湍流状态下超疏水表面流场减阻特性数值仿真研究

通过对湍流状态下具有特定微观尺寸的超疏水表面流场进行数值仿真计算,对超疏水表面流场的减阻特性进行了分析。针对超疏水表面矩形微观形貌特点,计算域采用结构化网格进行划分,采用VOF多相流模型,Realizable湍流模型,对超疏水表面流场进行仿真。结果表明:受微观形貌的影响,超疏水表面在宏观上的壁面滑移、微观凹坑处的低剪应力和近壁面的低湍流度是其具有减阻特性的重要原因;超疏水表面减阻特性受凹坑内空气体积比影响很大,但是在凹坑内全充满液体条件下,依然具有减阻效果。

Numerical simulation of drag reduction of superhydrophobic surface in turbulent channel flow

The turbulent flow in a channel with superhydrophobic surface was studied by numerical simulation,and the drag of the surface was analyzed.We applied structural grid to grid the field,and VOF model and Realizable k-ε turbulent model to make the simulation.It shows that: the wall slip and low turbulent enerage near the wall are the importment factors that make the drag of hydrophobic surface reduced;the volume of the air in the cavity influences the drag of superhydrophobic surface obviously,however,the drag reduction still exit even if the cavity were full of water.