| Seabed foundation,as an important platform for ocean information observation,is of great significance to the development of Marine science and technology in China.At present,the numerical simulation method is mainly used in the research of local scour of seabed foundation and the research in different flow environment and different soil foundation still needs to be further studied.With the maturity of CFD and the improvement of computer configuration,the numerical simulation method will have a key impact on the study of local scour of seabed foundation.This paper mainly carries out the following work:(1)Introduces the development history of seabed foundation at home and abroad,the structure of seabed foundation,and the detailed process of seabed foundation layout,setting,recovery and landing.Introduces the mechanism of local scour,and then introduces the development of the research on sediment scour under the conditions of steady flow,wave current and reciprocating flow,as well as the research status of nonuniform sand bed scour at home and abroad.(2)Use Flow-3D sediment scour model to simulate the local scour of the cylinder to verify the feasibility of the design method.(3)The scour model of seabed foundation is established.Firstly,three kinds of seabed foundations with different appearances are compared,and the scour development trend and the differences among them are analyzed from the aspects of surrounding smooth distribution,scour pattern and scour pit depth.Then,the scour phenomenon of octagonal seabed foundation under the action of steady current,wave current and tidal current is studied The scour trend and scour pit depth under the action of steady current,wave current and tidal current are analyzed respectively.(4)The structure of the octagonal seabed foundation cover is designed and compared with the calculation results of the original structure from the aspects of flow field distribution and scouring depth to verify its anti scouring effect. |
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