沟槽型面减阻特性数值模拟研究

Numerical Analysis of Turbulent Drag Reduction Using Riblets

基于人工压缩性方法,时间项采用隐式离散、对流项采用基于Roe近似Riemann解的迎风格式,研究了三维不可压粘性流动的数值模拟方法,湍流模型采用Baldwin-Barth一方程模型,利用所发展的不可压粘性流数值模拟方法,对典型几类V型、间隔三角型和U型沟槽型面的不可压粘性流场进行了数值模拟计算研究,探索了上述几类沟槽型面参数对湍流减阻特性的影响规律,从表面摩阻、速度场等方面分析了上述几类沟槽型面的减阻作用机理。研究结果表明:上述典型沟槽的减阻效果可以分别达到7.6%,10.5%和5.0%,与国内外相关实验结果符合一致,所发展的计算方法是成功的、可行的。

Based on the method of artificial compressibility, a numerical method is studied for three- dimensional incompressible viscous flow over the riblet configurations, employing the Baldwin- Barth one- equation turbulence model, using implicit scheme for time terms and a third- order flux- difference splitting technique for the convective terms. The numerical computations of flows over symmetric V- groove, spaced triangular and valley curvature riblet non- smooth surfaces are performed and their geometric parameters are compared to discuss the turbulent drag reduction characteristics. The mechanism of the drag reduction is analyzed through skin frictions and velocities. It is showed that the drag can be reduced by 7.6%, 10.5 %, and 5.0% respectively in the above results, which agrees well with the known experimental data and indicates that the present method is correct and feasible.