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Access type: UnknownAuthor: search.filters.author.Sergio Peralta

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    Parallel domain decomposition of a FEM-based tool for numerical modelling mineral slurry-like flows
    (Taylor and Francis Ltd., 2022-01-01)
    The main parallelisation related features of a computational tool based on the finite element method (FEM) for the numerical modelling of mineral-slurry like flows are described in this work. In particular, both the domain decomposition method (DDM) and the processes communication strategy employed are discussed in detail. The DD algorithm is based on the iterative update of the boundary conditions imposed on the interfaces between subdomains, the so-called transmission conditions. Due to its versatility in several parallel architectures, the message-passing standard used here is the message passing interface (MPI) one. Since mineral-slurries rheology may change according to the prevailing local flow conditions, Newtonian and non-Newtonian viscous fluids are considered in this work. Indeed, both Newtonian and non-Newtonian laminar flows are numerically studied in two well-known canonical configurations usually found in mineral-slurry transport. The main results show that the parallel FEM based tool is capable of carrying out high-fidelity numerical simulations of mineral-slurry like flows. Finally, in all numerical simulations performed, relatively good speedups were obtained.
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    Direct numerical simulations of two-phase fluids interface in 2D rotating drums using a coupled VOF–IBM numerical approach
    (Begell House Inc., 2024-01-01)
    Rotating drums play important roles in numerous industrial applications, such as mineral processing. This work is focused on the numerical study of the interface evolution in liquid–liquid and liquid–gas phase rotating drums. A new coupling strategy between volume of fluid (VOF) and immersed boundary method (IBM) approaches is developed. Relevant dimensionless numbers, including Reynolds, Froude, and Bond numbers, alongside viscosity and density ratios, are considered for the flow pattern characterization. Direct numerical simulations are performed in order to explore flow regimes within the rotating drum, addressing a gap in the literature concerning less-explored flow patterns, particularly in the rotating drum containing liquid–liquid phases. The flow pattern families characterizing rotating drums carrying liquid–liquid phases found in this study are (i) gravity stratified, (ii) mixing, (iii) annular, and (iv) rotation stratified flows. Additionally, the characteristic flow pattern families, gravity stratified, (ii) pool, (iii) annular with pool, and (iv) annular flows, are identified in rotating drums carrying liquid–gas phases. The difference in the transitory responses between the rotating drum featuring liquid–liquid and liquid–gas phases is also shown and discussed. The main results highlight significant contributions for understanding the dynamics of rotating drums, particularly concerning the transitional interface development. By identifying new flow patterns and exploring transitional phenomena, this study enriches the understanding of complex fluid behavior within rotating drum configurations.