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arXiv 1012.1726math.AP
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概周期流的Leray问题

On Leray's problem for almost periodic flows

Luigi C. Berselli, Marco Romito

摘要:

在(时间)殆周期函数的设定下,证明了半无限圆柱中完全发展的(Poiquilille型)流动的存在性和唯一性。在情况下Stepanov殆周期函数的证明是基于一个详细的变分分析的线性“逆”问题,而在贝西科维奇设置的证明如下的精确分析波数。接下来,我们使用我们的结果来构建一个独特的殆周期解的所谓的“勒雷问题”关于三维流体运动在两个半无限圆柱连接有界水库。在Stepanov函数的情况下,我们需要一个自然的限制通量的大小,而贝西科维奇解决方案的某些限制广义傅里叶系数的要求。

英文摘要:

We prove existence and uniqueness for fully-developed (Poiseuille-type) flows in semi-infinite cylinders, in the setting of (time) almost-periodic functions. In the case of Stepanov almost-periodic functions the proof is based on a detailed variational analysis of a linear "inverse" problem, while in the Besicovitch setting the proof follows by a precise analysis in wave-numbers. Next, we use our results to construct a unique almost periodic solution to the so called "Leray's problem" concerning 3D fluid motion in two semi-infinite cylinders connected by a bounded reservoir. In the case of Stepanov functions we need a natural restriction on the size of the flux, while for Besicovitch solutions certain limitations on the generalized Fourier coefficients are requested.

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