Asymptotic behavior of global vortex rings

In this paper, we are concerned with nonlinear desingularization of steady vortex rings in ${\mathbb{R}}^3$ with given general nonlinearity $f$. Using the improved vorticity method, we construct a family of steady vortex rings which constitute a desingularization of the classical circular vortex filament in the whole space. The requirements on $f$ are very general, and $f$ may have a simple discontinuity at the origin. Some qualitative and asymptotic properties are also established.