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Axisymmetric self-similar solutions to the MHD equations without magnetic diffusion

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arxiv 2506.20131 v1 pith:PIRDG2OB submitted 2025-06-25 math.AP

classification math.AP
keywords mathbfaxisymmetricself-similarsolutionsboundaryconditiondiffusionequations
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abstract

We study the axisymmetric self-similar solutions $(\mathbf{u},\mathbf{B})$ to the stationary MHD equations without magnetic diffusion, where $\mathbf{B}$ has only the swirl component. Our first result states that in $\mathbb{R}^3\setminus\{0\}$, $\mathbf{u}$ is a Landau solution and $\mathbf{B}=0$. Our second result proves the triviality of axisymmetric self-similar solutions in the half-space $\mathbb{R}^3_+$ with the no-slip boundary condition or the Navier slip boundary condition.

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