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arXiv 1001.4237math.AP
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流体动力方程三维空间周期解的Gevrey-Sobolev范数的先验界

A priori bounds for Gevrey-Sobolev norms of space-periodic three-dimensional solutions to equations of hydrodynamic type

V. Zheligovsky

摘要:

我们提出了一种技术推导的先验界的空间周期三维解的Gevrey-Sobolev范数的发展偏微分方程的流体动力类型。它涉及傅立叶空间中的流速的变换,其在范数的指数和变换后的解的范数之间引入反馈,并且导致出现温和耗散项。为了说明这种技术,我们推导出有限时间的界限Gevrey-Sobolev范数的解决方案的欧拉和无粘Burgers方程,和全球的Voigt型正则化的欧拉和Navier-斯托克斯方程的时间界限(假设各自的范数的初始条件是有界的)。范数的有界性意味着解在空间中的解析性。

英文摘要:

We present a technique for derivation of a priori bounds for Gevrey-Sobolev norms of space-periodic three-dimensional solutions to evolutionary partial differential equations of hydrodynamic type. It involves a transformation of the flow velocity in the Fourier space, which introduces a feedback between the index of the norm and the norm of the transformed solution, and results in emergence of a mildly dissipative term. To illustrate the technique, we derive finite-time bounds for Gevrey-Sobolev norms of solutions to the Euler and inviscid Burgers equations, and global in time bounds for the Voigt-type regularisations of the Euler and Navier-Stokes equation (assuming that the respective norm of the initial condition is bounded). The boundedness of the norms implies analyticity of the solutions in space.

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