2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/223478We say that the vanishing viscosity limit holds in the classical sense if the velocity for a solution to the Navier-Stokes equations converges in the energy norm uniformly in time to the velocity for a solution to the Euler equations. We prove, for a bounded domain in dimension 2 or higher, that the vanishing viscosity limit holds in the classical sense if and only if a vortex sheet forms on the boundary.Mathematical PhysicsAnalysis of PDEs76D05; 76B99; 76D99text