WIT Press


Numerical Simulation Of One-dimensional Mixed Flow With Air/water Interaction

Price

Free (open access)

Paper DOI

10.2495/MPF090311

Volume

63

Pages

12

Page Range

367 - 378

Published

2009

Size

953 kb

Author(s)

F. Kerger, S. Erpicum, P. Archambeau, B. J. Dewals & M. Pirotton

Abstract

An original one-dimensional unified numerical model dealing with aerated mixed flow, characterized by a simultaneous occurrence of free-surface and pressurized flow, is derived and applied to the case of a gallery. The mathematical model is based on a new integration of the Homogeneous Equilibrium Model (HEM) over the cross section of a free-surface flow and consists of a simple set of equations analogous to the Saint-Venant equations. In addition, both free-surface and pressurized flows are mathematically modeled by means of the free-surface set of equations (Preissmann slot model). The original concept of the negative Preissmann slot is proposed to simulate sub-atmospheric pressure. This model is shown to be particularly well suited for the simulation of bubbly and intermittent flows. Keywords: hydraulics, Preissmann slot, homogeneous equilibrium model.

Keywords

hydraulics, Preissmann slot, homogeneous equilibrium model