Coherent vortex extraction in 3D turbulent flows using orthogonal wavelets
Coherent vortex extraction in 3D turbulent flows using orthogonal wavelets
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DOI：
10.1103/physrevlett.87.054501
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发表时间：
2001-07-30
影响因子：
8.6
通讯作者：
Schneider, K
中科院分区：
文献类型：
--
作者：
Farge, M;Pellegrino, G;Schneider, K
本文介绍了一种从三维湍流中提取相干涡的小波技术，并将其应用于分辨率为N = 256的均匀各向同性湍流。相干流仅由保留涡管的3%N小波系数重建，并且98.9%的能量具有与总流相同的k（-5/3）谱。相反，剩余的97%N小波系数对应于非相干流，其是无结构的、去相关的，并且其效果因此可以被统计地建模。
This Letter presents a wavelet technique for extracting coherent vortices from three-dimensional turbulent flows, which is applied to a homogeneous isotropic turbulent flow at resolution N = 256(3). The coherent flow is reconstructed from only 3%N wavelet coefficients that retain the vortex tubes, and 98.9% of the energy with the same k(-5/3) spectrum as the total flow. In contrast, the remaining 97%N wavelet coefficients correspond to the incoherent flow which is structureless, decorrelated, and whose effect can therefore be modeled statistically.