Uniform attractors for three-dimensional Navier–Stokes equations with nonlinear damping

Uniform attractors for three-dimensional Navier–Stokes equations with nonlinear damping
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具有非线性阻尼的三维纳维斯托克斯方程的均匀吸引子

DOI:
10.1016/j.jmaa.2014.08.044
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发表时间:
2015-02
影响因子:
1.3
通讯作者:
Yanren Hou
Yanren Hou
中科院分区:
数学3区
文献类型:
--
作者:
Xueli Song;Yanren Hou

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研究了三维有界区域上具有非线性阻尼项的三维非自治Navier-Stokes方程。当外力f0(x,t)在Lloc 2(R; H)中是平移紧的,α> 0,72 ≤ β≤ 5,初值u τ∈ V时,给出了解的一系列一致估计.基于这些估计,我们证明了过程族{Uf(t,τ)},f∈ H(f0),是(V× H(f0),V)-连续的.同时,利用Ascoli-Arzela定理证明了{Uf(t,τ)},f∈ H(f0),是(V,H2(Ω))-一致紧的.利用半过程理论,得到了(V,V)-一致吸引子和(V,H2(Ω))-一致吸引子的存在性.证明了(V,V)-一致吸引子实际上是(V,H2(Ω))-一致吸引子.
This paper is concerned with the three-dimensional non-autonomous Navier–Stokes equation with nonlinear damping in 3D bounded domains. When the external force f 0 (x, t) is translation compact in L loc 2 (R; H), α> 0, 7 2≤ β≤ 5 and initial data u τ∈ V, we give a series of uniform estimates on the solutions. Based on these estimates, we prove the family of processes {U f (t, τ)}, f∈ H (f 0), is (V× H (f 0), V)-continuous. At the same time, by making use of Ascoli–Arzela theorem, we find {U f (t, τ)}, f∈ H (f 0), is (V, H 2 (Ω))-uniformly compact. So, using semiprocess theory, we obtain the existence of (V, V)-uniform attractor and (V, H 2 (Ω))-uniform attractor. And we prove the (V, V)-uniform attractor is actually the (V, H 2 (Ω))-uniform attractor.
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