REMARK ON UNIQUENESS OF WEAK SOLUTIONS TO THE NAVIER-STOKES EQUATIONS

REMARK ON UNIQUENESS OF WEAK SOLUTIONS TO THE NAVIER-STOKES EQUATIONS
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DOI:
10.1524/anly.1996.16.3.255
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发表时间:
1996
期刊:
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影响因子:
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通讯作者:
H. Kozono;H. Sohr
H. Kozono;H. Sohr
中科院分区:
其他
文献类型:
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作者:
H. Kozono;H. Sohr

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(n) du -非盟在χ+ u•Vu + Vp = / eΩ,0 < t <Τ,在χeΩdiv u = 0, 0 < t < 3日Τu = 0Ω,w | t = o,在u = u (x, t) =(«”(χ,我 ), · · •, u (x, t))和ρ= p (x, t)表示未知的速度矢量和压力的液体在点(x, t)€Ωχ(0,t),而α= (x) = ((x)、•••(x))是给定的初始速度矢量场;/ = f(x, t) = (f l {x, t),••••,f(x, t))是给定的外力。本文的目的是改进在¿°°(0,Γ;£(Ω))类中(N-S)弱解的唯一性判据。我们知道,对于每一个G Ζ£(Ω)和每一个/ e¿'(Ο,T; L(ù)),存在至少一个(N-S)的弱解u满足能量不等式。这里我们用弱解来表示在L°°(0,Τ; Ζ^(Ω)) Π中的函数u l2 (0, T; H ^ m在分布意义上满足(N-S)(第1节的定义)。能量不等式见下文(1.1)。
(N-S) du — Au + u • Vu + Vp = / in χ e Ω, 0 < t < Τ, at div u = 0 in χ e Ω, 0 < t < Τ, u = 0 on 3Ω, w|t=o a, where u = u(x,t) = («'(χ, i), · · •, u(x, t)) and ρ = p(x,t) denote the unknown velocity vector and pressure of the fluid at the point (x,t) € Ω χ (0,T), while α = a(x) = (a(x), • ••, a(x)) is the given initial velocity vector field; / = f(x, t) = ( f l { x , t), • • •, f(x, t)) is a given external force. The purpose of the present paper is to improve the criterion on uniqueness of weak solutions to (N-S) in the class ¿°°(0,Γ; £(Ω)). We know that for every a G Ζ£(Ω) and every / e ¿'(Ο,T; L(ù)), there exists at least one weak solution u of (N-S) satisfying the energy inequality. Here we mean by the weak solution a function u in L°°(0, Τ; Ζ^(Ω)) Π L 2 ( 0 , T ; H ^ m satisfying (N-S) in the sense of distributions (Definition of Section 1). For the energy inequality, see (1.1) below.