中文摘要：

为了分析在海床冲刷形成浅沟后,自埋现象发生前,海底管线处于悬空状态时,竖向导流板对海底管线涡激振动的影响,在此,通过ANASYS软件对不同导流板高度下,管线周围的流场、压力场等进行了数值模拟分析,得出如下结论：安装导流板后,管线受到的升力系数均值小于0,随着导流板高度与管径之比（h/D）的增加,升力系数幅值不断下降,在高度比h/D为0.375时,基本达到最小值,管线受力总体向下,有利于管线的下沉自埋。在导流板高度与管径比（h/D）为0.25时,发生了涡激振动中的＂准周期拍击现象＂。拖曳力随着导流板的增大而增加,管线受到的横向作用力增加,其对管线的强度要求增加。

英文摘要：

In order to analyze the influence of vertical reflectors on the vortex-induced vibration of subsea pipelines after a shallow gully has formed by seabed scouring,before the self-burial phenomenon occurs,and when the subsea pipelines are still suspended,we used ANASYS software to carry out a numerical simulation analysis on the flow and pressure fields surrounding the pipelines at different deflector heights. The following results were obtained： after the installation of the deflector,the average coefficient of the lift force borne by the pipeline was less than zero.With increases in the ratio of the reflector height to the pipe diameter（ h / D）,the amplitude of the lift coefficient continuously decreased. When the h / D ratio was 0.375,the amplitude of the lift coefficient reached a minimum value,and the force borne by the pipelines was generally downwards,which can help the pipelines to sink and be buried on their own. When the h / D ratio was 0.25,a quasi-periodic slapping phenomenon occurred in the vortex-induced vibration. The drag force increased with the enlargement of the deflector. With an increase of the horizontal force borne by the pipeline,the required strength of the pipeline also increases.