Stabilization of needle-crystals in the symmetric model of solidification
Résumé
We present the results of a careful numerical analysis of the stability problem for stationary needle-crystal solutions of the symmetric model of dentritic solidification. The major outcome is that such needle crystals are stable, at least on a time scale relevant to side-branching phenomena. Our study also indicates that the tip of the needle-crystal is very sensitive to external noises, thus supporting the selective amplification mecanism advocated by Langer, Barbieri and Barber on the basis of a WKB analysis.
Origine : Fichiers produits par l'(les) auteur(s)