Global existence and decay estimate of solutions to magneto-micropolar fluid equations

Global existence and decay estimate of solutions to magneto-micropolar fluid equations
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磁微极性流体方程解的全局存在性和衰变估计

DOI:
10.1016/j.jde.2018.09.027
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发表时间:
2019-03
期刊:
J. Differential Equations
影响因子:
--
通讯作者:
Zhou Jianfeng
Zhou Jianfeng
中科院分区:
其他
文献类型:
--
作者:
Tan Zhong;Wu Wenpei;Zhou Jianfeng

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我们研究磁微极流体方程(1.3)-(1.4)。在一定条件下研究了柯西问题解的整体存在性。精确地说,对于磁微极Navier-Stokes(MMNS)系统,我们得到了在R3中常数态附近解的整体存在性和大时间行为。借助于精化的纯能量方法,我们首先假设初始数据的H3范数很小,但高阶导数可以任意大,得到了一个整体解的存在性定理.当初值为齐次Sobolev范数H stec − s(0≤ s< 3 2)或齐次Besov范数B stec 2,∞− s(0< s≤ 3 2)时,得到了解及其高阶导数的最优衰减率.作为直接的副产品,我们还得到了通常的Lp − L2(1≤ p≤ 2)型衰减率,而不需要初始数据的Lp范数很小。最后,在大初值条件下,得到了方程(1.3)-(1.4)在R2中的弱解.
We are concerned with magneto-micropolar fluid equations (1.3)–(1.4). The global existence of solutions to the Cauchy problem is investigated under certain conditions. Precisely, for the magneto-micropolar-Navier–Stokes (MMNS) system, we obtain global existence and large time behavior of solutions near a constant states in R 3. Appealing to a refined pure energy method, we first obtain a global existence theorem by assuming that the H 3 norm of the initial data is small, but the higher order derivatives can be arbitrary large. If the initial data belongs to homogeneous Sobolev norms H˙− s (0≤ s< 3 2) or homogeneous Besov norms B˙ 2,∞− s (0< s≤ 3 2), we obtain the optimal decay rates of the solutions and its higher order derivatives. As an immediate byproduct, we also obtain the usual L p− L 2 (1≤ p≤ 2) type of the decay rates without requiring that the L p norm of initial data is small. At last, we derive a weak solution to (1.3)–(1.4) in R 2 with large initial data.
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