Aponte Cruz, Edwin Rafael

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Numerical simulations of scalar transport across the sediment-water interface using a two-phase model
(2024-05-10) Aponte Cruz, Edwin Rafael; Rodríguez Abudo, Sylvia B.; College of Engineering; Torres Nieves, Sheilla; Ciri, Umberto; Department of Mechanical Engineering; Huérfano Moreno, Víctor
This study provides insights into the instantaneous and time-averaged behavior of scalar plumes under oscillatory flows, an understudied aspect in coastal processes. A comprehensive analysis is conducted on the complex interactions among oscillating flows, sediment transport, and passive scalar transport over bedforms using an advection-diffusion model integrated with two Reynolds-Averaged Navier-Stokes models. Simulations on fixed non-permeable beds with scalar sources at crest and trough, validated with experiments, show favorable comparisons in scalar field magnitudes, albeit with some dye dispersion overestimation. Incorporating sediment mobility through the two-phase model SedFOAM reveals significant alterations in flow dynamics and scalar transport. Large spatial and temporal variations in scalar concentration and fluxes, along with doubled dye spread at the crest, are observed, underscoring the importance of sediment transport and permeability. However, for scalar processes originating at lower advection regions, such as troughs and flanks, approximating scalar transport with a fixed non-permeable bed yields acceptable results.