مشخصات پژوهش

In many industries, especially the oil and gas one, multiphase systems are very common and numerically simulating them is vital to both study them without the need to go to the lab and be able to even modify their phenomena. Due to the complexity of multiphase flow, development of reliable analysis tool is difficult. Computational fluid dynamics (CFD) has been an established tool for flow analysis in the field of single phase flow for more than 20 years but has only started to become established in the multiphase field as well. Computational fluid dynamics (CFD) is a relatively new technique, established in the second half of the 20th century and that can be used to simulate any fluid flow. However, since the numerical simulation of multiphase flow systems is particularly challenging due to their complexity, CFD has only started a few years ago to study these complex systems. Therefore, many areas related to the modelling of multiphase flow systems in CFD are still vague and need investigation. Phase interaction force is one of these vague areas as there are many forces of interaction between different phases (Drag, Lift, Wall lubrication, and etc.) in which each one has multiple models to be used. The purpose of this thesis is to study all these forces and their available models to find which forces and what models should be considered to better simulate a multiphase flow system. To be able to use CFD in a meaningful way it is important to investigate, understand and validate the many models offered in commercial codes. When a gas-liquid mixture flows into a branching pipe junction phase redistribution will occur and a higher proportion of gas will enter the side branch. The aim of the simulations was to find models/settings that accurately predict the phase redistribution phenomenon and investigate the effect of changing simulation parameters. This was done by systematically changing parameters and validating the results against the experimental data.