Pond Overflow CFD Simulation by ANSYS Fluent Training

Description

Description

The present problem simulates the water flow on an overflow that enters a pond using ANSYS Fluent software.

In the current simulation, an ogee spillway leads to a pond. In this case, where the flow is a free surface, the water flow reaches the overflow at a certain height, with a flow rate of 140 kg/s. In the case of pressure, the water flows at a certain height with a flow rate of 420 kg/s.

The present model is designed in two dimensions using Design Modeler software. The model’s geometry consists of an ogee overflow leading to a pond. Of course, modeling is designed in two modes.

In one, there is an upstream area before the overflow, but in the other, this area does not exist. The inlet flow boundary consists of two parts: the water flow and the airflow inlet.

The meshing has been done using ANSYS Meshing software, and the mesh type is semi-structured. The element number of the free-flow case is 20142 and of the pressure-flow case is 16409.

Pond Methodology

In this simulation, two case studies are defined, in one, water flows as a free surface flow to the overflow and then flows into the pond, while in another, the water flows under pressure on the overflow and into the pond.

Therefore, for both cases, a two-phase VOF flow model is used; So that the primary phase (air) and the second phase (water) are defined.

Pond Conclusion

At the end of the solution process, two-dimensional contours related to pressure and velocity and the volume fraction of each of both phases are obtained.

Also, the results are obtained in both cases. The diagram of static pressure changes of water flow in terms of the direction of the pond in both models is obtained.