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The three-dimensional compressible magnetohydrodynamic (MHD) isentropic flow with zero magnetic diffusivity is studied. The vanishing magnetic diffusivity causes significant difficulties due to the loss of dissipation of the magnetic field.…

偏微分方程分析 · 数学 2011-08-30 Xiaoli Li , Ning Su , Dehua Wang

In this paper, two classes of exact analytic time-dependent soultion of magnetic annihilation for incompressible magnetic fluid, have been obtained by solving the magnetohydrodynamic (MHD) equations directly. The solutions derived here…

等离子体物理 · 物理学 2007-05-23 Xue-Shang Feng , Yong Liu , Feng-Si Wei , Zhan-Yin Ye

We investigate the incompressible inhomogeneous magnetohydrodynamic equations in $\mathbb{R}^3$, under the assumptions that the initial density $\rho_0$ is only bounded, and the initial velocity $u_0$ and magnetic field $B_0$ exhibit…

偏微分方程分析 · 数学 2025-01-14 Fucai Li , Jinkai Ni , Ling-Yun Shou

In this paper, we are concerned with the partial regularity of the suitable weak solutions to the fractional MHD equations in $\mathbb{R}^{n}$ for $n=2,\,3$. In comparison with the work of the 3D fractional Navier-Stokes equations obtained…

偏微分方程分析 · 数学 2016-09-21 Wei Ren , Yanqing Wang , Gang Wu

It is well known that the three-dimensional ideal magnetohydrodynamics (MHD) equations possess three magnetic invariants: (M) magnetic helicity, (C) cross helicity, and (P) the mean-square magnetic potential, in addition to the fundamental…

数学物理 · 物理学 2025-11-20 Naoki Sato , Ken Abe , Michio Yamada

Compressible ideal magnetohydrodynamics (MHD) is formulated in terms of the time evolution of potential vorticity and magnetic flux per unit mass using a compact Lie bracket notation. It is demonstrated that this simplifies analytic…

等离子体物理 · 物理学 2014-02-03 Wayne Arter

This paper concerns the Cauchy problem of two-dimensional (2D) full compressible magnetohydrodynamic (MHD) equations in the whole plane $\mathbb{R}^2$ with zero density at infinity. By spatial weighted energy method, we derive the local…

偏微分方程分析 · 数学 2022-05-18 Hong Chen , Xin Zhong

We present an exact analytic solution for decaying incompressible magnetohydrodynamic (MHD) turbulence. Our solution reveals a dual formulation in terms of two interacting Euler ensembles--one for hydrodynamic and another for magnetic…

流体动力学 · 物理学 2025-05-15 Alexander Migdal

In this article we consider the stability threshold of the 2D magnetohydrodynamics (MHD) equations near a combination of Couette flow and large constant magnetic field. We study the partial dissipation regime with full viscous and only…

偏微分方程分析 · 数学 2023-09-04 Niklas Knobel , Christian Zillinger

In this paper, we establish new $L^p$ gradient estimates of the solutions in order to discuss Cauchy problem for the full compressible magnetohydrodynamic(MHD) systems in $\mathrm{R}^3$. We use the "$\rm{div}-\rm{curl}$" decomposition…

偏微分方程分析 · 数学 2022-08-15 Chuanbao Wang , Fei Chen , Shuai Wang

The small data global well-posedness of the 3D incompressible Navier-Stokes equations in $\mathbb R^3$ with only one-directional dissipation remains an outstanding open problem. The dissipation in just one direction, say $\partial_1^2 u$ is…

偏微分方程分析 · 数学 2022-11-01 Hongxia Lin , Jiahong Wu , Yi Zhu

This paper concerns the Cauchy problem of the nonhomogeneous incompressible magnetohydrodynamic (MHD) equations on the whole two-dimensional (2D) space with vacuum as far field density. In particular, the initial density can have compact…

偏微分方程分析 · 数学 2015-06-17 Boqiang Lv , Zhonghai Xu , Xin Zhong

In this paper, we investigate the decay properties of axially symmetric solutions to the steady incompressible magnetohydrodynamic equations in $\mathbb{R}^3$ with finite Dirichlet integral. We first derive the decay rates of general…

偏微分方程分析 · 数学 2022-03-23 Shangkun Weng , Yan Zhou

This paper is devoted to the incompressible Magenetohydrodynamic equations in $\R^3$. We prove that if the difference between the magnetic field and the velocity is small initially then it will remain forever, thus results in global strong…

偏微分方程分析 · 数学 2015-06-16 Cheng He , Xiangdi Huang , Yun Wang

We settle the open question concerning the Harnack inequality for globally positive solutions to non-local in time diffusion equations by constructing a counter-example for dimensions $d\ge\beta$, where $\beta\in(0,2]$ is the order of the…

偏微分方程分析 · 数学 2018-06-13 Dominik Dier , Jukka Kemppainen , Juhana Siljander , Rico Zacher

We assemble the equations of general relativistic magnetohydrodynamics (MHD) in 3+1 form. These consist of the complete coupled set of Maxwell equations for the electromagnetic field, Einstein's equations for the gravitational field, and…

天体物理学 · 物理学 2009-11-07 Thomas W. Baumgarte , Stuart L. Shapiro

In this paper, we investigate the solvability, regularity and the vanishing dissipation limit of solutions to the three-dimensional viscous magneto-hydrodynamic (MHD) equations in bounded domains. On the boundary, the velocity field…

偏微分方程分析 · 数学 2020-07-07 Qin Duan , Yuelong Xiao , Zhouping Xin

In this paper, we prove the global existence of strong solutions to the two-dimensional compressible MHD equations with density dependent viscosity coefficients (known as Kazhikhov-Vaigant model) on 2D solid balls with arbitrary large…

偏微分方程分析 · 数学 2023-10-18 Xiangdi Huang , Wei Yan

We study the Moffatt's magnetic relaxation equation with Darcy-type regularization for the constitutive law. This is a topology-preserving dissipative equation, whose solutions are conjectured to converge in the infinite time limit towards…

偏微分方程分析 · 数学 2025-11-20 Sepehr Mohammadkhani , Huy Q. Nguyen

We prove the existence of both local and global smooth solutions to the Cauchy problem in $\R^3$ for the incompressible magnetohydrodynamics (MHD) system. We also prove that the solution to the incompressible MHD system can be obtained as…

偏微分方程分析 · 数学 2020-11-16 Anthony Suen