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Laser-induced evolution of hypocycloidal formation of vortex filaments from nonlinear Rayleigh–Taylor instability in a thin layer of molten metal

Authors :
Stjepan Lugomer
Aleksandar Maksimović
Source :
Journal of Applied Physics. 84:4684-4692
Publication Year :
1998
Publisher :
AIP Publishing, 1998.

Abstract

A tiny vortex filament, the self-organization of which follows the contour of the nonlinear Rayleigh–Taylor (RT) instability was generated by the Gaussian laser pulse on a ns time scale. Vortex filament self-organization on the nonplanar target surface follows the asymmetric RT evolution consisting of the compressed half of the hypocycloide whose cusps have evolved into spikes, and of the other half whose cusps have evolved into loops. Since the loops cannot be formed, the filaments break into short sets of parallel rolls, oriented in radial direction. The asymmetric contour of the filament self-organization was reproduced by the two-dimensional multimode model that gives the analytical solution, based on the model of Ott. The asymmetry in the vortex filament self-organization is generated by the random wave number mode values, and by the specific phase relations between the modes.

Details

ISSN :
10897550 and 00218979
Volume :
84
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi.dedup.....649a1432ebd2e9c368d06046cf1275e2
Full Text :
https://doi.org/10.1063/1.368711