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完全非线性方法的两个三维自由浮体瞬态行为数值模拟研究(英文)
基金项目:Supported by EPSRC/FSC (EP/I502033/1) and Leverhulme Trust (ECF/40348), UK
摘    要:Two floating structures in close proximity are very commonly seen in offshore engineering. They are often subjected to steep waves and, therefore, the transient effects on their hydrodynamic features are of great concern. This paper uses the quasi arbitrary Lagrangian-Eulerian finite element method (QALE-FEM), based on the fully nonlinear potential theory (FNPT), to numerically investigate the interaction between two 3-D floating structures, which undergo motions with 6 degrees of freedom (DOFs), and are subjected to waves with different incident angles. The transient behaviours of floating structures, the effect of the accompanied structures, and the nonlinearity on the motion of and the wave loads on the structures are the main focuses of the study. The investigation reveals an important transient effects causing considerably larger structure motion than that in steady state. The results also indicate that the accompanied structure in close proximity enhances the interaction between different motion modes and results in stronger nonlinearity causing 2nd-order component to be of similar significance to the fundamental one.

关 键 词:fully  nonlinear  interaction  two  floating  structures  transient  behaviours  potential  flow  QALE-FEM  method

Numerical investigations on transient behaviours of two 3-D freely floating structures by using a fully nonlinear method
Authors:Shiqiang Yan  Qingwei Ma  Xiaoming Cheng
Institution:School of Engineering and Mathematical Sciences, City University London, London EC1V 0HB, United Kingdom 2. GL-Noble Denton UK, London EC2A 4AA, United Kingdom
Abstract:Two floating structures in close proximity are very commonly seen in offshore engineering. They are often subjected to steep waves and, therefore, the transient effects on their hydrodynamic features are of great concern. This paper uses the quasi arbitrary Lagrangian-Eulerian finite element method (QALE-FEM), based on the fully nonlinear potential theory (FNPT), to numerically investigate the interaction between two 3-D floating structures, which undergo motions with 6 degrees of freedom (DOFs), and are subjected to waves with different incident angles. The transient behaviours of floating structures, the effect of the accompanied structures, and the nonlinearity on the motion of and the wave loads on the structures are the main focuses of the study. The investigation reveals an important transient effects causing considerably larger structure motion than that in steady state. The results also indicate that the accompanied structure in close proximity enhances the interaction between different motion modes and results in stronger nonlinearity causing 2nd-order component to be of similar significance to the fundamental one.
Keywords:fully nonlinear interaction  two floating structures  transient behaviours  potential flow  QALE-FEM method
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