Abstract
We investigate the global well-posedness of strong solutions to the three-dimensional (3D) nonhomogeneous magnetohydrodynamic equations with density-dependent viscosity and vacuum. Combined energy method with the structure of the system under consideration, we obtain global existence and uniqueness of strong solutions provided that \(\Vert \rho _0\Vert _{L^1}+\Vert {\mathbf {b}}_0\Vert _{L^2}\) is suitably small. In particular, the initial velocity can be arbitrarily large. Moreover, we also derive exponential decay rates of the solution. As a direct application, we show global strong solutions for the 3D nonhomogeneous Navier–Stokes equations with density-dependent viscosity as long as the initial mass is properly small. This work improves Liu’s result (Z Angew Math Phys 70:Paper No. 107, 2019), where the author requires the smallness condition on \(\Vert \rho _0\Vert _{L^\infty }+\Vert {\mathbf {b}}_0\Vert _{L^3}\). Moreover, we also extend the local strong solutions obtained by Song (Z Angew Math Phys 69:Paper No. 23, 2018) to be a global one.
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Zhou, L., Tang, C.-L.: Global well-posedness to the 3D Cauchy problem of nonhomogeneous Navier–Stokes equations with density-dependent viscosity and large initial velocity (submitted for publication)
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This research was partially supported by National Natural Science Foundation of China (No. 11971393) and Postgraduate Research and Innovation Project of Chongqing (No. CYS22189)
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Zhou, L., Tang, CL. Global well-posedness to the 3D nonhomogeneous magnetohydrodynamic equations with density-dependent viscosity and large initial velocity. Z. Angew. Math. Phys. 73, 219 (2022). https://doi.org/10.1007/s00033-022-01852-3
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DOI: https://doi.org/10.1007/s00033-022-01852-3
Keywords
- Nonhomogeneous magnetohydrodynamic equations
- Global well-posedness
- Density-dependent viscosity
- Large initial velocity