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This numerical study focuses on verification and validation of turbulent multiphase flow simulations, particularly flows within the gas/liquid stratified flow regime. It has been identified that computational fluid dynamics (CFD) simulations of such flows available in the literature do not demonstrate sufficient criteria and techniques for examining grid convergence, nor do they offer a sufficient comparative study amongst existing Reynolds-Averaged Navier-Stokes (RANS) turbulence modelling approaches. The present numerical investigation demonstrates the possibility of utilizing the Richardson extrapolation and the calculation of the Grid Convergence Index (GCI) to confidently select an appropriate grid size. The method of selecting an appropriate computational mesh is feasible, and the motivation for conducting such research is necessary before performing simulations for turbulent multiphase flows. Additionally, the different capabilities and limitations of RANS turbulence models available for multiphase flows have been assessed in the present study.

Numerical Investigation of a Stratified Turbulent Two-Phase Flow in a Horizontal Pipe in Conjunction with the Generalized Richardson Extrapolation