二维混合层拟序结构的直接数值模拟

本文是在文[1]的基础上,引用Cain等人(1981)提出的映射函数将无穷远的边界变换到有限距离处,用伪谱方法对N-S方程组进行直接数值模拟,研究时间发展的二维混合层的不稳定性,再现了大涡的卷起,涡对的合并与撕裂以及三个涡、四个涡之间的相互作用过程,并将过程进行了动态显示。

DIRECT NUMERICAL SIMULATION OF COHERENT STRUCT-URES IN TWO-DIMENSIONAL MIXING LAYER

This paper is to investigate the coherent structures of two-dimensionatemporally evolving mixing layer by direct numerical simulation (DNS) of Navier-Stokes equations using pseudospectral method. To avoid imaging error, mapping function designed by Cain et al. is used here to transform the original infinite region to a finite domain.The approach explains numerically the important role of fundamental perturbation wave-and its subharmonic wave in the formation, development and interaction of coherent structur...