Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9690616 | European Journal of Mechanics - B/Fluids | 2005 | 14 Pages |
Abstract
In this paper we study the transition from a deep to a shallow water layer and the formation of quasi-two-dimensional vortex dynamics. Vortices are experimentally generated by a circular horizontal turbulent pulsed jet. The dimensional analysis gives two relevant dimensionless parameters: the jet Reynolds number Re and a number C which characterizes the vertical confinement. They are respectively defined by Re=Q/ν and C=(Q/H2)tinj (H is the water depth, ν is the kinematical viscosity, Q the injected momentum flux and tinj the injection duration). Experimental results show a strong influence of C on the flow: when C<1, the evolution is a typical three-dimensional turbulence decay, while when C>2 we observe the formation of large vortex dipoles. However these dipoles are not strictly two-dimensional because of the presence of a vertical circulation in the front of the dipole. Results are independent of the jet Reynolds number in the range 1000
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Damien Sous, Natalie Bonneton, Joel Sommeria,