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arXiv 1806.08207physics.flu-dyn
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相关随机游动中的分形维数和轨迹交叉

Fractal dimensions and trajectory crossings in correlated random walks

A. Dubey, J. Meibohm, K. Gustavsson, B. Mehlig

摘要:

我们研究了空间聚类在一个离散的,一维的,随机的,玩具模型中的重粒子在湍流和计算的频谱的多重分形维数$D_q$作为一个无量纲的参数,$α$,发挥作用的惯性参数的函数。利用这一事实,它足以考虑线性动力学的模型在小的分离,我们发现,$D_q =D_2/(q-1)$为$q=2,3,\ldots$。关联维数$D_2$是惯性参数的非解析函数。我们计算小$α$的$D_2$,直到非解析项中的下一个前导顺序。

英文摘要:

We study spatial clustering in a discrete, one-dimensional, stochastic, toy model of heavy particles in turbulence and calculate the spectrum of multifractal dimensions $D_q$ as functions of a dimensionless parameter, $α$, that plays the role of an inertia parameter. Using the fact that it suffices to consider the linearized dynamics of the model at small separations, we find that $D_q =D_2/(q-1)$ for $q=2,3,\ldots$. The correlation dimension $D_2$ turns out to be a non-analytic function of the inertia parameter in this model. We calculate $D_2$ for small $α$ up to the next-to-leading order in the non-analytic term.

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