Two-Phase Flow Modelling of Sediment Transport: Challenges and Potential Applications
(2014) CSME-14 / SARCLE-14: Adapting Sustainable Remediation and Management of Soil, Sediment and Water, — Location: Belgique (20.October.2014)
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- Sediment transport is induced by the interaction between turbulence and the solid particles that comprise the sediment. Due to the permeability of the sediment, water can penetrate it, thus forming a heterogeneous, immiscible mixture. As water flows through and over the sediment, it exerts both normal and shear stresses that engender its erosion. Traditional single-phase flow models, and their incarnations, cannot properly account for the complex interactions between the solid particles and water. The circumvention of this difficulty necessitates the employment of two-phase flow models. This type of models take into consideration the dynamics of both phases and, as such, are well adapted for the description of the problem at hand. However, two-phase flow models are characterized by both a large size and a high complexity which have, in turn, impeded the development of algorithms for their integration. Consequently, the predictive capacity of these models and their applicability remain unclear. In the first part of this talk, we present a two-phase flow model for sediment transport and we elaborate on the challenging issues that render the algorithm development for its integration an arduous task. Subsequently, we delineate a recently proposed algorithm for the model at hand and we demonstrate its efficiency and robustness via simulating numerically gravity-driven flows of subaqueous granular beds and granular columns. In the second part of this talk, the focus is shifted to the applicability of the presented simulation tool to realistic large-scale flows. For this, we clearly identify the strengths and limitations of our simulation tool; given the complexity of the phenomenon that is envisioned to be described, such a scrutiny is deemed vital. Finally, we expound the bottlenecks and critical points that have to be properly addressed before the present simulation tool can be employed in real-life applications.
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Varsakelis, C., Monsorno, D., & Papalexandris, M. (2014). Two-Phase Flow Modelling of Sediment Transport: Challenges and Potential Applications. CSME-14 / SARCLE-14: Adapting Sustainable Remediation and Management of Soil, Sediment and Water, Belgique. https://hdl.handle.net/2078.5/193931