Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
A Numerical Method for High Resolution Simulations of Solid-liquid Flows Using DEM
Submission Author:
Roderick Gustavo Pivovarski , PR
Co-Authors:
Roderick Gustavo Pivovarski, Admilson Franco
Presenter: Roderick Gustavo Pivovarski
doi://10.26678/ABCM.ENCIT2018.CIT18-0669
Abstract
The motion of solid particles dispersed in viscous fluids is of great interest in several industries. In the particular case of oil industry, cuttings from oil wells are carried away by drilling fluids, and the acting forces between solid and liquid phases dictate the two-phase flow regime. This paper focuses on the numerical calculation of the forces acting on a single spherical particle immersed in different fluids, such as air, water and silicone oil, using both one and two-way coupling between the particle and the continuous phase, in a Eulerian-Lagrangian framework. Firstly, using one-way coupling between fluid and particle, numerical methods are compared in order to properly model the forces acting on the particle: drag, Magnus lift, Saffman’s lift, Basset’s (history), pressure gradient, drag torque and virtual mass. Forces originated from collisions between the particle and a surrounding wall are accounted for by the Discrete Element Method (DEM) with a simple linear-spring model. Results show that the history term is indispensable when it comes to calculating the motion of a bouncing particle immersed in a viscous liquid, and DEM correctly models the impact of the bead. When two-way coupling is used to account for the influence of the solid phase on the surrounding fluid, other factors become important and the grid size may be constrained by traditional numerical methods. A promising alternative approach that re-distributes the momentum source term in the neighboring cells is implemented and analyzed. Validation tests show that this alternative manages to better represent real physical phenomena.
Keywords
Oil well, Discrete element method, Two-way Coupling, Momentum distribution
