2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/142595We prove new \emph{a priori} estimates for the 3D Euler, the 3D Navier-Stokes and the 2D quasi-geostrophic equations by the method of similarity transforms.Analysis of PDEs35Q30, 76B03, 76D05On the a priori estimates for the Euler, the Navier-Stokes and the quasi-geostrophic equationstext