flute

Through the numerical simulation of grooved surface,this paper discusses near-wall fluid field.

通过对沟槽表面特殊流场的数值模拟研究,探讨了条纹沟槽表面存在减阻效果的内在原因。

The researches of drag reduction by grooved surface in water are mostly concentrated in experimentations recently, and researches in theory and numerical calculation are lacked.

近年来对于水下条纹沟槽表面减阻的研究多集中在试验方面,理论分析和数值计算进行的却不多。

The tire noise could be decreased as the depth,width,angle of tread groove were decreased and oblique pattern block was applied.

减小花纹沟槽的深度、宽度和角度,采用斜向花纹块可降低轮胎噪声;为了使噪声的频率更加分散,需要将轮胎花纹设计成不同的节距,节距排列比率采用较大的无理数,且随机排列。