Studying Burgers’ models to investigate the physical meaning of the alignments statistically observed in turbulence
Studying Burgers’ models to investigate the physical meaning of the alignments statistically observed in turbulence
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研究伯格斯模型以研究在湍流中统计观察到的排列的物理意义
DOI：
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发表时间：
1997
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影响因子：
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通讯作者：
B. Andreotti
中科院分区：
文献类型：
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作者：
B. Andreotti
在Burgers涡和Burgers层的情况下，计算并讨论了涡量、涡拉伸矢量、压力Hessian本征矢量和应变率本征矢量之间的对齐关系。结果表明，这些模型的主要物理性质可以推断出这些路线。在这个例子之后，这些矢量在湍流中的对齐被解释为由拉伸的、相干的和局部准二维区域主导。这导致了应变率和压力海森特征值的新的且更安全的分类。
The alignments between the vorticity, the vortex stretching vector, the pressure Hessian eigenvectors and the strain rate eigenvectors are computed and discussed in the case of the Burgers’ vortex and the Burgers’ layer. It is shown that the main physical properties of these models can be deduced from these alignments. Following this example, the alignments between these vectors in turbulent flows are interpreted as dominated by stretched, coherent and locally quasi-bidimensional regions. This induces a new and safer classification for the strain rate and the pressure Hessian eigenvalues.