Lifespan of Solutions to MHD Boundary Layer Equations with Analytic Perturbation of General Shear Flow

Lifespan of Solutions to MHD Boundary Layer Equations with Analytic Perturbation of General Shear Flow
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一般剪切流解析摄动的 MHD 边界层方程解的寿命

DOI:
10.1007/s10255-019-0805-y
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发表时间:
2019-01
影响因子:
0.8
通讯作者:
Yang Tong
Yang Tong
中科院分区:
数学4区
文献类型:
--
作者:
Xie Feng;Yang Tong

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本文将MHD边界层系统的解的寿命看作是一般剪切流的解析摄动。利用文[12]中所观察到的系统中的抵消机制,证明了当微扰强度为ε−量级时,解的寿命按−量级为ε。由于对剪切流的强度没有限制,寿命估计值比经典Prandtl系统的估计值要大,从而揭示了磁场对边界附近导电流体的稳定化作用。
In this paper, we consider the lifespan of solution to the MHD boundary layer system as an analytic perturbation of general shear flow. By using the cancellation mechanism in the system observed in [12], the lifespan of solution is shown to have a lower bound in the order ofε−2−if the strength of the perturbation is of the order ofε. Since there is no restriction on the strength of the shear flow and the lifespan estimate is larger than the one obtained for the classical Prandtl system in this setting, it reveals the stabilizing effect of the magnetic field on the electrically conducting fluid near the boundary.
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