The Discussers appreciate the novelty of the Author’s approach to turbulent unsteady friction modelling based on the similitude between transient energy dissipation and steady-state minor losses due to the vena contracta. However, its larger number of parameters to be calibrated with respect to standard unsteady friction models as well as the restriction to turbulent flow are to be considered. This discussion is divided into two parts: (1)Valuable laboratory results, yet known only to a few, relating to fully turbulent flow expansion downstream of an orifice are presented; and (2) Comments are offered about laboratory tests carried out at the Water Engineering Laboratory (WEL), University of Perugia, Italy, used by the Author to validate his model along with other experimental data from the University of Adelaide andWL|Delft Hydraulics, respectively.
Discussion of "A turbolent approach to unsteady friction, by I. Pothof"
BRUNONE, Bruno;MENICONI, SILVIA;FERRANTE, Marco
2009
Abstract
The Discussers appreciate the novelty of the Author’s approach to turbulent unsteady friction modelling based on the similitude between transient energy dissipation and steady-state minor losses due to the vena contracta. However, its larger number of parameters to be calibrated with respect to standard unsteady friction models as well as the restriction to turbulent flow are to be considered. This discussion is divided into two parts: (1)Valuable laboratory results, yet known only to a few, relating to fully turbulent flow expansion downstream of an orifice are presented; and (2) Comments are offered about laboratory tests carried out at the Water Engineering Laboratory (WEL), University of Perugia, Italy, used by the Author to validate his model along with other experimental data from the University of Adelaide andWL|Delft Hydraulics, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
