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The effects of the tip shape of V-groove on drag reduction and flow field characteristics by numerical analysis;

V型沟槽尖峰形状对减阻效果及流场特性影响的数值分析

The flow in turbulent boundary layer and the viscous drag over V-groove surface are numerically simulated using the RANS formula and RNG k-ε turbulence model.

采用雷诺平均N-S方程和RNGk-ε湍流模型计算V型沟槽面的湍流边界层流动和粘性阻力,研究了沟槽尖峰形状和雷诺数对减阻效果的影响规律,初步分析了沟槽面减阻机理。

The flow in turbulent boundary layer and the viscous drag over V-groove surface are numerically simulated by using the RANS formula and RNG-turbulence model.

采用雷诺平均N-S方程和RNGk-ε湍流模型计算V型沟槽面的湍流边界层流动和黏性阻力,通过改变来流速度大小和沟槽面布置位置,研究了雷诺数对沟槽减阻特性的影响规律。

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。