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原文传递 Computation of Multi-Body Hydrodynamic Interaction Effects in Waves

论文题名：	Computation of Multi-Body Hydrodynamic Interaction Effects in Waves
关键词：	潜水艇;水动力系数;三维面元法;海洋底部;波浪载荷;Hydrostar软件
摘要：	During recent years, there has been a tremendous development to investigate hydrodynamic interaction between multiple bodies in waves, both theoretically as well as experimentally. Several theoretical methods have been presented and experimental research in this area has also made a great progress. However since the model experiments are expensive to carry out, there is always a need to develop some robust numerical tools to study complex hydrodynamic behavior of multiple bodies in close proximity. Presence of multiple bodies in close proximity can results in attractive and repulsive forces and can cause large wave kinematics.Present research work is aimed to investigate the complex hydrodynamic interacions between multiple bodies. This includes computations for multiple floating bodies as well as for submerged bodies. Special emphasis paid is toaccurately predict second order mean drift loads which are very important and critical for offshore structures. Software used is Hydrostar, which is based on 3-D panel method. Greens theorem is used to solve directly for the velocity potentialon each panel. 　　 Moreover, a new method is proposed to employ multi-body hydrodynamic interaction technique using frequency domain free surface Green function to predict the side-wall interference effects on the results of experiments in towing tank. The walls of the tank being treated as two separate bodies. So the complex numerical computation to formulate a Green function to satisfy tank wall boundary condition can be avoided. Similarly the proposed method can also be employed to account for the effects of quay on wave load calculations for a ship. 　　 Prediction of seakeeping behaviour of floating and submerged bodies in restricted and confined waters is another very important domain in offshore engineering.Therefore the effects of shallow water depth are also investigated in order toexamine the influence of sea bottom on wave loads. 　　 Computed numerical results for all above mentioned cases are compared with theavailable experimental and numerical results and favorable agreement is found. 　　 Based on the favorable results, it is concluded that 3-D panel method is an efficient and reliable method to compute hydrodynamic interaction effects for multiple bodies in close proximity.
作者：	Hasan Shaheen
专业：	Naval Architecture
导师：	Wen Yang Duan
授予学位：	硕士
授予学位单位：	哈尔滨工程大学
学位年度：	2006
正文语种：	中文