Direct numerical simulations of a turbulent channel with liquid infused surfaces made of longitudinal micro-ridges have been performed to study the effect of texture geometry and interface deformation. The flow conditions consider a viscosity ratio ${\mu }_1/{\mu }_2=0.37$, several values of the micro-ridge pitch and two different Weber numbers, We = 0 and We = 50. The performance is analyzed in terms of drag reduction (DR) with respect to an equivalent smooth channel, and the results compared with those available for super-hydrophobic surfaces (SHS). It is found that, due to the relatively high viscosity of the liquid locked in the substrate, the drag reduction offered by LIS is substantially lower than the corresponding SHS. When reported in terms of the streamwise slip length normalized in wall units, the amount of DR obtained by LIS in the ideal case of flat interface collapses on the SHS data. The interface dynamics has a detrimental effect on the performance, that becomes particularly severe when the pitch increases. The degradation of DR is well parametrized by the log-law shift of the velocity profile, that is found to be proportional to the difference between the virtual origin of the mean flow and that experienced by the overlying turbulence.

已经对具有由纵向微脊制成的液体注入表面的湍流通道进行了直接数值模拟，以研究纹理几何形状和界面变形的影响。流动条件考虑粘度比${\mu }_1/{\mu }_2=0.37$，微脊间距的几个值和两个不同的韦伯数，We  = 0 和We = 50。根据等效光滑通道的减阻 (DR) 分析性能，并将结果与​​可用于超疏水表面 (SHS) 的结果进行比较。发现，由于锁定在基底中的液体具有相对较高的粘度，LIS 提供的减阻显着低于相应的 SHS。当以壁面单位标准化的流向滑移长度报告时，LIS 在平坦界面的理想情况下获得的 DR 量在 SHS 数据上崩溃。界面动力学对性能有不利影响，当间距增加时，这种影响尤其严重。DR 的退化可以通过速度剖面的对数律位移很好地参数化，