Geometric features of the mixing of passive scalars at high Schmidt numbers.
Geometric features of the mixing of passive scalars at high Schmidt numbers.
复制标题
高施密特数下无源标量混合的几何特征。
DOI：
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发表时间：
2003
影响因子：
8.6
通讯作者：
K. Sreenivasan
中科院分区：
文献类型：
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作者：
J. Schumacher;K. Sreenivasan
研究了扩散系数递减的被动标量的混合，每种情况下都是由相同的三维Navier-Stokes湍流平流。随着扩散系数的减小，混合变得更加各向同性。在最陡峭的正负标量梯度附近的局部流动通常是不同的，并研究了不同标量扩散系数值时的局部流动行为。随着扩散系数的减小，混合接近于单裂解性质。我们在标量耗散的可能奇点的背景下考虑这些结果。
The mixing of passive scalars of decreasing diffusivity, advected in each case by the same three-dimensional Navier-Stokes turbulence, is studied. The mixing becomes more isotropic with decreasing diffusivity. The local flow in the vicinity of steepest negative and positive scalar gradients is in general different, and its behavior is studied for various values of the scalar diffusivity. Mixing approaches monofractal properties with diminishing diffusivity. We consider these results in the context of possible singularities of scalar dissipation.