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| 1 | WAVE EQUATION MODEL FOR SHIP WAVES IN BOUNDED SHALLOW WATER显示文摘Ships were modelled as moving pressure disturbances on the free surface of a shallow water basin in the present paper. The moving pressure generating waves were subjected to the reflection of land boundaries and the radiation of open boundaries. This paper proposed and examined a wave equation model (WEM) to solve the shallow water equations with moving surface pressures simulating ship waves in a bounded shallow water region. The Galerkin finite element method was used to solve a second order wave equation for the free surface elevations and the hydrodynamic pressure of the ship bottom simultaneously. Horizontal velocities were obtained from the momentum equations. Numerical solutions of Series 60 C B=0.6 ships moving with the depth Froude number of F h= 0.6, 1.0, 1.3 in a rectangular shallow water harbor were investigated. Three dimensional surface elevation profiles and the depth averaged horizontal velocities were analysed. The numerical results characterised very well the ship waves in shallow water. Strong boundary reflection waves were found in the case of high depth Froude number (F h=1.3). Waves generated by the interactions of two ships moving in the same directions and in the opposite directions were also numerically investigated in the present study. | T.S.Lee Mechanical & Production Engineering Department, National University of Singapore, Singapore 119620 Wu Jian kang, Xiong Chuan guang Mechanics Department of Huazhong University of Science & Technology, Wuhan 430074, P.R.China C.Shu Mechani | 2000 | Journal of Hydrodynamics2000，12，4： | 4 |
| 2 | Two stage intermittent aeration membrane bioreactor for simultaneous organic,nitrogen and phosphorus removal显示文摘 | G.T.Seo T.S.Lee B.H.Moon | | 0，，10： | 1 |
| 3 | Image representation using 2D Gabor wavelets显示文摘 | T.S.Lee | | 0，，10： | 1 |
| 4 | Numerical Study on Sinusoidal Fluctuated Pulsatile Laminar Flow Through Various Constrictions显示文摘Numerical simulations have been carried out for laminar sinusoidal pulsating flow in a tube with smooth single constriction.A second-order finite volume method has been developed to solve the fluid flow governing equations on a nonstaggered non-orthogonal grid.The effects of the Reynolds number,the Womersley number,the pulsatile amplitude,the constriction ratio and the constriction length on fluid flow in constricted tube will be investigated.It will be demonstrated that the dynamic nature of the pulsating flow greatly depends on the frequency of the flow changes.It is observed that the peak wall vorticity seems to increase with the increase of Reynolds number,the pulsating amplitude and the constriction ratio.The peak values of instantaneous wall vorticity are not greatly affected by the variation of Womersly number.The constriction length does not put a significant impact on the flow instantaneous streamline behaviors compared with other parameters.However,the peak wall vorticity increases monotonically with the decrease of the constriction length. | T.S.Lee X.Liu G.C.Li H.T.Low | 2007 | Communications in Computational Physics2007，2，1： | 0 |
| 5 | An Interface-Capturing Method for Resolving Compressible Two-Fluid Flows with General Equation of State显示文摘In this study,a stable and robust interface-capturing method is developed to resolve inviscid,compressible two-fluid flows with general equation of state(EOS).The governing equations consist of mass conservation equation for each fluid,momentum and energy equations for mixture and an advection equation for volume fraction of one fluid component.Assumption of pressure equilibrium across an interface is used to close the model system.MUSCL-Hancock scheme is extended to construct input states for Riemann problems,whose solutions are calculated using generalized HLLC approximate Riemann solver.Adaptive mesh refinement(AMR)capability is built into hydrodynamic code.The resulting method has some advantages.First,it is very stable and robust,as the advection equation is handled properly.Second,general equation of state can model more materials than simple EOSs such as ideal and stiffened gas EOSs for example.In addition,AMR enables us to properly resolve flow features at disparate scales.Finally,this method is quite simple,time-efficient and easy to implement. | T.S.Lee J.G.Zheng S.H.Winoto | 2009 | Communications in Computational Physics2009，6，10： | 0 |
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