NUMERICAL MODELLING OF AIR-WATER FLOW IN A VERTICAL DROP MANHOLE. Vitor Sousa IST, UTL Inês Meireles UA Jorge Matos IST, UTL Maria do Céu Almeida LNEC. OUTLINE. Introduction Experimental study Numerical code Numerical model implementation Conclusions. 1. INTRODUCTION.
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Maria do Céu Almeida
Numerical model implementation
The commercial code FLOW-3D®, developed by Flow-Science, Inc, was selected for this research due to its particularly efficient, robust and accurate method to simulate free-surface flows.
The Reynolds-Averaged Navier-Stokes (RANS) mixture equations are used in the theoretical model:
The simulations performed in this study show that the use of a RNG model combined with the TruVOF method allows for an adequate overall representation of the flow features in terms of water depth and pressure head
The activation of the model of air-entrainment was found crucial for the accuracy of the simulation of the pressure head of the air-water flow along the invert of the outlet channel.
The model chosen for this stage of the research is a simplified representation of many drainage systems where free drops exist at the manholes, particularly in older systems.
The results show that the code seems to simulate air-water flows down vertical drops correctly, particularly its effect in terms of pressure head.
José Pedro Matos
Nuno Marques Almeida
José Saldanha Matos