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Evaluation Methodology of Laminar-Turbulent Flow State for Fluidized Material with Special Reference to Submarine Landslide
| 题名： | Evaluation Methodology of Laminar-Turbulent Flow State for Fluidized Material with Special Reference to Submarine Landslide |
| 正文语种： | eng |
| 作者： | Xing-sen Guo;Ting-kai Nian;Zhong-de Gu;Dong-yang Li;Ning Fan;De-feng Zheng |
| 作者单位： | State Key Laboratory of Coastal and Offshore Engineering Dalian Univ. of Technology Dalian Liaoning 116024 China;State Key Laboratory of Coastal and Offshore Engineering Dalian Univ. of Technology Dalian Liaoning 116024 China;State Key Laboratory of Coastal and Offshore Engineering Dalian Univ. of Technology Dalian Liaoning 116024 China;State Key Laboratory of Coastal and Offshore Engineering Dalian Univ. of Technology Dalian Liaoning 116024 China;College of Civil Engineering and Architecture Wenzhou Univ. Wenzhou 325035 China;School of Geography Liaoning Normal Univ. Dalian 116029 China |
| 关键词： | Submarine landslide; Fluidization stage; Distinguishing methodology; Critical Reynolds number; Laminar; Turbulent |
| 摘要： | Submarine landslides have destroyed many ocean engineering facilities and induced catastrophic tsunamis, causing considerable loss of lives and properties. However, the evolution process of submarine landslides is highly complicated and difficult to describe with a unified mechanical framework. For fluidized landslides with wider influence ranges, faster migration velocities, and stronger impact forces, it is necessary not only to describe the constitutive model but also to determine the flow state. First, based on the essential rheological test for determining constitutive models, the relevant method and principle are thoroughly analyzed, and the formula for calculating the Reynolds number of fluidized submarine landslides in the entire shear process is derived. Taking the critical Reynolds number as the evaluation standard, a methodology to distinguish the flow state (laminar or turbulent) of fluidized landslides is quantitatively proposed. Second, through the low-temperature rheological test, the proposed formula and methodology are briefly applied to the natural submarine sediment samples in the South China Sea. In addition, the point of contraflexure of the rheological curve is consistent with the critical Reynolds number calculated by the formula, and the validity of this methodology is further verified. Finally, the mechanism of the flow-state transition is systematically analyzed by the internal evolution of the structure of the fluidized sediment samples in the shear process. This study provides important support for understanding the migration of fluidized submarine landslides. |
| 出版年： | 2021 |
| 期刊名称： | Journal of Waterway, Port, Coastal, and Ocean Engineering |
| 卷： | 147 |
| 期： | 1 |
| 页码： | 04020048.1-04020048.10 |
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