Interface dynamics in Hele-Shaw flows with centrifugal forces. Preventing cusp singularities with rotation

Details Interface dynamics in Hele-Shaw flows with centrifugal forces. Preventing cusp singularities with rotation Interface dynamics in Hele-Shaw flows with centrifugal forces. Preventing cusp singularities with rotation

1999-10-08

arxiv.org/abs/cond-mat/9910127v1

Phys. Rev. E 62 (2000) R5887-R5890

Physics

Condensed Matter

4 pages, 2 figures

Scientific paper

10.1103/PhysRevE.62.R5887

A class of exact solutions of Hele-Shaw flows without surface tension in a rotating cell is reported. We show that the interplay between injection and rotation modifies drastically the scenario of formation of finite-time cusp singularities. For a subclass of solutions, we show that, for any given initial condition, there exists a critical rotation rate above which cusp formation is prevented. We also find an exact sufficient condition to avoid cusps simultaneously for all initial conditions. This condition admits a simple interpretation related to the linear stability problem.

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