On the Robustness of Two-Phase Flow Models for Bubbly Flows

Paper in proceeding, 2017

Lack of robustness, manifesting as an inability to suppress the growth of numerical round-off errors, is a well-known challenge with many conventional two-fluid models. In the current work, a hyperbolic two-phase mixture model in conservative form is analysed and assessed in relation to a single-pressure two-fluid model. The robustness of the simulation results indicates that the mixture model and the associated numerical methods may be well suited to enable high-resolution simulations of more complex two-phase phenomena. In particular, significant advantages in terms of stability and robustness of the mixture model formulation are found in comparison to the non-hyperbolic and non-conservative single-pressure two-fluid model.