2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/143339We describe the Hamiltonian structures, including the Poisson brackets and Hamiltonians, for free boundary problems for incompressible fluid flows with vorticity. The Hamiltonian structure is used to obtain variational principles for stationary gravity waves both for irrotational flows as well as flows with vorticity.20 pagesMathematical Physics35Q20, 35Q35text