With the development of biomimetic surface engineering technology

the drag reduction characteristics of surface microtexture have been studied more and more

but its application is limited by the complex surface shape of the object and other conditions. A single microtexture is not applicable to the overall situation

and the overall analysis will consume a large amount of computing costs. In order to solve this problem

this paper adopts the idea of discrete

divides the complex surface into local facet to consider

and explores the drag reduction characteristics of micro-texture on local facet. Based on boundary layer theory

a design method of micro texture height and position is proposed

and in a small flat surface layout of different shape

depth

width and spacing of V–groove structure

using the method of computational fluid dynamics simulation of airflow in the small flat surface

various characteristic parameters for V–groove on the choice of drag reduction effects are explored. After analysis

the following rule can be obtained. When the flow velocity is 25m/s

the triangular micro-texture groove with depth of 0.2mm and width of 0.3mm has the best drag reduction effect

reaching 5.51% and the best dimensionless parameter y + =13.86. In microtexture designing

the dimensionless depth parameter is kept at about 14

which has the best drag reduction effect. The width to depth ratio of the drag reduction microtexture must be less than 1.5

and the smaller the spacing

the more obvious the drag reduction effect.