Author(s): Theodora P. Kalaryti; Nikolaos Th. Fourniotis; Efstratios E. Tzirtzilakis
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Keywords: Numerical model; Open-channel flow; Subcritical flow; Vegetated flow
Abstract: In the present study, a three-dimensional turbulent, sub-critical, open-channel flow (Fr = 0.2) with submerged rigid vegetation is numerically studied using the ANSYS FLUENT code. The VOF method for free-surface treatment and the standard k-ε turbulence model are employed for the numerical simulation of the flow. The vegetation is modeled as vertical, rigid cylinders fixed at the bottom of the channel. The results show that the vertical velocity profile in the submerged vegetation layer differs significantly from the upper non-vegetation layer, which reasonably follows the log law. Moreover, the structure of turbulence is notably affected in the neighborhood of the stems, leading to higher eddy viscosity values at the near-crest area of each stem.
Year: 2024