Description

The present problem simulates the siphon phenomenon using ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

Water always flows from an area under higher pressure to an area of lower pressure. The siphon effect occurs when the fluid flows to the highest portion of the bend pipe due to the pressure difference and then comes down from there due to gravity.

The present model is designed in two dimensions using the SpaceClaim software. The meshing of the model was done using ANSYS Meshing software. The element number is 95451.

Also, due to the nature of the problem, the transient solver is enabled.

Siphon Methodology

This project uses the VOF multiphase model to simulate and solve the two-phase flow field equations. The flash tank discharges and the siphoning effect causes the water to drain.

The K-epsilon Realizable viscous model with scalable wall function has been used to solve the turbulent flow equations. The pressure-velocity coupling scheme is SIMPLE.

The second-order upwind discretization method has been used for Momentum, and the first-order upwind discretization method has been used for Turbulent kinetic energy and Turbulent dissipation rate.

Initially, the patching option was used to add the water phase into the domain.

Siphon Conclusion

After the solution process is completed, contours of velocity, pressure, water volume fraction, and streamline are extracted and presented below. As observed, the water inside the flash tank discharges and causes the siphoning effect.

Due to the siphoning effect, water will pass through the pipe and go to the highest point, and then due to gravity, it will come downward. Once the water flow has begun, the water will continue to flow, draining the ponding area.