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arXiv 1101.0801math.AP
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三维Navier-斯托克斯方程的Cauchy问题。解决方案的新方法及其理由

The Cauchy problem for the 3D Navier - Stokes equations. New approach to the solution and its justification

A. Tsionskiy, M. Tsionskiy

摘要:

关于Euler和Navier-Stokes方程斯托克斯方程的一些已知结果由不同的作者得到。二维Navier-斯托克斯方程解的存在性和光滑性是人们长期以来所知的。Leray证明了三维空间中的Navier-斯托克斯方程存在弱解。Scheffer和Shnirelman得到了时空中具有紧支集的Euler方程的弱解。Caffarelli、Kohn和Nirenberg改进了Scheffer的结果,F. H. Lin简化了J.Leray结果的证明。关于Euler和Navier-斯托克斯方程的弱解的行为的许多问题和定理在Bertozzi和Majda、Constantin或Lemarié-Rieusset的著作中有描述。在$\cite{TT10}$中,利用Fourier变换和Laplace变换,用解析迭代法求解了二维和三维Navier-Stokes方程和Euler方程的初值问题(Cauchy问题)。这些解决方案是以无限可微函数的形式收到的,这使我们能够在更深的层次上和更详细地分析问题的各个方面。这种光滑解也满足$\cite{CF06}$中Navier-斯托克斯方程问题所要求的条件。对于问题参数的几种组合,得到数值结果,并以图形$\cite{TT10}$,$\;\cite{TT11}$表示。本文详细证明了三维Navier-斯托克斯方程Cauchy问题的分析迭代法的收敛性。收敛性示出了广泛的问题的参数范围。得到了迭代过程收敛域边界在系统参数空间的估计公式。同时,我们也证明了三维Navier-斯托克斯方程Cauchy问题的解析迭代解法的正确性。

英文摘要:

Some known results regarding the Euler and Navier-Stokes equations were obtained by different authors. Existence and smoothness of solutions for the Navier-Stokes equations in two dimensions have been known for a long time. Leray showed that the Navier-Stokes equations in three space dimensions have a weak solution. Scheffer and Shnirelman obtained weak solution of the Euler equations with compact support in spacetime. Caffarelli, Kohn and Nirenberg improved Scheffer's results, and F.-H. Lin simplified the proof of the results of J. Leray. Many problems and conjectures about behavior of weak solutions of the Euler and Navier-Stokes equations are described in the books of Bertozzi and Majda, Constantin or Lemarié-Rieusset. Solutions of the Navier-Stokes and Euler equations with initial conditions (Cauchy problem) for 2D and 3D cases were obtained in the convergence series form by analytical iterative method using Fourier and Laplace transforms in paper $\cite{TT10}$. These solutions were received in a form of infinitely differentiable functions, and that allows us to analyze all aspects of the problem on a much deeper level and with more details. Also such smooth solutions satisfy the conditions required in $\cite{CF06}$ for the problem of Navier-Stokes equations. For several combinations of problem parameters numerical results were obtained and presented as graphs $\cite{TT10}$,$\;\cite{TT11}$. This paper describes detailed proof of convergence of the analitical iterative method for solution of the Cauchy problem for the 3D Navier - Stokes equations. The convergence is shown for wide ranges of the problem's parameters. Estimated formula for the border of convergence area of the iterative process in the space of system parameters is obtained. Also we have provided justification of the analytical iterative method solution for Cauchy problem for the 3D Navier-Stokes equations.

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