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shafabakhsh--paiman
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Convective-Reactive Transport and Unstable Density-Driven Flow in Fractured Porous Media
, M.Sc. Thesis Sharif University of Technology ; Ataie-Ashtiani, Behzad (Supervisor)
Abstract
The goal of this study is to explore the density-driven flow and study the effect of fracture as well as chemical processes and reactions on convective transport. Convective flow is used in connection with the density-driven flow where the flow is driven by density differences in the fluid, which can be affected by the ambient rocks. Several studies of density-driven flow in porous media have focused on the effect of heterogeneity on the mixing convection; however, they neglect the key processes of geochemical reactions in fractured porous media. This study aims to address this gap by investigating the combined effect of heterogeneity (as fractures) and the existing geochemical reactions on...
Unstable density-driven flow in fractured porous media: The fractured elder problem
, Article Fluids ; Volume 4, Issue 3 , 2019 ; 23115521 (ISSN) ; Fahs, M ; Ataie Ashtiani, B ; Simmons, C. T ; Sharif University of Technology
MDPI AG
2019
Abstract
The Elder problem is one of the well-known examples of an unstable density-driven flow (DDF) and solute transport in porous media. The goal of this research is to investigate the influence of fracture networks on this benchmark problem due to the great importance of the fractured heterogeneity effect on unstable DDF. For this aim, the fractured Elder problem is solved using COMSOL Multiphysics, which is a finite element method simulator. Uniform and orthogonal fracture networks are embedded to analyze free convective flow and development of unstable salt plumes. The results indicate that the mesh sensitivity of the fractured Elder problem is greater than the homogeneous case. Furthermore, it...
Convective-reactive transport of dissolved CO2 in fractured-geological formations
, Article International Journal of Greenhouse Gas Control ; Volume 109 , 2021 ; 17505836 (ISSN) ; Ataie Ashtiani, B ; Simmons, C. T ; Younes, A ; Fahs, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
Carbon dioxide (CO2) storage in geologic formations is an attractive means of reducing greenhouse gas emissions. The main processes controlling the migration of CO2 in geological formations are related to convective mixing and geochemical reactions. The effects of heterogeneity on these coupled processes have been widely discussed in the literature. Recently, special attention has been devoted to fractured geological formations that can be found in several storage reservoirs. However, existing studies on the effect of fractures on the fate of CO2 neglect the key processes of geochemical reactions. This work aims at addressing this gap. Based on numerical simulations of a hypothetical...