Description

This project models the siphon phenomenon in ANSYS Fluent. Fluid moves from higher to lower pressure; in a siphon, water rises to the pipe’s crest due to pressure difference and then descends under gravity. The case is 2D (built in SpaceClaim), meshed in ANSYS Meshing with 95,451 elements, and solved as a transient problem.

Siphon Methodology

A VOF multiphase model resolves the two-phase (air–water) field driving the flash-tank discharge and subsequent siphoning. Turbulence is handled with the realizable k–ε model and scalable wall functions. Pressure–velocity coupling uses SIMPLE; spatial discretization is second-order upwind for momentum and first-order upwind for k and ε. The domain is initialized by patching the water phase.

Conclusion

Post-processing provides contours of velocity, pressure, water volume fraction, and streamlines. The flash tank empties as the siphon establishes: water ascends to the pipe’s high point, then, driven by gravity, continues downward. Once initiated, the siphon maintains flow and drains the ponded region.