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arXiv physics/0307144physics.opticsphysics.ao-phphysics.data-anphysics.flu-dyn
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光在湍流介质中的传播

Light Propagation in Turbulent Media

Dario G. Perez

摘要:

首先,我们对最新的无源标量场性质进行了修正:折射率也是其中之一。之后,我们制定的属性,使家庭的“各向同性”分数布朗运动(参数H)一个很好的候选人来模拟湍流折射率。此外,我们还得到了它的分形维数,它与Constantin对被动标量的估计相吻合,因此参数H决定了湍流的状态。其次,使用带有马尔可夫模型的路径积分速度表示来计算网格系统上湍流的影响。最后,利用分数布朗运动的随机微积分工具,研究了湍流情况下几何光学中的光线方程。我们的分析涵盖了平均温度梯度相关的情况。

英文摘要:

First, we make a revision of the up-to-date Passive Scalar Fields properties: also, the refractive index is among them. Afterwards, we formulated the properties that make the family of `isotropic' fractional Brownian motion (with parameter H) a good candidate to simulate the turbulent refractive index. Moreover, we obtained its fractal dimension which matches the estimated by Constantin for passive scalar, and thus the parameter H determines the state of the turbulence. Next, using a path integral velocity representation, with the Markovian model, to calculate the effects of the turbulence over a system of grids. Finally, with the tools of Stochastic Calculus for fractional Brownian motions we studied the ray-equation coming from the Geometric Optics in the turbulent case. Our analysis covers those cases where average temperature gradients are relevant.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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