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| 1 | Full time-domain nonlinear coupled dynamic analysis of a truss spar and its mooring/riser system in irregular wave显示文摘A new full time-domain nonlinear coupled method has been established and then applied to predict the responses of a Truss Spar in irregular wave.For the coupled analysis,a second-order time-domain approach is developed to calculate the wave forces,and a finite element model based on rod theory is established in three dimensions in a global coordinate system.In numerical implementation,the higher-order boundary element method(HOBEM)is employed to solve the velocity potential,and the 4th-order Adams-Bashforth-Moultn scheme is used to update the second-order wave surface.In deriving convergent solutions,the hull displacements and mooring tensions are kept consistent at the fairlead and the motion equations of platform and mooring-lines/risers are solved simultaneously using Newmark-integration scheme including Newton-Raphson iteration.Both the coupled quasi-static analysis and the coupled dynamic analysis are performed.The numerical simulation results are also compared with the model test results,and they coincide very well as a whole.The slow-drift responses can be clearly observed in the time histories of displacements and mooring tensions.Some important characteristics of the coupled responses are concluded. | YANG MinDong TENG Bin XIAO LongFei NING DeZhi SHI ZhongMin QU Yan | 2014 | Science China(Physics,Mechanics & Astronomy)2014，57，1： | 8 |
| 2 | Numerical study of resonance induced by wave action on multiple rectangular boxes with narrow gaps显示文摘By introducing a source term into the Laplace equation, a two-dimensional fully nonlinear time-domain numerical wave flume(NWF) is developed to investigate the resonance induced by the interaction between waves and multiple objects with narrow gaps. In the numerical model, the fully nonlinear kinematic and dynamic boundary conditions are satisfied on the instantaneous free surface and the constant artificial damping is employed in the gaps to approximate the viscous dissipation due to vortex motion and flow separation. The computational domain is discretized using a higher-order boundary element method(HOBEM). The proposed model is firstly validated against the published experimental data and numerical results of the wave height in the narrow gap between two boxes, the wave heights in the two gaps of three boxes, and wave loads on the boxes.Then, the extensive numerical experiments are performed to study the influences of the number of the boxes and the gap spacing on the resonant frequency, reflected and transmitted wave heights and wave loads on the boxes. | NING Dezhi SU Xiaojie ZHAO Ming TENG Bin | 2015 | Acta Oceanologica Sinica2015，34，5： | 5 |
| 3 | Numerical investigation of influence of wave directionality on the water resonance at a narrow gap between two rectangular barges显示文摘A three-dimensional time-domain potential flow model with second-order nonlinearity was applied to simulate the wave resonance in a gap between two side-by-side rectangular barges. In the model, the velocity potential was decomposed into the incident potential and unknown scattered potential which was obtained by solving the boundary integral equation. The fourth-order predict-correct method was applied to enforce the free surface conditions in the time integration. The influence of the wave direction on the first and second-order gap surface elevations was investigated. The results reveal that the incident wave angle does not affect the resonant wave frequency and the maximum surface elevation at resonance always occurs at the middle location along the gap.However, the corresponding maximum wave surface elevation at resonance varies with the incident wave angle.The location of the maximum wave elevation shifts either upstream or downstream along the gap, depending on the relative magnitude of incident wave frequency to the resonant frequency. | JIN Ruijia TENG Bin NING Dezhi ZHAO Ming CHENG Liang | 2017 | Acta Oceanologica Sinica2017，36，6： | 3 |
| 4 | Numerical investigation of solitary wave action on tworectangular boxes with a narrow gap显示文摘Based on the time-domain higher-order boundary element method(HOBEM), a two-dimensional numerical wave flume is developed to investigate solitary wave interaction with two rectangular boxes with a narrow gap.In the numerical model, the fully nonlinear boundary conditions are satisfied on the free surface, the mixed Eulerian-Lagrangian method is adopted to track the transient water surface and the fourth-order Runga-Kutta method is used to predict the velocity potential and wave elevation on the free surface. The acceleration potential technique is used to compute the transient wave forces along the wetted object surface. A piston-type wavemaker is used to generate solitary waves. The proposed model is validated by comparing the simulated wave run-up and the wave loads with the published experimental and numerical results of the reflection of a solitary wave from a vertical wall. Then, numerical experiments are performed to study the effects of the narrow gap and the size of each box on the wave run-ups at the two sides of the two-box system and in the narrow gap between two boxes, and the wave loads on the two boxes. The interaction between double solitary waves with a time interval between them with a two-box system is also investigated. | NING Dezhi SU Xiaojie ZHAO Ming | 2016 | Acta Oceanologica Sinica2016，35，12： | 2 |
| 5 | Simulation of fully nonlinear 3-D numerical wave tank显示文摘 | Zhang Xiaotu Teng Bin Ning Dezhi | 2004 | China Ocean Engineering2004，18，： | 1 |
| 6 | Correlation of dose computed using different algorithms with local control following stereotactic ablative radiotherapy (SABR)-based treatment of non-small-cell lung cancer显示文摘 | Indrin J. Chetty Suneetha Devpura Dezhi Liu Daiquan Chen Haisen Li Ning (Winston) Wen Sanath Kumar Correen Fraser M. Salim Siddiqui Munther Ajlouni Benjamin Movsas | 2013 | Radiotherapy and Oncology2013，，3： | 1 |
| 7 | Nonlinear numerical simulation on extreme-wave kine-matics显示文摘A fully nonlinear numerical model based on a time-domain higher-order boundary element method (HOBEM) is founded to simulate the kinematics of extreme waves. In the model, the fully nonlinear free surface boundary conditions are satisfied and a semi-mixed Euler-Lagrange method is used to track free surface; a fourth-order Runga-Kutta technique is adopted to refresh the wave elevation and velocity potential on the free surface at each time step; an image Green function is used in the numerical wave tank so that the integrations on the lateral surfaces and bottom are excluded. The extreme waves are generated by the method of wave focusing. The physical experiments are carried out in a wave flume. On the horizontal velocity of the measured point, numerical solutions agree well with experimental results. The characteristics of the nonlinear extreme-wave kinematics and the velocity distribution are studied here. | NING Dezhi TENG Bin LIU Shuxue | 2009 | Acta Oceanologica Sinica2009，28，3： | 1 |
| 8 | Numerical modelling of nonlinear extreme waves in presence of wind显示文摘A numerical wave flume with fully nonlinear free surface boundary conditions is adopted to investigate the temporal characteristics of extreme waves in the presence of wind at various speeds. Incident wave trains are numerically generated by a piston-type wave maker, and the wind-excited pressure is introduced into dynamic boundary conditions using a pressure distribution over steep crests, as defined by Jeffreys' sheltering mechanism.A boundary value problem is solved by a higher-order boundary element method(HOBEM) and a mixed Eulerian-Lagrangian time marching scheme. The proposed model is validated through comparison with published experimental data from a focused wave group. The influence of wind on extreme wave properties,including maximum extreme wave crest, focal position shift, and spectrum evolution, is also studied. To consider the effects of the wind-driven currents on a wave evolution, the simulations assume a uniform current over varying water depth. The results show that wind causes weak increases in the extreme wave crest, and makes the nonlinear energy transfer non-reversible in the focusing and defocusing processes. The numerical results also provide a comparison to demonstrate the shifts at focal points, considering the combined effects of the winds and the wind-driven currents. | NING Dezhi DU Jun BAI Wei ZHANG Chongwei TENG Bin | 2018 | Acta Oceanologica Sinica2018，37，9： | 1 |
| 9 | Nonlinear Simulation of Focused Wave Group Action on a Truncated Surface-Piercing Structure显示文摘In this study, we numerically investigated the nonlinear focused wave group action on a truncated surface-piercing structure, and developed a two-dimensional fully nonlinear numerical tank using the higher-order boundary element method. We determined the amplitude of the wave components of the focused wave group based on the JONSWAP wave spectrum. We discuss the effects of the presence of a surface-piercing structure on the characteristics of the focused wave group and find that the location of the structure does not evidently change the focal location or focal time of the focused wave group. The largest amplitudes of the run-up and horizontal force on the structure occur when the front surface of the structure is at the focal location. The critical draught and breadth of the structure occur when the wave run-up reaches its maximum along the structure. | Dezhi Ning Xiang Li Chongwei Zhang | 2018 | Journal of Marine Science and Application2018，17，3： | 1 |
| 10 | 32nd International Workshop on Water Waves and Floating Bodies(IWWWFB2017)显示文摘The Thirty-Second Workshop on Water Waves and Floating Bodies was held in Dalian from April23-26,2017,and hosted by State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology(DUT).IWWWFB2017 attracts over90 participants from 17 countries,in which 65participants from abroad.57 papers were selected by the technical committee for presentation on the workshop and included in the proceeding from | Dezhi Ning Bin Teng | 2017 | Journal of Hydrodynamics2017，29，5： | 0 |
| 11 | The influence of up-wave barge motion on the water resonance at a narrow gap between two rectangular barges underwaves in the sea显示文摘A three-dimensional time-domain potential flow model is developed and applied to simulate the wave resonance in a gap between two side-by-side rectangular barges. A fourth-order predict-correct method is implemented to update free surface boundary conditions. The response of an up-wave barge is predicted by solving the motion equation with the Newmark-β method. Following the validation of the developed numerical model for wave radiation and diffraction around two side-by-side barges, the influence of up-wave barge motion on the gap surfaceresonance is investigated in two different locations of the up-wave barge relative to the back-wave barge at various frequencies. The results reveal that the freely floating up-wave barge significantly influences the resonance frequency and the resonance wave amplitude. Simultaneously, the up-wave barge located in the middle of the back-wave barge leads to a reduction in the resonance wave amplitude and motion response when compared with other configurations. | JIN Ruijia NING Dezhi BAI Wei GENG Baolei | 2018 | Acta Oceanologica Sinica2018，37，11： | 0 |
| 12 | Pituitary deficiency due to primary pituitary apoplexy显示文摘To the editor:Primary pituitary apoplexy (PA) has few been reported in the cases of adolescents by any English publication.Unlike the secondary PA,primary PA often occurs in patients with pituitary tumor.It is rare and subclinical.Here we report an extremely rare case of chronic primary PA.The patient developed pituitary deficiency with symptoms like delay of puberty and low level of hormone.Therefore,we present the hormone characteristics,imaging findings and the briefly review other literature. | Qu Haibo Ning Gang Guo Yingkun Mu Dezhi | 2014 | Chinese Medical Journal2014，，11： | 0 |
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