In order to deeply understand the self-burial mechanism of subsea pipeline with spoiler,a numerical model of the flow past near wall subsea pipeline with spoiler at high Reynolds number is established based on Fluent software and standard k-e turbulence model.The effects of spoiler length and gap ratio on the complex interaction and spatio-temporal evolution between the wake flow of pipeline and boundary layer of wall are studied.The study results indicate that the flow velocity between the pipeline and wall,and the fluctuated velocity in the proximity of the pipeline increase significantly due to the existence of spoiler.However,when the spoiler length reaches a critical value,a stable wake structure forms at the rear of the pipeline.With the increase of gap ratio,the evolution of the wake flow can be divided into four regions:stable structure,double induced wall vortex,single induced wall vortex and Karman vortex street.Proper gap ratio is conducive to inducing wall vortex and accelerating sediment scouring process around the pipeline.
关键词
阻流器/海底管道/壁面/圆柱绕流/湍流
Key words
spoiler/subsea pipeline/wall/flow past cylinder/turbulence
维普
万方数据