Mean Field Equation for Vortex Filament Systems

Ken Sawada, Takashi Suzuki
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Abstract

We consider vortex filament systems which is regarded as a three dimensional extension of the point vortex system introduced by Onsager to investigate the 2D turbulence. We show that this system is equipped with a dual variational structure as in the case of the point vortex system, and that the mean field equations for the system in terms of the stream function and the vorticity are derived from a Lagrangian. In addition, we discuss the existence of solutions to the mean field equations.
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涡丝系统的平均场方程
我们将涡丝系统作为Onsager引入的点涡系统的三维扩展来研究二维湍流。我们证明了该系统具有与点涡系统一样的对偶变分结构,并且该系统的流函数和涡度的平均场方程是由拉格朗日量导出的。此外,我们还讨论了平均场方程解的存在性。
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