轴对称旋成体流动结构的数值研究

Numerical study of flow structure on rotational symmetrical slender bodies

利用N-S方程模拟了旋成体的绕流过程。旋成体流场由不同层次的涡结构组成,包括主涡、二次涡t、ertiary涡、螺旋涡、羊角涡、U型马蹄涡。文中清晰地展示了这些结构,简要分析了各类结构的特性和功能,强调了亚结构和三维结构在流态发展与流场演变中的作用。

Flow around a cylinder with a sharp nose and a blunt nose at incidences was numerical simulated using time-dependent compressible laminar Navier-Stokes equations with a finite volume method incorporating a third-order-accurate discretization scheme. The structures of main vortices, secondary vortices, tertiary vortices, spiral vortices, Werle vortices and U-shaped horseshoe vortices are clearly displayed in this paper. Their characteristics and functions are briefly analyzed, and the effects of the hypo-structure and three-dimensional structure on the flow development are emphasized.