Direct numerical simulation of passive scalar in decaying compressible turbulence
Direct numerical simulation of passive scalar in decaying compressible turbulence
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DOI：
10.1360/03yw0029
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发表时间：
2004-01
期刊：
影响因子：
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通讯作者：
Xinliang Li;D. Fu;Yanwen Ma
中科院分区：
文献类型：
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作者：
Xinliang Li;D. Fu;Yanwen Ma
采用7阶迎风差分格式和8阶群速度控制格式，对初始雷诺数Re=72，初始湍流马赫数Mt=0.2-0.9，被动标量施密特数Sc=2-10的衰减可压缩湍流中的被动标量进行了数值模拟。采用不同的数值方法和不同的网格尺寸对计算结果进行了验证。在标量谱中发现了k −1范围的巴彻勒标度。被动标量谱随湍流马赫数的增加衰减得更快。在可压缩湍流的被动标量中发现了扩展自相似性。
The passive scalars in the decaying compressible turbulence with the initial Reynolds number (defined by Taylor scale and RMS velocity) Re=72, the initial turbulent Mach numbers (defined by RMS velocity and mean sound speed) Mt=0.2–0.9, and the Schmidt numbers of passive scalar Sc=2–10 are numerically simulated by using a 7th order upwind difference scheme and 8th order group velocity control scheme. The computed results are validated with different numerical methods and different mesh sizes. The Batchelor scaling withk−1 range is found in scalar spectra. The passive scalar spectra decay faster with the increasing turbulent Mach number. The extended self-similarity (ESS) is found in the passive scalar of compressible turbulence.