Growth of unstable interfaces in disordered media
The effects of a disordered medium in the growth of unstable interfaces are studied by means of two local models with multiplicative and additive quenched disorder, respectively. For short times and large pushing the multiplicative quenched disorder is equivalent to a time-dependent noise. In this r...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 1998 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/2596 |
| Acceso en línea: | https://hdl.handle.net/2117/2596 https://dx.doi.org/10.1103/PhysRevE.57.5754 |
| Access Level: | acceso abierto |
| Palabra clave: | Nonlinear systems Nonlinear dynamics Interfaces Disorder Morphological instability Sistemes no lineals Àrees temàtiques de la UPC::Física |
| Sumario: | The effects of a disordered medium in the growth of unstable interfaces are studied by means of two local models with multiplicative and additive quenched disorder, respectively. For short times and large pushing the multiplicative quenched disorder is equivalent to a time-dependent noise. In this regime, the linear dispersion relation contains a destabilizing contribution introduced by the noise. For long times, the interface always gets pinned. We model the systematics of the pinned shapes by means of an effective nonlinear model. These results show good agreement with numerical simulations. For the additive noise we find numerically that a depinning transition occurs. |
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