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| 1 | CFD Analysis of Ship-to-Ship Hydrodynamic Interaction显示文摘A numerical study of ship-to-ship interaction forces is performed using a commercial CFD code,and the results are compared with experimental data and with the results of a panel method analysis.Two ship models have been used in the interaction forces analysis:a tug and a tanker,advancing parallel to each other with different lateral distances and two different values of the fluid depth.Computations are carried out with four different flow models:inviscid and viscous flow with the free surface modeled as a rigid wall and inviscid and viscous flow with the deformable free surface.A fair agreement was obtained with available experimental data and results obtained by panel method.The influence of viscosity in the computations is found to be comparatively weak,while the wavemaking effects may be important,at small magnitude of the horizontal clearance. | A.D.Wnek Serge Sutulo C.Guedes Soares | 2018 | Journal of Marine Science and Application2018，17，1： | 2 |
| 2 | ON HYDRODYNAMIC INTERACTION UPON THE WAVE FORCES ON VERTICAL PILE ARRAY显示文摘A systematic study is carried out on the hydrodynamic interaction of sin-gle-row vertical pile array with a large number of piles by using the method of wave sourcedistribution.Some new properties for the hydrodynamic interaction among piles are firstreported in this paper.The Present study shows the importance and necessity of reassess-ing the hydrodynamic interaction among multiple objects of large number to reach a com-plete understanding on that subject. | Miao Guo-ping, Yu Zhi-xingDept. of Naval Architecture and Ocean Engineering, Shanghai Jiaotong Univ. , Shanghai200030, P. R. ChinaMiao Quan-mingChina Ship Scientific Research Center, Wuxi 214082, P. R.ChinaLiu Ying-zhong, Zhang Huai-xinDept. of Naval Architecture and Ocean Engineering, Shanghai Jiaotong Univ. , Shanghai200030, P.R.China | 1998 | Journal of Hydrodynamics1998，10，3： | 1 |
| 3 | Experimental Study on Ship-Bank Interaction of Very Large Crude Carrier in Shallow Water显示文摘In order to assess the influence of ship-bank interaction on ship manoeuvring motion, planar motion mechanism(PMM) tests on a scale model of the KRISO very large crude carrier(KVLCC2) are conducted in different water depths in circulating water channel(CWC). The asymmetric hydrodynamic derivatives are defined to characterize the bank effect, and they are measured through the straight towing test with varying lateral displacements. The linear and nonlinear hydrodynamic derivatives are determined from the test data of the Fourier integral and mathematical regression model. The rudder and heading angles required at equilibrium conditions in different ship-bank distances are calculated by the manoeuvring model. The directional stability with varying ship-bank distances is studied in terms of eigenvalue analysis. Analysis based on the test results shows that the KVLCC2 model ship appears inherently unstable for keeping course in deep and shallow water conditions. When the ship-bank distance decreases, the increasing ship-bank interaction can dramatically affect some parameters of the criteria for course keeping. | 刘晗 马宁 顾解忡 | 2018 | Journal of Shanghai Jiaotong university(Science)2018，23，6： | 1 |
| 4 | 浸没在水中的海洋运载器数值模拟研究(英文)显示文摘This article presents a numerical study of the forces induced by hydrodynamic impact, that is, the impact of a part of the bottom of the hull on the water surface. The prediction of these efforts is often based on numerical simulations to determine the shock intensity of a structure on the surface of a weakly compressible fluid (for example, water). The short duration of the impact is also investigated in this work. This phenomenon occurs especially when a ship encounters a harsh and difficult sea conditions. Under such conditions, it is important to know how to predict the hydrodynamic forces applied to the structure to correctly optimize the ship elements during its design stage or to prevent possible damage. Indeed, various factors such as speed of the ship and height of the swell can cause the hull to partially emerge and then fall violently onto the water surface, which is referred to by naval personnel as tossing or slamming causing vibrations, stresses, and fatigue to the structural elements of the ship. In this work, we present an example of phenomenon modeling and then a numerical study of the different geometries (dihedron) that play a role in different sections of the bow. Then, we compare our present results with the theoretical and experimental results of other researchers in the field. The average interval impact time for a dihedral model corresponding to the section of the chosen ship and other experimental and theoretical data is in good agreement with the experimental and theoretical measurements. | Benamar Derrar Benameur Hamoudi Mohammed El-Amine Dris Fethi Saidi | 2019 | Journal of Marine Science and Application2019，18，3： | 0 |
| 5 | A generic approach to the dynamical interpretation of ocean-atmosphere processes显示文摘This paper summarizes the recent development of a portable self-contained system to unravel the intricate multiscale dynamical processes from real oceanic flows, which are in nature highly nonlinear and intermittent in space and time. Of particular focus are the interactions among largescale, mesoscale, and submesoscale processes.We firsu introduce the concept of scale window, and an orthogonal subspace decomposition technigue called multiscale window transform (MWT). Established on MWT is a rigorous formalism of multiscale transport, perfect transfer, and multiscale conversion, which makes a new methodology, multiscale energy and vorticity analysis (MS-EVA). A direct application of the MS-EVA is the development of a novel localized instability analysis, generalizing the classical notion of hydrodynamic instability to finite amplitude processes on irregularly variable domains. The theory is consistent with the analytical solutions of Eady's model and Kuo's model, the benchmark models of baroclinic instability and barotropic instability; it is further validated with a vortex shedding control problem. We have put it to application with a variety of complicated real ocean problems, which would be otherwise very difficult, if not impossible, to tackle. Briefly shown in this paper include the dynamical studies of a highly variable open ocean front, and a complex coastal ocean circulation. In the former, it is found that underlying the frontal meandering is a convective instability followed by an absolute instability, and correspondingly a rapid spatially amplifying mode locked into a temporally growing mode; in the latter, we see a real ocean example of how upwelling can be driven by winds through nonlinear instability, and how winds may excite the ocean via an avenue which is distinctly different from the classical paradigms. This system is mathematically rigorous, physically robust, and practically straightforward. | X. San Liang | 2008 | Acta Oceanologica Sinica2008，27，z1： | 0 |
| 6 | Dramatic change of the self-diffusions of colloidal ellipsoids by hydrodynamic interactions in narrow channels显示文摘The self-diffusion problem of Brownian particles under the constraint of quasi-one-dimensional(q1 D) channel has raised wide concern.The hydrodynamic interaction(HI) plays an important role in many practical problems and two-body interactions remain dominant under q1D constraint.We measure the diffusion coefficient of individual ellipsoid when two ellipsoidal particles are close to each other by video-microscopy measurement.Meanwhile, we obtain the numerical simulation results of diffusion coefficient using finite element software.We find that the self-diffusion coefficient of the ellipsoid decreases exponentially with the decrease of their mutual distance X when X < X0, where X0 is the maximum distance of the ellipsoids to maintain their mutual influence, X0 and the variation rate are related to the aspect ratio p = a/b.The mean squared displacement(MSD) of the ellipsoids indicates that the self-diffusion appears as a crossover region, in which the diffusion coefficient increases as the time increases in the intermediate time regime, which is proven to be caused by the spatial variations affected by the hydrodynamic interactions.These findings indicate that hydrodynamic interaction can significantly affect the self-diffusion behavior of adjacent particles and has important implications to the research of microfluidic problems in blood vessels and bones, drug delivery, and lab-on-chip. | 李瀚海 郑中玉 谢天 王育人 | 2019 | Chinese Physics B2019，28，7： | 0 |
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