Hydraulic Jump Problem description

In this project, hydraulic jump of water flow is analyzed by ANSYS Fluent software. The VOF approach is utilized in order to efficiently simulate the water flow inside ambient air. Hydraulic jump is of great importance in agricultural applications and open channel flows where water flow, after certain distance which can be solved for using analytical equation, undergoes significant decrease in velocity and increase in flow height. In the present work, water flow with two different mass flow inlets is analyzed, 50 and 65 kg/s. hydraulic jump occurs in 0.9 and 2.8 m downstream the flow for cases with water mass flow rate equal to 50 and 65 kg/s.

Geometry and mesh

Geometry of fluid domain is designed in Design Modeler and computational grid is generated using ANSYS Meshing. Mesh type is structured and element number is 231,646.

Solver configuration

Critical assumptions:

• Solver type is assumed Pressure Based.
• Time formulation is assumed Steady.
• Gravity effects are considered as -9.81 m/s2 in Y direction.

The following table a summary of the defining steps of the problem and its solution.

Hydraulic Jump Results and discussion

Distance downstream of water flow where hydraulic jump takes place is equal to 0.9 and 2.8 m for water flows equal to 50 and 80 kg/s.