Boundary conditions and vortex wandering

Boundary conditions and vortex wandering
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边界条件和涡流

DOI:
10.1017/jfm.2014.169
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发表时间:
2014
影响因子:
3.7
通讯作者:
Jammy S
Jammy S
中科院分区:
工程技术2区
文献类型:
--
作者:
Jammy S

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一个巴彻勒涡的直接数值模拟已经进行了自由衰减的湍流的存在下,使用周期性和对称的边界条件,后者最接近典型的实验条件,而前者经常用于计算模拟数值方便。研究表明,高阶速度统计数据强烈依赖于边界条件,但这种依赖性可以通过使用经常采用的技术来校正涡旋轨迹的随机高斯调制(通常称为“漂移”)来消除。在实验数据分析中。一旦校正了这种漂移,通常在涡中心观察到的雷诺应力的强峰值被位于核心区域内但远离中心的较小的局部极值所取代。修正后的雷诺应力的分布表明,形成和组织的核心内的二级结构的主要机制,在湍流的产生过程中的线性增长阶段的涡发展。
A direct numerical simulation of a Batchelor vortex has been carried out in the presence of freely decaying turbulence, using both periodic and symmetric boundary conditions; the latter most closely approximates typical experimental conditions, while the former is often used in computational simulations for numerical convenience. The higher-order velocity statistics were shown to be strongly dependent upon the boundary conditions, but the dependence could be mostly eliminated by correcting for the random, Gaussian modulation of the vortex trajectory, commonly referred to as ‘wandering’, using a technique often employed in the analysis of experimental data. Once this wandering had been corrected for, the strong peaks in the Reynolds stresses normally observed at the vortex centre were replaced by smaller local extrema located within the core region but away from the centre. The distributions of the corrected Reynolds stresses suggest that the formation and organization of secondary structures within the core is the main mechanism in turbulent production during the linear growth phase of vortex development.
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