Recently published: Three‐phase Bi‐layer Model for Simulating Mixed Flows

Three‐phase Bi‐layer Model for Simulating Mixed Flows

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

Journal of Hydraulic Research (2012)

Keywords: Air entrainment ; Air entrapment ; Multiphase flow ; Air–water flow ; Drift-flux model.


Mixed flows characterized by a simultaneous occurrence of free surface and pressurized flows are often encountered in hydraulic engineering. Numerous researches have been dedicated to unify the mathematical description of both flows. Herein, shock-capturing models succeed in giving a unique set of equations. However, no method accounts for both air-entrapment and air-entrainment. This study proposes an original model to simulate air–water interactions in mixed flows. The new approach relies on the area-integration of a three-phase model over two layers. The applicability of this free surface model is extended to pressurized flows by a modified pressure term accounting for the dispersed air. The derived modelling system WOLF IMPack is then validated. The code successfully simulates open channel flows, mixed flows and water hammer in a unified framework, including air–water interactions, in structures like the drainage network.