow characteristics.The large eddy simulation based on the boundary data immersion method is used to investigate.The computational domain consists of 1.2x 108 uniformly distributed Cartesian orthogonal grid nodes to capture the basic flow characteristics around the model.The pressure coefficient,friction coefficient and wake velocity distribution are in good agreement with the experimental data.Three different types of vortex structures were mainly captured around the model,including horseshoe vortex,sail tip vortex and crossflow separation vortex.With the increase of the yaw angle,the asymmetry of the horseshoe vortex and the tip vortex gradually increases,and the vortex strength of the vortex leg on the windward of the horseshoe vortex and the vortex strength of the tip vortex also increase gradually.For the crossflow separation vortex,the flow separation zone gradually expands and migrates downstream with the increase of the yaw angle.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Energy partition in laser-induced cavitation bubbles near the rigid wall with a gas-containing hole

    Dong-qiao HeHai-gang WenSi-yuan GengChen-xi Yang...
    435-443页
    查看更多>>摘要：To investigate the energy partition in laser-induced cavitation bubbles near the rigid wall with a gas-containing hole,we utilized a nanosecond resolution photography system based on a Q-switched Nd∶YAG laser and conventional industrial camera to carefully observe the transient process of bubble collapse near the rigid wall with a gas-containing hole.We analyzed the generation of collapse microjets and the emission of collapse shock waves.We found that the cavitation bubble near the rigid wall with a gas-containing hole collapsed at different times and space,and produced various types of shock waves.Based on the far field pressure information of the shock waves measured by hydrophone,the energy of the shock waves generated by the bubble collapse near the rigid wall with a gas-containing hole is calculated for the first time.The results show that the ratio of collapse shock wave energy to bubble energy is approximately between 0.7 and 0.8.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Jetting of a near-wall cavitation bubble induced by another tandem bubble

    Hui HanJing-zhu WangJian-lin HuangPeng-bo Bai...
    444-456页
    查看更多>>摘要：Double bubbles near a rigid wall surface collapse to produce a significant jet impact,with potential applications in surface cleaning and ultrasonic lithotripsy.However,the dynamic behaviors of near-wall bubbles remain unexplored.In this study,we investigate the jetting of a near-wall bubble induced by another tandem bubble.We define two dimensionless standoff distances,y1,γ2,to represent the distances from the center of the near-wall bubble to the rigid wall and the center of controlling bubble to the center of the near-wall bubble,respectively.Our observations reveal three distinct jetting regimes for the near-wall bubble:transferred jetting,double jetting,and directed jetting.To further investigate the jetting mechanism,numerical simulations are conducted using the compressibleInterFoam solver in the open-source framework of OpenFOAM.A detailed analysis shows that the transferred jet flow is caused by the pinch-off resulting from the axial contraction velocity at the lower end of the near-wall bubble being greater than the vertical contraction velocity,leading to a maximum jet velocity of 682.58 m/s.In the case of double jetting,intense stretching between the controlling bubble and the wall leads to a pinch-off and a double jetting with a maximum velocity of 1 096.29 m/s.The directed jet flow is caused by the downward movement of the high-pressure region generated by the premature collapse of the controlling bubble,with the maximum jet velocitv reaching 444.62 m/s.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Numerical analysis of coupled sloshing and motion of a cylindrical FPSO in regular waves

    Wei-wen ZhaoXiao-long YangDe-cheng Wan
    457-465页
    查看更多>>摘要：In this paper,the coupled sloshing and motion characteristics of a cylindrical floating production storage offloading(CFPSO)are numerically investigated by means of computational fluid dynamics(CFD)tool.The simulations are performed using an in-house CFD solver naoe-FOAM-SJTU which is developed based on OpenFOAM.The active wave generating-absorbing boundary condition(GABC)is utilized for wave generation and absorption.The stabilized k-omega SST turbulence model are used to avoid excessive eddy viscosity near the free surface.CFPSO with and without partially filled liquid tanks in regular waves with different wave periods are simulated and vertical planar motions such as surge,heave and pitch response amplitude operators(RAOs)are compared.Forces due to liquid sloshing and wave loads are extracted and analyzed.The free surface motions inside liquid tanks in one wave period presented to explain the motion characteristics.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Automated regression test method for scientific computing libraries:Illustra-tion with SPHinXsys

    Bo ZhangChi ZhangXiangyu Hu
    466-478页
    查看更多>>摘要：Scientific computing libraries,whether in-house or open-source,have witnessed enormous progress in both engineering and scientific research.Therefore,it is important to ensure that modifications to the source code,prompted by bug fixing or new feature development,do not compromise the accuracy and functionality that have been already validated and verifiied.This paper introduces a method for establishing and implementing an automatic regression test environment,using the open-source multi-physics library SPHinXsys as an illustrative example.Initially,a reference database for each benchmark test is generated from observed data across multiple executions.This comprehensive database encapsulates the maximum variation range of metrics for different strategies,including the time-averaged,ensemble-averaged,and dynamic time warping methods.It accounts for uncertainties arising from parallel computing,particle relaxation,physical instabilities,and more.Subsequently,new results obtained after source code modifications undergo testing based on a curve-similarity comparison against the reference database.Whenever the source code is updated,the regression test is automatically executed for all test cases,providing a comprehensive assessment of the validity of the current results.This regression test environment has been successfully implemented in all dynamic test cases within SPHinXsys,including fluid dynamics,solid mechanics,fluid-structure interaction,thermal and mass diffusion,reaction-diffusion,and their multi-physics couplings,and demonstrates robust capabilities in testing different problems.It is noted that while the current test environment is built and implemented for a particular scientifiic computing library,its underlying principles are generic and can be easily adapted for use with other libraries,achieving equal effectiveness.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Numerical analysis of a projecting wall type oscillating water column(PW-OWC)wave energy converter in regular waves

    Lei TanRuiyuan ChangTomoki Ikoma
    479-491页
    查看更多>>摘要：Oscillating water column(OWC)based wave energy absorption devices are classic which have been widely used for harnessing ocean wave energy.This paper presents a numerical study on a projecting wall(PW)type OWC wave energy converter in regular waves.The computational fluid dynamics(CFD)modelling of a stationary floating PW-OWC model in a three-dimensional wave flume is achieved by the software Flow-3D.Numerical analyses are carried out based on CFD simulations and the linear potential flow solutions with modifications to account for turbine-induced damping.The present numerical solutions are validated against our previous experimental data.It is found that both the CFD and modified linear potential flow predictions are in reasonably good agreements with the experimental data in the first order results of OWC and air pressure responses.When the nonlinear responses are included in the result,the modified linear potential flow solution is found to slightly under-estimate the wave energy conversion performance at long wavelengths.Regarding the airflows above and below the chamber orifice,the CFD results suggest that they are almost unidirectional,oscillating in not only the base frequency but also subharmonic and ultraharmonic frequencies.The evolution of the OWC responses during an entire period and the phase analysis based on CFD simulations are presented.The phase results provide the crucial evidence to the reasonability of the physics-based modification of the potential flow model in modelling of OWCs.The present results and analysis are expected to be beneficial to the understanding on the physical mechanism of OWCs and the design of phase control strategies.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Experimental and numerical analysis of multi-chamber oscillating water column devices

    Jorge GadelhoKourosh RezanejadC.Guedes Soares
    492-503页
    查看更多>>摘要：A review of multi-chamber oscillating water column(OWC)device designs is presented.Two significant variations of these devices are discussed,onshore OWC(OOWC)and a floating OWC(FOWC).The efficiency results of several theoretical studies based on low-and high-fidelity numerical models are presented and compared with the model scale results.Generally,low-fidelity numerical models are very fast to run,but their accuracy is limited compared with high-fidelity numerical models.Scaled model experiments usually give results much more accurate than numerical models,but they need adequate facilities and are very expensive.In the case of the OOWC,all models show a similar trend of total efficiency,but while the analytical model shows a maximum value of around 90％efficiency,the CFD model shows 60％,and the experiments only go up to 40％.The main reason is connected with the mathematical simplifications and assumptions that do not represent all the hydrodynamic and aerodynamic processes between the water,air,and structure.For the case of the FOWC,interestingly,the experimental results show a maximum efficiency of almost 100％,while the analytical model only predicts a maximum of 80％.The efficiency seems highly dependent on the heave motion resonance of the entire device,where the analytical model fails to predict this natural frequency.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Fast prediction of rain erosion in wind turbine blades using a data-based computational tool

    Juan M.GimenezSergio R.IdelsohnEugenio O?ate
    504-518页
    查看更多>>摘要：Wind turbines(WTs)face a high risk of failure due to environmental factors like erosion,particularly in high-precipitation areas and offshore scenarios.In this paper we introduce a novel computational tool for the fast prediction of rain erosion damage on WT blades that is useful in operation and maintenance decision making tasks.The approach is as follows:Pseudo-Direct Numerical Simulation(P-DNS)simulations of the droplet-laden flow around the blade section profile are employed to build a high-fidelity data set of impact statistics for potential operating conditions.Using this database as training data,a machine learning-based surrogate model provides the feature of the impact pattern over the 2-D section for given wind and rain conditions.With this information,a fatigue-based model estimates the remaining lifetime and erosion damage for both homogeneous and coating-substrate blade materials.This prediction is done by quantifying the accumulated droplet impact energy and evaluating operative conditions over time periods for which the weather at the installation site is known.In this work,we describe the modules that compose the prediction method,namely the database creation,the training of the surrogate model and their coupling to build the prediction tool.Then,the method is applied to predict the remaining lifetime and erosion damage to the blade sections of a reference WT.To evaluate the reliability of the tool,several site locations(offshore,coastal,and inland),the coating material and the coating thickness of the blade are investigated.In few minutes we are able to estimate erosion after many years of operation.The results are in good agreement with field observations,showing the promise of the new rain erosion prediction approach.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Numerical investigation on compressible flow around a cylinder in proximity to the heated wall

    Yu-lu LiuJun-wang QuYi-zhou TaoYong-guang Lyu...
    519-533页
    查看更多>>摘要：In this study,direct numerical simulations were conducted to investigate the compressible flow around a circular cylinder near a heated wall at a Reynolds number(Re)of 500 and a Mach number(Ma)of 0.4.The heating ratio T*ranging from 1.0 to 1.6 represents the different situations of a heated wall,whereas the gap ratio ranges from 0.3 to 1.0.This study analyzed the impact of heating effect and wall proximity on flow characteristics and aerodynamic forces.The results indicated that the stability of the flow was enhanced as the gap ratio decreased or the heating ratio increased.Through the calculation of enstrophy,it was found that the strength of shedding vortices weakens with a decrease in gap ratio or an increase in heating ratio.Furthermore,the mean drag coefficient decreases as the heating ratio increases or the gap ratio decreases.In contrast,the mean lift coefficient initially decreases and then increases as the gap ratio decreases.Finally,the drag reduction mechanism was analyzed by examining the pressure distribution on the surface of the cylinder.
      原文链接:
    • NETL
    • NSTL
    • 万方数据

    Predicting submerged vegetation drag with a machine learning-based method

    Meng-yang LiuHong-wu TangSai-yu YuanJing Yan...
    534-545页
    查看更多>>摘要：Accurate estimation of the drag forces generated by vegetation stems is crucial for the comprehensive assessment of the impact of aquatic vegetation on hydrodynamic processes in aquatic environments.The coupling relationship between vegetation layer flow velocity and vegetation drag makes precise prediction of submerged vegetation drag forces particularly challenging.The present study utilized published data on submerged vegetation drag force measurements and employed a genetic programming(GP)algorithm,a machine learning technique,to establish the connection between submerged vegetation drag forces and flow and vegetation parameters.When using the bulk velocity,U,as the reference velocity scale to define the drag coefficient,Cd,and stem Reynolds number,the GP runs revealed that the drag coefficient of submerged vegetation is related to submergence ratio(H*),aspect ratio(d*),blockage ratio(Ψ),and vegetation density(λ).The relation between vegetation stem drag forces and flow velocity is implicitly embedded in the definition of Cd.Comparisons with experimental drag force measurements indicate that using the bulk velocity as the reference velocity,as opposed to using the vegetation layer average velocity,Uv,eliminates the need for complex iterative processes to estimate Uv and avoids introducing additional errors associated with Uv estimation.This approach significantly enhances the model's predictive capabilities and results in a simpler and more user-friendly formula expression.
      原文链接:
    • NETL
    • NSTL
    • 万方数据