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ICLASS 94<br>Proceedings of the Sixth International Conference on Liquid Atomization and Spray Systems

ISBN:
978-1-56700-019-1 (Print)
978-1-56700-445-5 (Online)

DIRECT NUMERICAL SIMULATION OF INTERFACE BREAKUP AND ATOMISATION

F.X. Keller
CORIA, CNRS, URA 230, Mt-St-Aignan, France

J. Li
Universite Pierre et Marie Curie, Paris, France

ariane vallet
Irstea

D. Vandromme
CORIA, CNRS, URA 230, Mt-St-Aignan, France

S. Zaleski
Institut d'Alembert, Tour 55, case 162, UPMC 7525, Paris Cedex 05, France

Abstract

Numerical studies of the breakup of sheared liquid−gas interfaces subject to the Kelvin−Helmholtz instability are described. The incompressible Navier−Stokes equations are solved on a Marker And Cell (MAC) staggered finite-difference grid together with a projection algorithm for the pressure. For the kinematics of the interface a second order scheme is used. Surface tension is modeled by a scheme that conserves momentum exactly in the discretized equations. This enables to follow droplet formation and ejection away from the liquid layer. Droplet ejection occurs at much higher Weber and Reynolds numbers than predicted by linear theory. The precise mechanism involves formation and detachment of a boundary layer.