运用ANSYS软件对气液两相流海洋立管进行了流固耦合特性分析，包括模态分析和动力学分析。模态分析研究了有无流固耦合存在时立管振动模态的变化以及流体边界条件对立管固有频率和阵型的影响；同时，将仿真分析同DNV公式求解的固有频率进行了对比验证。动力学分析研究了单、双向流固耦合振动分析，并将单、双向流固耦合进行了对比分析，同时考虑了立管支承方式、流体边界条件对立管振动的影响，提出了立管减振措施。分析结果对海洋立管的优化设计和运行的可靠性提供了重要的理论意义。
Abstract
Here, the software ANSYS was used to perform fluid-structure interaction characteristics analysis of a gas-liquid two-phase flow marine riser including modal analysis and dynamic analysis. Modal analysis was used to study change of vibration modes of the riser with and without fluid-structure interaction and effects of fluid boundary conditions on natural frequencies and modal shapes of the riser. Then, natural frequencies solved using simulation analysis were compared with those solved using DNV formula to verify the correctness of simulation. Dynamic analysis was used to study fluid-structure interaction vibration analyses in single direction and double ones, and contrastively analyze both of them considering effects of riser support mode and fluid boundary conditions on riser vibration. Finally, the vibration reduction measures for riser were proposed. The study results provided an important theoretical basis for optimal design and operation reliability of marine risers.
关键词
气液两相流 /
海洋立管 /
流固耦合 /
模态分析 /
动力学分析
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Key words
gas-liquid two-phase flow /
marine riser /
fluid-structure interaction /
modal analysis /
dynamic analysis
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