二维混合层拟序结构的直接数值模拟 |
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引用本文: | 吴立新,是勋刚.二维混合层拟序结构的直接数值模拟[J].力学学报,1992,24(2):136-144. |
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作者姓名: | 吴立新 是勋刚 |
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作者单位: | 北京大学力学系湍流国家重点实验室 |
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摘 要: | 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。
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关 键 词: | 混合层 拟序结构 直接数值模拟 |
DIRECT NUMERICAL SIMULATION OF COHERENT STRUCT-URES IN TWO-DIMENSIONAL MIXING LAYER |
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Abstract: | 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... |
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Keywords: | mixing layer coherent structure DNS rolling up pairing |
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