Multifield hybrid approach for two-phase flow modeling – Part 1: Adiabatic flows

• We implement a 3-field hybrid approach for complex two-phase flow simulations.
• The gas phase is split into two field.
• Each 2-field approach being already validated, we propose a set of coupling terms.
• The coupling is achieved through mass transfer terms.

As a step towards a hybrid approach for the simulation of two-phase flow transitions, the objective of the present work is to check out the capability of a numerically effective hybrid model. The multifield hybrid approach for two-phase flow modeling consists in dealing separately with the small and spherical bubbles, treated with a dispersed approach, and with the large and distorted ones, which interface is located. These two approaches are coupled through mass transfer terms. The overall method relies on two existing blocks, consisting in a set of averaged models dedicated to dispersed bubbles and another one dedicated to interface locating, which have already been validated and have given a reasonable agreement with experimental data.The main outcome is the simulation of a three field case with a complete set of coupling terms between the two gas fields. This approach is used to simulate the experiment of Castillejos, a bubble plume in a water tank presenting a wide range of bubble diameter.