Optimized group velocity control scheme and DNS of decaying compressible turbulence of relative high turbulent Mach number
Optimized group velocity control scheme and DNS of decaying compressible turbulence of relative high turbulent Mach number
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DOI：
10.1002/fld.941
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发表时间：
2005-07
影响因子：
1.8
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
为了克服高湍流马赫数下可压缩湍流数值模拟的困难，提出了一种新的GVC8格式。成功地对马赫数为0.95以下的衰减可压缩湍流进行了直接数值模拟。在较低的湍流马赫数下得到的统计量与前人在相同初始条件下得到的统计量符合得很好，但由于所谓的启动问题，它们仅限于在较低的湍流马赫数下模拟。分析了可压缩湍流的能谱和相干结构。研究了可压缩湍流的标度律。计算结果表明，尽管存在激波，但在衰变的可压缩湍流中仍存在扩展自相似特性，当湍流马赫数不是很高时，可压缩性对相对标度指数的影响不大。版权所有©2005 John Wiley&Sons，Ltd.
To overcome the difficulty in the DNS of compressible turbulence at high turbulent Mach number, a new difference scheme called GVC8 is developed. We have succeeded in the direct numerical simulation of decaying compressible turbulence up to turbulent Mach number 0.95. The statistical quantities thus obtained at lower turbulent Mach number agree well with those from previous authors with the same initial conditions, but they are limited to simulate at lower turbulent Mach numbers due to the so‐called start‐up problem. The energy spectrum and coherent structure of compressible turbulent flow are analysed. The scaling law of compressible turbulence is studied. The computed results indicate that the extended self‐similarity holds in decaying compressible turbulence despite the occurrence of shocklets, and compressibility has little effects on relative scaling exponents when turbulent Mach number is not very high. Copyright © 2005 John Wiley & Sons, Ltd.