A model for computing thermally-driven shallow flows

Echeverribar, I. ; Martínez-Aranda, S. (Universidad de Zaragoza) ; Fernández-Pato, J. (Universidad de Zaragoza) ; García, R. ; Brufau, P. (Universidad de Zaragoza) ; García-Navarro, P. (Universidad de Zaragoza)

Resumen: In many natural disasters such as overland oil spills or lava flows, physical fluid properties as density change when considering non-homogeneous spatial and time variable distributions of the temperature. This effect is even more remarkable when these flows show a non-Newtonian behaviour due to the sensitivity of their rheological properties as viscosity or yield stress to temperature. In these cases, temperature becomes a significant variable that drives the fluid behaviour, which must be solved using an energy equation coupled with the free surface flow system. Special attention is devoted to thermal source terms which must include all the heat fluid exchanges, and their modelling sometimes can govern the complete flow behaviour. Fluid density, viscosity and yield stress, also affected by temperature, must be recomputed every time step. Summarizing, this work presents a 2D free surface flow model considering density and temperature variations, which could even modify viscosity and yield stress, with heat transfer mechanisms. The model is applied to oil spill overland simulations and heating/cooling test cases are carried out to ensure the system energy balance. As conclusions, it can be said that the numerical results demonstrate the importance of the heat exchange effects and those of the density, viscosity and yield stress variations.

Idioma: Inglés

DOI: 10.1088/1755-1315/1136/1/012037

Año: 2023

Publicado en: IOP Conference Series: Earth and Environmental Science 1136 (2023), 012037[8 pp.]
ISSN: 1755-1307

Factor impacto CITESCORE: 1.0 - Earth and Planetary Sciences (all) (Q3) - Environmental Science (all) (Q4)

Factor impacto SCIMAGO: 0.199 - Earth and Planetary Sciences (miscellaneous) - Physics and Astronomy (miscellaneous) - Environmental Science (miscellaneous)

Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER/T32-20R
Financiación: info:eu-repo/grantAgreement/ES/MICINN-FEDER/PGC2018-094341-B-I00

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Mecánica de Fluidos (Dpto. Ciencia Tecnol.Mater.Fl.)