2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/220369With the previous results for the analytical blowup solutions of the N-dimensional Euler-Poisson equations, we extend the similar structure to construct an analytical family of solutions for the isothermal Navier-Stokes equations and pressureless Navier-Stokes equations with density-dependent viscosity.13 pages, Typos are correctedMathematical PhysicsAnalysis of PDEs35Q30text