Analytical Model of Motion of Turbulent Vortex Rings in an Incompressible Fluid
V. V. Nikulin
Lavrent'ev Institute of Hydrodynamics, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
Keywords: vortex ring, buoyant vortex, turbulence
Abstract
An analytical model describing the motion of vortex rings in an incompressible fluid is constructed. The model is valid both for homogeneous and inhomogeneous vortices buoyant in the gravity field, as well as for combined vortices. The expansion angle of the buoyant vortex is found through characteristic parameters that define the flow rather than specified on the basis of experiments. Significant differences in the expansion angles of homogeneous and buoyant vortex rings are explained. The calculation results for the proposed model are compared with the results of laboratory experiments and data on rising of the cloud formed by an atomic explosion.
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