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arXiv math/0406297math.APmath-phmath.MP
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二维Navier-斯托克斯方程初涡量的唯一性

Uniqueness for the two-dimensional Navier-Stokes equation with a measure as initial vorticity

Isabelle Gallagher, Thierry Gallay

摘要:

我们证明了涡量分布在$L^1(R^2)$中有界的二维Navier-斯托克斯方程的任何解完全由在$t = 0$的涡量迹所决定,而$t = 0$是一个有限的测度。当结合以前的存在性结果由Cottet,Giga,Miyakawa,Osada,和加藤,这个唯一性属性意味着涡度方程的柯西问题在$R^2$是全球性的有限措施的空间。特别是,这提供了一个例子的情况下,Navier-斯托克斯方程是适定的任意数据在函数空间是足够大,以包含一些自相似的解决方案的初始数据。

英文摘要:

We show that any solution of the two-dimensional Navier-Stokes equation whose vorticity distribution is uniformly bounded in $L^1(R^2)$ for positive times is entirely determined by the trace of the vorticity at $t = 0$, which is a finite measure. When combined with previous existence results by Cottet, by Giga, Miyakawa, and Osada, and by Kato, this uniqueness property implies that the Cauchy problem for the vorticity equation in $R^2$ is globally well-posed in the space of finite measures. In particular, this provides an example of a situation where the Navier-Stokes equation is well-posed for arbitrary data in a function space that is large enough to contain the initial data of some self-similar solutions.

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