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The fractional landau model

机译:分数兰道模型

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摘要

Herein the Landau model of the transition from laminar to turbulent fluid flow is generalized to include the effect of memory. The original Landau model is quadratically nonlinear and memoryless, with turbulent fluctuations decaying exponentially. However, recent experiments show a dependence of the decay of fluctuations on memory, with the exponential being replaced by an inverse power law. This transition is explained herein as being due to critical slowing down. The fractional calculus is used to model this memory and to relate the index of the inverse power law decay to that of the fractional derivative in time.
机译:在此,从层流到湍流的过渡的Landau模型被概括为包括记忆效应。原始的Landau模型是二次非线性且无记忆的,湍流波动呈指数衰减。但是,最近的实验表明,波动的衰减与记忆有关,指数被反幂定律所代替。本文将这种转变解释为是由于严重减速造成的。分数微积分用于对该内存进行建模,并将逆幂律衰减的指数与分数微分的时间指数相关联。

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