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【期刊论文】Application of A Fast Multipole BIEM for Flow Diffraction from A 3D Body*
滕斌, TENG Bin and NING De-zhi
China Ocean Engineering, Vol. 18, No.2, pp. 291-298,-0001,():
-1年11月30日
A Fast Melipole Mechod (FMM) is developed as nurnerical approach to the reduction of tile computauorai cost and requirement memory capacity for a large in solving large-scale problems. In this paper it is applied to the boundary integral equation method (BIEM) for current diffraction from arbitrary 3D bodies. The boundary integral equation is dis-crotized by higher order elements, the FMM is applied to avoid the matrix/vector product, and the resulting algebraic e-quatiun is solved by the Generalized Conjugate Residual method (GCR). Numerical examination shows that the FMM is more efficient than the direct evaluation method in computational cost and storage of computers.
fast multipole method, boundary integral equation method, generalized conjugate residual method, current diffraction
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【期刊论文】Second-Order Wave Diffraction Around 3-D Bodies by A Time-Domain Method*
滕斌, BAI Wei and TENG Bin
China Ocean Engineering, Vo1. 15, No.1, PP. 73-84,-0001,():
-1年11月30日
A time-domain method is applied to simulate nonlinear wave diffraction around a surface piercing 3-D arbitrary body. The method involves the application of Taylor series expansions and the use of perturbation procedure to estab-lish the corresponding boundary value problems with respect to a time-independent fluid domain. A boundary element method based on B-spline expansion is used to calculate the wave field at each time step, and the free surface boundary condition is satisfied to the second order of wave steepness by a numerical integration in time. An artificial damping lay-er is adopted on the free surface for the removal of wave reflection from the outer boundary. As an illustration, the meth-od is used to compute the second-order wave forces and runup on a surface-piercing circular cylinder. The present method is found to be accurate, computationally efficient, and numerically stable.
time-domain method, boundary element method, wave forces
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【期刊论文】NUMERICAL SIMULATION OF WAVE-INDUCED LOCAL SCOUR AROUND A LARGE CYLINDER
滕斌, M. ZHAO and B. TENG, L. CHENG*
Coastal Engineering Journal, Vol. 46, No.3(2004)291-314,-0001,():
-1年11月30日
A horizontal two-dimensional finite element model is developed in order to estimate the process of scour around a large-scale cylinder due to waves. The present model differs from previous models in the sense that the wave model is based on an elliptic mild slope equation and the sediment transport induced by the steady streaming is considered. The current induced by the gradient of radiation stress is considered and calculated using a depth integrated shallow water equation. The contributions of the Lagrangian drift velocity to the scour is also considered in this model. The model is validated against a few cases where experimental data are available. The comparison of the calculation results with the experimental data indicates that the present numerical model predicts the scour around a large cylinder reasonably well. The effects of Keulegan-Capenter (KC) number, the grain size of sediments and the model scale on scour around a large cylinder are also investigated.
Scour, wave, sediment transport, large cylinder, numerical simulation, wave diffraction.,
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【期刊论文】Numerical Examination of Third-order Wave Force on Axisymmetric Bodies
滕斌, Bin Teng* and Guohai Dong
Vol. 11, No.4, December 2001 (ISSN 1053-5381),-0001,():
-1年11月30日
Within the frame of potential theory and the assumption of weak nonlinearity of wave motion, a numerical method is developed for the third-order triple-frequency wave loads on fixed axisymmetric bodies in monochromatic incident waves. Applying the numerical code, numerical computations were carried out for surge and heave forces and pitch moments on a uniform cylinder, truncated cylinders and a hemisphere. Examinations were made of the contribution to third-order forces and moments from potentials at each wave order, and the relation of third-order forces and moments to wave number and drafts of cylinders.
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【期刊论文】Simulation of Fully Nonlinear 3-D Numerical Wave Tank*
滕斌, ZHANG Xiao-tu, TENGBin, and NING De-zhi
China Ocean Engineering, Vol. 18, No.1, pp. 59-68,-0001,():
-1年11月30日
A fully nunlinear numerical wave tank (NWT) has been simulated by use of a three dimensional higher order boundary element method (HOBEM) in the time domain. Within the frame of potential flow and the adoption of simply Rankine source, the resulting boundary integral equation is repeatedly solved at each time step and the fully nonlinear free surface boundary conditions are integrated with time to update its position and boundary values. A smooth technique is also adopted in order to eliminate the possible saw tooth numerical instabilities. The incident wave at the uptank is given as theoretical wave in this paper. The outgoing waves are absorbed inside a damping zone by spatially varying artificial damping on the free surface at the wave tank end. The numerical results show that the NWT developed by these ap proaches has a high accuracy and good numerical stability.
numerical wave tank, full nonlinearity, higher order boundary element method, three dimensional time domain
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