Vortex Flows and Related Numerical Methods II
ESAIM: Proceedings,
Vol. 1, 1996, pp. 539-552
Three-Dimensional Vorticity Dynamics
in a Swirling Jet
J.E. Martin
Department of Mathematics
Christopher Newport University
Newport News, VA 23606-2998, USA
E. Meiburg
Department of Aerospace Engineering
University of Southern California
Los Angeles, CA 90089-1191, USA
Abstract
Three-dimensional aspects of vorticity concentration, reorientation, and
stretching are investigated in a simplified swirling jet model, consisting
of a line vortex along the jet axis surrounded by a jet shear layer with
both azimuthal and streamwise vorticity. Inviscid three-dimensional vortex
dynamics simulations demonstrate the nonlinear interaction and competition
between a centrifugal instability and Kelvin-Helmholtz instabilities
feeding on both components of the base flow vorticity. The nonlinear
evolution of the flow depends strongly on the initial ratio of the
azimuthal and axisymmetric perturbation amplitudes. The long term dynamics
of the jet can be dominated by counterrotating vortex rings connected by
braid vortices, by like-signed rings and streamwise braid vortices, or by
wavy streamwise vortices alone.
Vortex Flows and Related
Numerical Methods II
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