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原文传递 Quantitative Composition of Drag Forces on Suspended Pipelines from Submarine Landslides

题名：	Quantitative Composition of Drag Forces on Suspended Pipelines from Submarine Landslides
正文语种：	eng
作者：	Xing-sen Guo;De-feng Zheng;Lu Zhao;Cui-wei Fu;Ting-kai Nian
作者单位：	Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean Univ. of China Qingdao 266100 China State Key Laboratory of Coastal and Offshore Engineering Dalian Univ. of Technology Dalian 116024 China;School of Geography Liaoning Normal Univ. Dalian 116029 China;School of Civil Engineering Dalian Univ. of Technology Dalian 116024 China;State Key Laboratory of Coastal and Offshore Engineering Dalian Univ. of Technology Dalian 116024 China;State Key Laboratory of Coastal and Offshore Engineering Dalian Univ. of Technology Dalian 116024 China
关键词：	Submarine landslide; Deep-water pipeline; Interaction; Frictional drag force; Pressure drag force; Evolutionary mechanism
摘要：	The impact forces of submarine landslides (i.e., non-Newtonian fluids) on oil and gas pipelines, especially the most dangerous drag force, are of great significance in the design of deep-water pipelines. The drag force is composed of two parts: the pressure drag force and the frictional drag force. However, previous studies have not quantified their proportion and magnitude, and thus it is highly difficult to analyze their evolution characteristics and mechanisms in detail. In this paper, a methodology to quantitatively obtain the pressure and frictional drag forces of submarine landslide-ambient water-pipeline interaction using computational fluid dynamics (CFD) is first proposed. Second, under four typical Reynolds number conditions, homogeneous fluidized submarine landslides impacting suspended pipelines applied by two boundary conditions (i.e., free slip and no-slip wall boundary conditions on the pipeline surface) are systematically simulated, respectively. Third, the quantitative relationship between the total, pressure, and frictional drag force coefficients is established, and the variation of their characteristic values with changing Reynolds number is analyzed. Finally, the evolutionary mechanism of the frictional drag force is explained by the change in the tangential stress of the landslide in the boundary layer on the pipeline surface, and the variation mechanism of the pressure drag force with changing Reynolds number is elucidated by the boundary layer separation, streamline evolution, and distributed pressure variation around the pipeline, which provides a theoretical basis for submarine pipeline design.
出版年：	2022
期刊名称：	Journal of Waterway, Port, Coastal and Ocean Engineering
卷：	148
期：	1
页码：	04021050.1-04021050.12