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三维轴对称Navier-斯托克斯方程的动力稳定性

Dynamic Stability of the 3D Axi-symmetric Navier-Stokes Equations with Swirl

Thomas Y. Hou, Congming Li

摘要:

本文研究了三维轴对称Navier-斯托克斯方程在涡旋作用下的动力稳定性。为此,我们提出了一个新的一维(1D)模型,它近似的Navier-斯托克斯方程沿对称轴。这个一维模型的一个重要性质是可以从它的解构造出三维Navier-斯托克斯方程的一族精确解。一维模型的非线性结构具有一些非常有趣的性质。一方面,它可以在短时间内导致解决方案的巨大动态增长。另一方面,它有一个令人惊讶的动态耗尽机制,可以防止溶液在有限时间内爆炸。利用这种特殊的非线性结构,我们证明了三维Navier-斯托克斯方程对于一族初始数据的全局正则性,其解可以导致大的动态增长,但仍然具有全局光滑解.

英文摘要:

In this paper, we study the dynamic stability of the 3D axisymmetric Navier-Stokes Equations with swirl. To this purpose, we propose a new one-dimensional (1D) model which approximates the Navier-Stokes equations along the symmetry axis. An important property of this 1D model is that one can construct from its solutions a family of exact solutions of the 3D Navier-Stokes equations. The nonlinear structure of the 1D model has some very interesting properties. On one hand, it can lead to tremendous dynamic growth of the solution within a short time. On the other hand, it has a surprising dynamic depletion mechanism that prevents the solution from blowing up in finite time. By exploiting this special nonlinear structure, we prove the global regularity of the 3D Navier-Stokes equations for a family of initial data, whose solutions can lead to large dynamic growth, but yet have global smooth solutions.

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