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Dhondopant apte predictions9/17/2023 ![]() ![]() ![]() This first order model produces an exponential decay of scalar in the dead zone. Scalar transport in dead zones is typically modeled as a continuously stirred tank with an exchange coefficient for the interface across the shear layer. These flow geometries are simulated using RANS turbulence model and the standard k–ω closure. Dead zone lengths and the main stream velocity were varied. For the base case simulation, the depth-based Reynolds number is 16,000 and the dead zone is 0.5 depths in the flow direction and 7.5 depths in the transverse direction. The stream geometry can be split into two main regions, the main stream flow and the dead zone. This work studies the capabilities of computational fluid dynamics (CFD) to investigate the scaling relationships between flow parameters of an idealized geometry and the passive scalar exchange rate. Previous experimental work has focused on idealized dead zone geometries studied in laboratory flumes. ![]() These dead zones play an important role in stream nutrient retention and solute transport studies. Characterized by slower flow and recirculation, dead zones are naturally occurring cutouts in stream banks. Natural stream systems contain a variety of flow geometries which contain flow separation, turbulent shear layers, and recirculation zones. ![]()
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