MIDIT OFD CATS Modelling, Nonlinear Dynamics Optics and Fluid Dynamics Chaos and Turbulence Studies and Irreversible Thermodynamics Risø National Laboratory Niels Bohr Institute and Technical University of Denmark Building 128 Department of Chemistry Building 321 P.O. Box 49 University of Copenhagen DK-2800 Lyngby DK-4000 Roskilde DK-2100 Copenhagen Ø Denmark Denmark Denmark
by Shinya Watanabe
Dept. of Mathematical Sciences
Ibaraki University
Mito, Japan
MIDIT-seminar 464
Tuesday September 14, 1999, 15.00 h
at MIDIT, IMM Building 305, room 027
Abstract: When a liquid jet comes out of a vertical nozzle and impinges upon a horizontal surface, a ring discontinuity (the circular hydraulic jump) is observed at some radius from the jet. By using a more viscous liquid, it was found fairly recently that the familiar jump can change its shape spontaneously into stationary polygons with various numbers of corners, breaking the axial symmetry. I plan to introduce the surprising observation, and present one heuristic explanation of the beautiful states.