The Investigation of a Two-Dimensional Numerical Model for Characterizing Energy Dissipation Efficiency in Stilling Basins

Hydraulic jumps play a critical role in the design of energy dissipation stilling basins. Although hydraulic jumps are inherently three-dimensional (3D) phenomena, they have traditionally been studied using one-dimensional (1D) approaches. In previous, enginners and researchers have relied primarily on 1D and 3D models to analyze hydraulic jumps. While 3D models provide high accuracy, they are also computationally expensive, and 1D models some how fail to capture the vortices and lateral flow effects inherent in hydraulic jumps. Two-dimensional (2D) models offer a balance between computational efficiency and accuracy, making them a promising alternative. This study seeks to evaluate the capability of a 2D hydraulic model to simulate experiments on abrupt expansion stilling basins, as well as to assess its applications and limitations. By focusing on critical design parameters, such as the expansion width ratio, inlet eccentricity, and inlet angle, the research aims to identify optimal designs that maximize energy dissipation through simulations of various parameter combinations. Preliminary findings reveal that energy dissipation efficiency stabilizes once the expansion width ratio surpasses a certain threshold, showing no significant further improvement. In the case of inlet eccentricity, adjustments are evaluated individually to ensure that the inlet is not centered and that the inlet wall does not overlap with the outlet wall. For the inlet angle, an optimal configuration is observed to vary based on the tailwater conditions. Ongoing work aims to validate the relationships between energy dissipation efficiency and the interplay of these parameters.