Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Turbulent Viscosity Model Assessment for the 1D Numerical Simulations of Vertical Annular Flows
Submission Author:
Rodrigo Luís Formosinho Castello Branco , RJ , Brazil
Co-Authors:
Markus Ballhausen, Rodrigo Luís Formosinho Castello Branco, Joao Carneiro, Angela Nieckele
Presenter: Angela Nieckele
doi://10.26678/ABCM.COBEM2023.COB2023-1589
Abstract
In industrial applications of two-phase flows through pipes, one-dimensional models are commonly used. Among those, the "Slug Capturing" 1D Two-Fluid Model is particularly attractive due to its ability to capture the transition between different regimes (such as from stratified to slug flow). However, in vertical pipes, the standard Two-Fluid Model becomes unconditionally ill-posed, which will lead to the inability to obtain a grid independent solution. Therefore, simulations with capturing schemes are potentially problematic in such situations depending on mesh resolution requirements. To address this issue, several authors have proposed different physical closure relations to render the Two-Fluid Model well posed. In the present work, we investigate the impact of introducing axial diffusion coupled with different proposition of turbulent viscosity models, as well as its combined effect with the momentum flux parameter. To evaluate the effectiveness of the models, comparisons with experimental data of different data sets are carried out.
Keywords
Two Fluid Model, turbulence modeling, Vertical Annular Flows, Closure Models
