Entropy-bounded solutions to the 3D compressible heat-conducting magnetohydrodynamic equations with vacuum at infinity

Entropy-bounded solutions to the 3D compressible heat-conducting magnetohydrodynamic equations with vacuum at infinity
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无穷远真空下 3D 可压缩导热磁流体动力学方程的熵有界解

DOI:
10.1016/j.jde.2023.02.020
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发表时间:
2022-05
影响因子:
2.4
通讯作者:
Xin Zhong
Xin Zhong
中科院分区:
数学2区
文献类型:
--
作者:
Yang Liu;Xin Zhong

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真空区附近粘性、可压缩、热传导磁流体动力学流的熵行为的数学分析是一个具有挑战性的问题,因为熵的控制方程在真空区是高度退化和奇异的。在我们以前的工作[38]中,我们研究了在无穷远处具有真空的三维可压缩热传导磁流体动力学方程强解的整体存在性。然而,熵是否保持其有界性还是未知的?因此,本文的主要新奇在于对这一问题给予了积极的回应。事实上,我们表明,一致的有界性的熵和L2的速度和温度的传播,提供了初始密度衰减适当缓慢在无穷远。改进的De Giorgi型迭代技术和有用的奇异加权估计推导出的熵的上下界。
The mathematical analysis on the behavior of the entropy for viscous, compressible, and heat conducting magnetohydrodynamic flows near the vacuum region is a challenging problem as the governing equation for entropy is highly degenerate and singular in the vacuum region. In our previous work [38], we investigate the global existence of strong solutions to the three-dimensional (3D) compressible heat-conducting magnetohydrodynamic equations with vacuum at infinity. However, it is unknown whether the entropy remains its boundedness or not? Thus, the main novelty of this paper is to give a positive response to this problem. In fact, we show that the uniform boundedness of the entropy and the L 2 regularities of the velocity and temperature can be propagated provided that the initial density decays suitably slow at infinity. Modified De Giorgi type iteration techniques and useful singularly weighted estimates are developed to deduce the lower and upper bounds on the entropy.
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