Asymptotic limits of the isentropic compressible viscous magnetohydrodynamic equations with Navier-slip boundary conditions

Asymptotic limits of the isentropic compressible viscous magnetohydrodynamic equations with Navier-slip boundary conditions
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纳维滑移边界条件下等熵可压缩粘性磁流体动力学方程的渐近极限

DOI:
10.1016/j.jde.2019.07.011
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发表时间:
2019-12
影响因子:
2.4
通讯作者:
Feng Xie
Feng Xie
中科院分区:
数学2区
文献类型:
--
作者:
Liang Guo;Fucai Li;Feng Xie

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本文讨论了三维有界区域Ω中等熵可压缩粘性磁流体动力学方程组在Navier滑移边界条件下的两类渐近极限。一个是不可压缩极限与准备不良的初始数据,另一个是无粘和不可压缩的组合极限与准备良好的初始数据。在第一种情况下,当马赫数为0时,当流体摩擦系数指数α 1≥ 1时,可压缩粘性磁流体动力学方程的弱解弱收敛到不可压缩粘性磁流体动力学方程的弱解.而且,在Ω和α 1≥ 12的几何假设下,速度在L2(0,∞; L2(Ω))中的收敛性确实是强的.在第二种情况下,我们证明了可压缩粘性磁流体动力学方程的弱解收敛到理想不可压缩磁流体动力学方程的局部强解。此外,还得到了收敛速度。
In this paper, two kinds of asymptotic limits to the isentropic compressible viscous magnetohydrodynamic equations in a three-dimensional bounded domain Ω with Navier-slip boundary conditions are discussed. One is the incompressible limit with ill-prepared initial data, and the other is the combined inviscid and incompressible limit with well-prepared initial data. In the first case, we show that the weak solutions of the compressible viscous magnetohydrodynamic equations converge weakly to the weak solutions of the incompressible viscous magnetohydrodynamic equations provided the index of the fluid friction coefficient α 1≥ 1 as the Mach number goes to 0. Moreover, the convergence of the velocity in L 2 (0,∞; L 2 (Ω)) is indeed strong under some geometrical assumptions on the domain Ω and α 1≥ 1 2. In the second case, we show that the weak solution of the compressible viscous magnetohydrodynamic equations converges to the local strong solution of the ideal incompressible magnetohydrodynamic equations. Furthermore, the convergence rates are also obtained.
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