Uniqueness of Mild Solutions to the Navier-Stokes Equations in Weak-type \(L^d\) Space

IF 1.3 3区 数学 Q2 MATHEMATICS, APPLIED
Zhirun Zhan
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引用次数: 0

Abstract

This paper deals with the uniqueness of mild solutions to the forced or unforced Navier-Stokes equations in the whole space. It is known that the uniqueness of mild solutions to the unforced Navier-Stokes equations holds in \(L^{\infty }(0,T;L^d({\mathbb {R}}^d))\) when \(d\ge 4\), and in \(C([0,T];L^d({\mathbb {R}}^d))\) when \(d\ge 3\). As for the forced Navier-Stokes equations, when \(d\ge 3\) the uniqueness of mild solutions in \(C([0,T];L^{d,\infty }({\mathbb {R}}^d))\) with force f and initial data \(u_{0}\) in appropriate Lorentz spaces is known. In this paper we show that for \(d\ge 3\), the uniqueness of mild solutions to the forced Navier-Stokes equations in \( C((0,T];{\widetilde{L}}^{d,\infty }({\mathbb {R}}^d))\cap L^\beta (0,T;{\widetilde{L}}^{d,\infty }({\mathbb {R}}^d))\) for \(\beta >2d/(d-2)\) holds when there is a mild solution in \(C([0,T];{\widetilde{L}}^{d,\infty }({\mathbb {R}}^d))\) with the same initial data and force. Here \({\widetilde{L}}^{d,\infty }\) is the closure of \({L^{\infty }\cap L^{d,\infty }}\) with respect to \(L^{d,\infty }\) norm.

弱型\(L^d\)空间中Navier-Stokes方程温和解的唯一性
研究了强迫或非强迫Navier-Stokes方程温和解在整个空间中的唯一性。已知非强迫Navier-Stokes方程温和解的唯一性在\(L^{\infty }(0,T;L^d({\mathbb {R}}^d))\)当\(d\ge 4\)成立,在\(C([0,T];L^d({\mathbb {R}}^d))\)当\(d\ge 3\)成立。对于强迫Navier-Stokes方程,当\(d\ge 3\)在适当的洛伦兹空间中,已知\(C([0,T];L^{d,\infty }({\mathbb {R}}^d))\)中具有力f和初始数据\(u_{0}\)的温和解的唯一性。在本文中,我们证明了对于\(d\ge 3\),当在\(C([0,T];{\widetilde{L}}^{d,\infty }({\mathbb {R}}^d))\)中存在具有相同初始数据和力的温和解时,\(\beta >2d/(d-2)\)中\( C((0,T];{\widetilde{L}}^{d,\infty }({\mathbb {R}}^d))\cap L^\beta (0,T;{\widetilde{L}}^{d,\infty }({\mathbb {R}}^d))\)中强制Navier-Stokes方程温和解的唯一性是成立的。这里\({\widetilde{L}}^{d,\infty }\)是\({L^{\infty }\cap L^{d,\infty }}\)相对于\(L^{d,\infty }\)范数的闭包。
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来源期刊
CiteScore
2.00
自引率
15.40%
发文量
97
审稿时长
>12 weeks
期刊介绍: The Journal of Mathematical Fluid Mechanics (JMFM)is a forum for the publication of high-quality peer-reviewed papers on the mathematical theory of fluid mechanics, with special regards to the Navier-Stokes equations. As an important part of that, the journal encourages papers dealing with mathematical aspects of computational theory, as well as with applications in science and engineering. The journal also publishes in related areas of mathematics that have a direct bearing on the mathematical theory of fluid mechanics. All papers will be characterized by originality and mathematical rigor. For a paper to be accepted, it is not enough that it contains original results. In fact, results should be highly relevant to the mathematical theory of fluid mechanics, and meet a wide readership.
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