Description

This project models water flowing over an ogee spillway into a pond using ANSYS Fluent. Two operating regimes are considered:

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  Free-surface flow: water reaches the crest at a set head with a flow rate of 140 kg/s.

  
  


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  Pressurized flow: water passes the crest under pressure with a flow rate of 420 kg/s.

  
  

The geometry is built in DesignModeler as a 2D domain: an ogee overflow discharging into a pond. Two layout variants are used—one with an upstream approach section before the overflow and one without. The inlet boundary is split into water and air inlets. Meshing is done in ANSYS Meshing with a semi-structured grid: 20,142 elements for the free-surface case and 16,409 for the pressurized case.

Pond Methodology

Both cases use a two-phase VOF model with air as the primary phase and water as the secondary phase to capture the free surface and pressurization behavior through the spillway and into the pond.

Conclusion

Post-processing yields 2D contours of pressure, velocity, and phase volume fraction for each case. Additionally, static pressure variation along the pond direction is plotted for both configurations to compare free-surface and pressurized flow behavior.