Ledesma Aguilar, Rodrigo AndrésQuevedo-Reyes, M.Corvera Poiré, EugeniaHernández Machado, Aurora2011-07-072011-07-0720051539-3755https://hdl.handle.net/2445/18701We study a low-amplitude, long-wavelength lateral instability of the Saffman-Taylor finger by means of a phase-field model. We observe such an instability in two situations in which small dynamic perturbations are overimposed to a constant pressure drop. We first study the case in which the perturbation consists of a single oscillatory mode and then a case in which the perturbation consists of temporal noise. In both cases the instability undergoes a process of selection.7 p.application/pdfeng(c) The American Physical Society, 2005Dinàmica de fluidsViscositatFluid dynamicsViscosityinfo:eu-repo/semantics/article561754info:eu-repo/semantics/openAccess