采用流体体积(Volume of Fluid,VOF)水土两相流模型、SST k-ω湍流模型和Herschel-Bulkley模型建立二维海底管道局部冲刷数值模型,模拟黏土质海床管道冲刷,并对管道局部冲刷剖面、升力系数、冲刷坑最大深度等进行对比研究,分析阻流器不同安装位置和长度对管道冲刷特性的影响机制.结果表明:安装于管道正上方的阻流器会加剧管道局部冲刷,而且随着阻流器长度的增加,管道局部冲刷坑最大深度和宽度均增加;安装于管道后方且平行于来流方向的阻流器有助于抑制管道局部冲刷,冲刷坑最大深度和宽度均减小;安装于管道底部的双向刚性阻流器可有效避免管道局部冲刷的发生,当双向刚性阻流器长度在3D及以上时,管道局部冲刷基本不再发生.
Numerical Simulation of Pipeline Local Erosion with Additional Spoiler Under Clay Seabed
The Volume of Fluid(VOF)soil-water two-phase flow model is used in combination with the SST k-ω model and Herschel-Bulkley model to develop a two-dimensional numerical model of the local erosion of a submarine pipeline to model the erosion of a clay submarine pipeline.By comparing and studying the local erosion profile,lift coefficient,maximal depth of erosion pits,etc.of the pipelines,the impact mechanism of different installation positions and lengths of the spoiler on the pipeline erosion characteristics is analyzed.The results show that:the spoiler installed directly above the pipeline intensifies the local erosion,and the maximal depth and width of the local erosion pits of the pipeline increase as the spoiler length increases;the spoiler installed behind the pipeline and parallel to the inflow direction helps to suppress the local erosion,reducing the maximal depth and width of the erosion pit;the bidirectional rigid spoiler installed at the bottom of the pipeline is effective in preventing the local erosion,when the length of the bidirectional rigid spoiler is 3D or more,the local erosion of the pipeline essentially does not occur.
pipelineerosionspoilerVolume of Fluid(VOF)methodHerschel-Bulkley modelSST k-ω modelself-burial
NETL
NSTL
万方数据
