Cfd study of the transverse migration of bubbles in a narrow rectangular duct assessment of the neptune_cfd code and benchmark of various closure models

This paper presents a computational fluid dynamics study of two-phase bubbly flow, and aims ata proper description of the spatial distribution of bubbles observed in narrow rectangular ductsfor various non-uniform inlet conditions. As such the study relies on the air-water experimentsperformed by Liu et al. (2012), and a comparison to their results allows an assessment of theaccuracy of different closure models, such as lift force, wall force and turbulent dispersion.Different interfacial area concentration models are also compared and appraised. The numericalcomputations are performed with the NEPTUNE_CFD code, developed together by AREVA,CEA, EDF and IRSN, and dedicated to the simulation of multiphase flows by means of anEulerian multi-fluid approach.