In this paper,based on the finite volume method,a two-dimensional CFD model of local scour of submarine pipeline is established by using the Herschel-Bulkley clay model and VOF two-phase flow model,and the numerical simulation is conducted on the variable parameters of gap ratio and embedding ratio.The characteristics of bed pressure on both sides of the pipeline,scour hole morphology,resistance coefficient duration curve and local velocity distribution of the pipeline are analyzed,and the law of influence of gap ratio and embedding ratio on local scour characteristics of submarine pipelines is revealed.The results show that:(1)The local scour of submarine pipelines in a clay seabed environment is significantly affected by initial gap ratio.The local equilibrium scour depth of the pipeline shows an overall downward trend.The smaller the initial gap ratio,the more significant the pipeline scour effect.The larger the initial gap ratio,the more significant the wake scour.(2)The local scour of submarine pipelines in the clay seabed environment is significantly affected by the initial embedding ratio.With the increase of the initial embedding ratio,the local limit equilibrium scour depth and the width of scour hole decrease.When the initial embedding ratio of the pipeline is 0.1,it is difficult to form a gap between the bottom of the pipeline and the seabed.
维普
万方数据
