The domain which is divided between water and air has been uploaded as a STEP file to the SimScale platform. The mesh was generated using the hex-dominant mesh operation including a local mesh refinement of the region where the actual waterfall will appear to resolve the fine granular flow structures in that part of the flow domain. The resulting mesh consist of close to 2.8 million cells.
The simulation was set up using the analysis type for multiphase flow using a VoF method to capture the free surface. A fixed inlet flow velocity was assigned as a boundary condition and a specific water reservoir on the bottom was initialized. The simulation was carried out on a 16 core machine and took several hours.
The results provide a detailed insight into the resulting free surface and spilling behavior as well as local velocities.