海洋平台耦合分析的隐式区域分解方法

M. V. Rodrigues, Fabrício Nogueira Correa, B. P. Jacob
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引用次数: 28

摘要

本文介绍了用于海上石油开采浮动平台耦合分析的优化数值工具的实现。重点是时域,非线性动力分析,考虑到船体的水动力行为和系泊线和隔水管的结构行为之间的耦合,由有限元(FEs)建模。介绍了平台船体大振幅运动方程的建立和求解,包括水动力模型的简要描述和环境力的计算。本文还讨论了线结构模型空间离散化和时间离散化的主要方面。由于耦合分析可能需要过多的计算成本,本工作的目标是提出适用于手头问题的领域分解方法的实现和应用,以优化计算工具的效率。考虑了两组域分解方法:第一组是考虑到船体和线条之间存在的自然分割的子循环技术;第二步考虑FEs网格的内部分解,以表示系泊线和立管。这些方法的设计考虑到它们在具有并行体系结构的计算机中的实现。为了评估方法的性能,给出了数值应用的结果。
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Implicit domain decomposition methods for coupled analysis of offshore platforms
This work presents the implementation of optimized numerical tools for the coupled analysis of floating platforms for offshore oil exploitation. The focus is on time-domain, nonlinear dynamic analysis, considering the coupling between the hydrodynamic behaviour of the hull and the structural behaviour of the mooring lines and risers modelled by finite elements (FEs). Some aspects of the formulation and solution of the large-amplitude equations of motion of the hull of the platform are presented, including a brief description of the hydrodynamic models and calculation of the environmental forces. The main aspects of the formulation for the spatial and time discretization of the structural model for the lines are also discussed. Since coupled analyses may require excessive computational costs, the objective of this work is to present the implementation and application of domain decomposition methods, adapted and specialized for the problem at hand, in order to optimize the efficiency of the computational tool. Two groups of domain decomposition methods are considered: the first is a subcycling technique that takes into account the natural partition that exists between the hull and the lines; the second considers the internal decomposition of the mesh of FEs to represent the mooring lines and risers. The methods are devised having in mind their implementation in computers with parallel architecture. Results of a numerical application are presented in order to assess the performance of the methods.
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