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<p>Stilling basins are critical techniques in hydraulic engineering that are designed to dissipate the kinetic energy of water flowing from pipe outlets. This study aims to assess the performance of stilling basin using ANSYS Fluent focusing on the effects of varying the height and position of the impact wall from the pipe outlet on energy dissipation. A parametric study was conducted to investigate significant parameters including the relative energy dissipation, average longitudinal velocity, turbulent dissipation rate, and turbulent kinetic energy. The findings indicate that the in-practice basin exhibits a 0.37% higher relative energy dissipation compared to the United States Bureau of Reclamation basin. Reducing the impact wall distance from pipe outlet is accompanied by an increase in energy dissipation, with the highest dissipation observed at a wall of distance 3d (d is the pipe outlet diameter). At this distance, dissipation is 1.5% greater than that recorded at 2d. Energy dissipation is also influenced by the height of the impact wall. Higher walls (3.167d and 3.75d) achieve more energy dissipation. Also, the in-practice basin also showed a smoother velocity profile, with the velocity decreasing significantly after encountering the impact wall. The maximum values of turbulent dissipation rate and turbulent kinetic energy were located near the impact wall, especially with greater heights. These results offer valuable insights for designing the stilling basin to better control flow. The outcomes can improve the design of pump station outlets and are also globally applicable.</p>

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Numerical analysis of flow characteristics through stilling basin at pump stations outlets

  • 期刊论文

  • 发表日期：

    2025年12月22日

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  • E. M. Elshahat,
  • M. Elhousseiny,
  • M. R. Fahmy,
  • H. F. Abd-Elhamid,
  • M. Zeleňáková,
  • M. Awad

摘要

Stilling basins are critical techniques in hydraulic engineering that are designed to dissipate the kinetic energy of water flowing from pipe outlets. This study aims to assess the performance of stilling basin using ANSYS Fluent focusing on the effects of varying the height and position of the impact wall from the pipe outlet on energy dissipation. A parametric study was conducted to investigate significant parameters including the relative energy dissipation, average longitudinal velocity, turbulent dissipation rate, and turbulent kinetic energy. The findings indicate that the in-practice basin exhibits a 0.37% higher relative energy dissipation compared to the United States Bureau of Reclamation basin. Reducing the impact wall distance from pipe outlet is accompanied by an increase in energy dissipation, with the highest dissipation observed at a wall of distance 3d (d is the pipe outlet diameter). At this distance, dissipation is 1.5% greater than that recorded at 2d. Energy dissipation is also influenced by the height of the impact wall. Higher walls (3.167d and 3.75d) achieve more energy dissipation. Also, the in-practice basin also showed a smoother velocity profile, with the velocity decreasing significantly after encountering the impact wall. The maximum values of turbulent dissipation rate and turbulent kinetic energy were located near the impact wall, especially with greater heights. These results offer valuable insights for designing the stilling basin to better control flow. The outcomes can improve the design of pump station outlets and are also globally applicable.