Session A28: Free-Surface Flows I

8:00 AM–9:57 AM, Sunday, November 24, 2013
Room: Spirit of Pittsburgh Ballroom B/C

Chair: Julie Crockett, Bringham Young University

Abstract ID: BAPS.2013.DFD.A28.6

Abstract: A28.00006 : Spinning hydraulic jump

9:05 AM–9:18 AM

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  Hamid Abderrahmane

  Aslan Kasimov

We report an experimental observation of a new symmetry breaking of circular hydraulic jump into a self-organized structure that consists of a spinning polygonal jump and logarithmic-spiral waves of fluid elevation downstream. The waves are strikingly similar to spiral density waves in galaxies. The fluid flow exhibits counterparts of salient morphological features of galactic flows, in particular the outflow from the center, jets, circum-nuclear rings, gas inflows toward the galactic center, and vortices. The hydrodynamic instability revealed here may have a counterpart that plays a role in the formation and sustainability of spiral arms in galaxies.

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