Clustered helical vortices for 3D incompressible Euler equation in infinite cylinders

Daomin Cao, Jie Wan

In this article, we first consider solutions to a semilinear elliptic problem in divergence form \begin{equation*} \begin{cases} -\varepsilon^2\text{div}(K(x)\nabla u)= (u-q|\ln\va…