title: Lateral instability in normal viscous fingers.
abstract: We 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.
authors.affiliation: Departamento de Física y Química Teórica, Facultad de Química, UNAM Ciudad Universitaria, Mexico DF 04510, Mexico.
authors.forename: R
authors.initials: R
authors.lastname: Ledesma-Aguilar
authors.forename: M
authors.initials: M
authors.lastname: Quevedo-Reyes
authors.forename: E
authors.initials: E
authors.lastname: Corvera Poiré
authors.forename: A
authors.initials: A
authors.lastname: Hernández-Machado