Author(s): P. Espa; M. Gallati; S. Sibilla

Linked Author(s):

Keywords: Turbulent plane jet; Flapping; Surface waves; SPH technique

Abstract: This paper describes the numerical investigation of an upward plane jet vertically impinging onto the free surface of a relatively small depth water environment. In the range of examined jet velocities and water depths, the interaction of the jet with the free surface strongly affects the flow development. Gradually increasing the inlet jet velocity, a stable and symmetric blowing-up on the water surface is first observed. As the inlet velocity reaches a critical value the jet starts to flap with a characteristic frequency and the mentioned blowingup follows synchronically the jet flapping; the surface oscillations propagate then away from the jet in the form of surface waves. The hydro-dynamics of such a complex flow has so far received little attention and is still poorly understood. The main aim of this work is to investigate the possibility of studying it with the aid of CFD. The presence of rapidly moving boundaries has led to adopt a Lagrangian approach for the simulations. The solution method is based on the Smoothing Particle Hydrodynamics (SPH) interpolation technique and has been used to successfully model rapidly varied free surface water flows. The numerical results are compared with experimental data collected by the Authors and recently published.

DOI:

Year: 2003