Agricultural & Food: Water Spraying from the Roof of the Greenhouse

This project simulates a greenhouse roof watering system — water sprayed from roof-mounted nozzles falling through air and accumulating on the surface below. It's a clean introduction to two-phase flow under gravity, where the goal is to track where the water goes and how it distributes once it leaves the nozzle.

The case is built as a 2-D transient model in Design Modeler, with the domain split into two sections: a resident pool of water at the bottom and an upper region carrying a velocity inlet and an outlet. The tank sides are treated as walls. Meshing is done in ANSYS Meshing (~208,921 elements).

Physics is handled with the Eulerian multiphase model, using air as the primary phase and water as the secondary phase. Water enters at 0.3 m/s with gravity acting at −9.81 m/s² on the y-axis, and turbulence is closed with the SST k-ω model. Because the spray develops over time — water pumping out, falling, and pooling — the solver is run transient.

What the results show: velocity fields and air/water volume-fraction contours capture the full sequence — water pumping through the roof nozzles, dropping under gravity, and spreading across the bottom surface. The volume-fraction field is the key output: it shows coverage and where water collects, which is exactly what you'd tune in a real irrigation layout.

You'll learn to: set up a 2-D transient Eulerian two-phase case, define primary/secondary phases, apply gravity correctly, and read phase distribution from volume-fraction contours.