# Vortex-Induced Vibration of Deep-Sea Mining Pipes: Analysis Using the Slicing Method
## 5 Summary and Outlook
### Prospect of Work  
In this paper, the study of vortex-induced vibration characteristics of deep-sea mining pipe under different oscillating flow frequencies and oscillating flow velocities is carried out by numerical simulation methods, providing a reference example for solving other similar fluid-structure coupling problems.  
However, considering the limitation of time and computational resources, there are still some deficiencies in our study, so some corresponding future research directions are proposed here:  
(1) In this paper, the impact of three-dimensional flow characteristics on the study of the fluid domain using the slice method is not fully considered. Since the slicing method focuses on two-dimensional analysis, it is difficult to fully capture the complex flow changes in three-dimensional space, such as the anisotropy of velocity gradient and the three-dimensional morphology of vortex structure, resulting in a certain degree of lack of accurate description of the real state of the three-dimensional flow field in the related research.  
In view of the continuous progress of computer technology, the \"thick slice method\" can be introduced to construct 3D slice structure models for subsequent numerical simulation and analysis, which can be applied in the field of flow computation. By increasing the thickness of the slices in a certain dimension, this method can take into account the computational efficiency, better restore the three-dimensional flow field characteristics, and then reach a more accurate fluid-solid coupling between the three-dimensional fluid region and the three-dimensional riser structure, which will strongly improve the accuracy of the description of the riser's kinematic characteristics and provide more reliable data support and a more reliable theoretical basis for the relevant marine engineering applications.  
(2) In actual engineering, during the transport process of a deep-sea mining pipe, the internal mineral flow also has the coupling vibration phenomenon with the pipe itself, which can be taken into consideration in the future in order to obtain more accurate vortex-induced vibration characteristics of the deep-sea mining pipe.  
The numerical analysis of riser vortex vibration has important implications for future research in many ways: in the field of ocean engineering, it helps to optimize riser design. By accurately simulating vortex-excited vibration, more reasonable riser structural parameters, such as diameter, wall thickness, and material selection, can be determined, improving the stability and durability of risers in complex ocean flow fields and reducing construction and maintenance costs. It can provide a theoretical basis for the development of new riser concepts and promote the expansion of ocean engineering to deeper waters and harsher environments.  
Conceptualization, X.W.; Methodology, X.W.; Software, X.W.; Validation, X.W.; Formal analysis, X.W.; Investigation, S.S.; Resources, S.S.; Data curation, S.S.; Writing--original draft, X.W.; Writing--review & editing, Y.D.; Visualization, F.L. and J.Z.; Supervision, F.L. and J.Z.; Project administration, S.S.; Funding acquisition, S.S. All authors have read and agreed to the published version of the manuscript.  
This research project is supported by multiple funding sources, including the NSFC-Shandong Joint Fund (U2106223), the Shandong Provincial Major Scientific and Technological Innovation Project (2021 CXGC010707), and the Shandong Provincial Natural Science Foundation (ZR2022 ME092).  
Not applicable.  
The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author.  
The authors declare that they have no conflict of interest.