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) |
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基金项目: | Supported by EPSRC/FSC (EP/I502033/1) and Leverhulme Trust (ECF/40348), UK |
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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.
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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 |
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Authors: | Shiqiang Yan Qingwei Ma Xiaoming Cheng |
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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 |
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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. |
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Keywords: | fully nonlinear interaction two floating structures transient behaviours potential flow QALE-FEM method |
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