Implicit LES of Compressible Turbulent Flow
Implicit LES of Compressible Turbulent Flow
复制标题
可压缩湍流的隐式 LES
DOI：
10.2514/6.2007-920
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
K. Sawada
中科院分区：
文献类型：
--
作者：
Keiichi Ishiko;N. Ohnishi;K. Sawada
基于单调积分大涡模拟的思想，发展了一个可压缩流动的隐式大涡模拟程序。为了获得高精度的流场分辨率，我们采用了加权紧致非线性格式。通过与直接数值模拟的能谱惯性范围的比较，验证了所开发的程序在二维均匀湍流中的有效性。并与其它两种大涡模拟方法进行了比较。结果表明，本方法可以再现的惯性范围内的能量谱相媲美的DNS。在高波数极限时，能谱会自然截断，这表明本方法适当地考虑了耗散效应。该方法可以非常清晰地捕捉涡量等值线，而没有任何数值振荡。
An implicit Large Eddy Simulation code for compressible flows have been developed, based on the idea of Monotonically Integrated LES. We employ Weighted Compact Nonlinear Scheme in order to attain high accurate resolution of the flowfield. The developed code is verified for the two-dimensional homogeneous turbulent flow, by comparing the inertial range of the energy spectrum with the Direct Numerical Simulation. The comparisons with other two LES approaches are also made. It is shown that the present approach can reproduce the inertial range in the energy spectrum comparable to that by the DNS. A truncation of energy spectrum occurs naturally at high wave number limit, which indicates that the dissipative eect is included properly in the present approach. The present approach can capture the vorticity contours very sharply without any numerical oscillations.