柔性表皮与微沟槽耦合作用减阻效果数值模拟

Computational analysis on drag reduction effect by using of the flexible plate coupled with the micro-groove shape

本文采用粘流数值模拟方法,通过采用Workbench搭建双向流固耦合求解器,对带沟槽的柔性平板减阻效果进行数值模拟研究。数值计算结果表明,沟槽的存在使得柔性平板的减阻效果较光滑柔性平板有所增加,且弹性模量值越小,其增加效果越明显。通过查看相应的柔性平板表面的平板法向位移及应力分布,可以看出沟槽的存在使得沟槽的存在使得柔性平板表面变形量大幅增大,因此流体缓冲效果变好,减阻性能有所增加。

A numerical investigation is carried out on investigating the drag reduction effect of flexible plate coupled with the micro-groove shape by using of the bi-directional fluid structure interaction.The simulation result shows that the existence of the micro-groove can do more benefit on reducing the drag resistance than that of smoothly flexible plate.In addition,the numerical result also indicates that the higher the value of elastic module is,the higher the drag reduction ratio will be.The underlying mechanism lies in the existence of micro-groove helps enhance the deformation amplitude on the surface,providing much benefit on slowing down the speed of surface flow.