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arXiv 2102.12288math.AP
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带密度相关黏度和真空的二维非齐次Navier-Stokes方程与磁流体动力学方程的全局适定性和指数衰减性

Global well-posedness and exponential decay of 2D nonhomogeneous Navier-Stokes and magnetohydrodynamic equations with density-dependent viscosity and vacuum

Xin Zhong

AI总结:

该研究在二维有界区域中证明了带密度相关黏度、含真空的非齐次MHD方程强解的全局适定性与指数衰减性,无需初始数据相容性条件,且该结论可推广至同类非齐次Navier-Stokes方程。

摘要:

我们在二维有界区域中,建立了带密度相关黏度且初始密度允许为零的非齐次magnetohydrodynamic(磁流体动力学,MHD)方程强解的全局适定性。通过精细的能量估计与Desjardins插值不等式,在$\|\ ablaμ(ρ_0)\|_{L^q}$适当小的条件下,我们推导出唯一强解的全局存在性。此外,我们还得到了解的指数衰减速率。特别地,尽管存在真空,也无需对初始数据施加任何相容性条件。作为直接应用,我们证明类似结果对带密度相关黏度的非齐次Navier-Stokes方程同样成立。

英文摘要:

We establish global well-posedness of strong solutions for the nonhomogeneous magnetohydrodynamic equations with density-dependent viscosity and initial density allowing vanish in two-dimensional (2D) bounded domains. Applying delicate energy estimates and Desjardins' interpolation inequality, we derive the global existence of a unique strong solution provided that $\|\nablaμ(ρ_0)\|_{L^q}$ is suitably small. Moreover, we also obtain exponential decay rates of the solution. In particular, there is no need to impose some compatibility condition on the initial data despite the presence of vacuum. As a direct application, it is shown that the similar result also holds for the nonhomogeneous Navier-Stokes equations with density-dependent viscosity.

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