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arXiv 2409.07802math.AP
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带霍尔效应的广义Navier-Stokes-Maxwell方程的适定性、磁螺旋度守恒、无粘极限与渐近稳定性

Well-posedness, magnetic helicity conservation, inviscid limit and asymptotic stability for the generalized Navier-Stokes-Maxwell equations with the Hall effect

Kyungkeun Kang, Jihoon Lee, Dinh Duong Nguyen

AI总结:

本文研究带霍尔效应的广义Navier-Stokes-Maxwell方程的适定性、磁螺旋度守恒、无粘极限与渐近稳定性,证明了粘性小初值全局适定、无粘大初值局部适定等结果,明确了其与霍尔磁流体系统的渐近联系及磁螺旋度守恒的条件差异。

摘要:

本文致力于研究二维和三维空间中带霍尔效应的广义Navier-Stokes-Maxwell方程(NSM)的适定性、磁螺旋度的(条件)守恒性、无粘极限与渐近稳定性。具体而言,在粘性情形下,我们证明了小初值条件下NSM的全局适定性,这一结果使我们得以建立两种渐近联系:当光速趋于无穷时,该系统对应Hall-magnetohydrodynamics(H-MHD,霍尔磁流体动力学)系统;当霍尔系数趋于零时,该系统对应无霍尔项的NSM。此外,在无粘情形下,针对可能的大初值,我们也得到了NSM的局部适定性。再者,在三维空间中,对NSM的初值施加合适条件、并对解附加额外假设的前提下,当电导率趋于无穷时磁螺旋度守恒。这一特性与速度场和磁场均带临界分数阶拉普拉斯指数的分数阶H-MHD情形不同,后者仅需光滑初值、无需对解附加任何额外条件即可保证磁螺旋度守恒。此外,在存在速度阻尼项的情形下,我们建立了NSM在常磁场附近的渐近稳定性。

英文摘要:

This paper is devoted to studying the well-posedness, (conditional) conservation of magnetic helicity, inviscid limit and asymptotic stability of the generalized Navier-Stokes-Maxwell equations (NSM) under the Hall effect in two and three dimensions. More precisely, in the viscous case we prove the global well-posedness of NSM for small initial data, which allows us to establish a connection with either the Hall-magnetohydrodynamics (H-MHD) system as the speed of light tends to infinity or NSM without the Hall coefficient as this constant goes to zero. In addition, in the inviscid case the local well-posedness of NSM is also obtained for possibly large initial data. Moreover, under suitable conditions on the initial data and additional assumptions of solutions to NSM in three dimensions, the magnetic helicity is conserved as the electric conductivity goes to infinity. It is different to the case of the fractional H-MHD with critical fractional Laplacian exponents for both the velocity and magnetic fields, where the conservation of magnetic helicity can be provided for smooth initial data without any further conditions on the solution. Furthermore, the asymptotic stability of NSM around a constant magnetic field is established in the case of having a velocity damping term.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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