不同宽高比的V型随行波表面减阻仿真研究

为获得内壁具有不同宽高比的V型随行波的管道模型的微观流场及减阻规律，使用计算机软件对各模型进行了不同速度下的一系列数值仿真计算。在建模过程中为减小计算量，采用了二维管道剖面代替三维管道模型的方法，并选用了更适于旋转流和近壁湍流的湍流RNG K-ε模型进行计算。仿真结果表明：在流动中，管道内壁随行波产生有利于壁面减阻的旋涡，且旋涡疏密与随行波的宽高比有关。相同高度条件下，减阻效果会随着随行波宽高比的变大而增强。结果为减阻技术的工程化应用提供了重要依据。

Simulation study on surface drag-reduction with V-size traveling wave of different aspect ratios

A series of numerical simulations under various velocities about V-size traveling wave models with different aspect ratios of innerwall has been carried out for gaining the diagrams of microcosmic fluid field and the rules of drag reduction of each model by computer software.In the modeling process,in order to reduce the quantity of calculating,this paper adopts two-dimensional tube section instead of three-dimensional tube model,and adopts the turbulent RNG K-ε model which is more suitable for calculating of rotational flow and the turbulent flow of near-wall.Simulation results show that the traveling wave of the tube innerwall generates the vortexes which are beneficial to the drag reduction of the traveling wave wall.The densities of the vortexes are related to the ones of the traveling waves,and the drag reduction effect of the V-size traveling waves is increased as the ratios of the traveling waves are getting larger with the same height.The results provide the important basis for the project application of drag reduction technology.