An experimental and theoretical investigation of the flow at the outlet of a Francis turbine
runner is carried out in order to elucidate the causes of a sudden drop in the draft tube …

This work presents a detailed analysis of the three-dimensional flows in a Pump-as-Turbine
(PaT). The flow field is studied through URANS simulations and a velocity vector analysis …

In hydraulic turbines, either Francis or axial turbines, a high swirling flow is generated at PL
conditions at the inlet of the draft tube resulting in the formation of a rotating vortex rope …

Computational fluid dynamics (CFD) analyses were made to study the unsteady three‐
dimensional turbulence in the ERCOFTAC centrifugal pump test case. The simulations were …

ABSTRACT A computational fluid dynamics (CFD) code, dubbed SNUFOAM, was
developed to predict the performance of ship resistance using a CFD tool kit with open …

When a hydro turbine deviates from the best efficiency conditions and carries the partial
load, the helical vortex rope appears in the center of the draft tube. It will cause the unstable …

In this paper, we introduce a novel passive control method to mitigate the unsteadiness
effects associated to the swirling flows with self-induced instabilities. The control method …

The swirling flow exiting the runner of a hydraulic turbine is further decelerated in the
discharge cone of the draft tube to convert the excess of dynamic pressure into static …

When reaction hydraulic turbines are operated far from the design operating regime,
particularly at partial discharge, swirling flow instability is developed downstream of the …

Vortex breakdown occurs in highly swirling flows in various engineering applications, such
as hydraulic turbines working in either high-load or part-load conditions, leading to pressure …