Dynamic Analysis of Submarine-Buried Pipelines Considering Fluid-Structure Interaction

作     者：Xu, Huilin Guo, Qiang Wang, Xuetong Sun, Huihui Dong, Zhanwang Gu, Jintong Zhang, Chengyu 

作者机构：Yancheng Polytech Coll Dept Architecture & Engn Yancheng 224005 Jiangsu Peoples R China Yancheng Inst Technol Sch Mech Engn Yancheng 224051 Peoples R China Beijing Univ Technol Coll Mech & Energy Engn Beijing 100124 Peoples R China 

出 版 物：《WATER》 (Water)

年 卷 期：2025年第17卷第3期

页      面：360-360页

核心收录：

基　　金：School-level Research Projects of Yancheng Institute of Technology XJR2022004 

主　　题：fluid-structure interaction pipe flow buried pipeline water hammer 

摘      要：Buried pipes are widely used for submarine water transportation, but the complex operating conditions in the seabed pose challenges for the modeling of buried pipes. In order to more accurately capture the dynamic behavior of the buried pipes in the seabed, in this study, considering the pipeline and soil as a systematic structure is proposed, improving the fluid-structure interaction four-equation model to make it applicable for the calculation of buried pipe system modes. After verifying the practicality of the model, considering the external seawater as uniform pressure, the coupling at the joints, and the Poisson coupling of submarine pipelines during transient processes are discussed, revealing that structural vibrations under both forms of coupling will cause greater hydraulic oscillations. The impact of soil elastic modulus on the system s response is further discussed, revealing that increasing the modulus from 0 to 1015 Pa raises the wave speed from 498 m/s to 1483 m/s, causing a 40% increase in the amplitude of pressure oscillations. Finally, the vibration modes of the combined structure of pipe wall and soil are discussed, revealing that the vibration modes are mainly dominated by water hammer pressure, with the superposition of pipeline stress waves and soil stress waves. In this study, the dynamic behavior of submarine pipelines is elucidated, providing a robust foundation for regulating and mitigating fatigue failures in such systems.