Hydraulic Jump of Water Flow in a Rectangular Channel
In this project, hydraulic jump of water flow in a rectangular channel is analyzed.
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Hydraulic Jump Problem description
In this project, hydraulic jump of water flow is analyzed. 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 80 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 80 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 231646.
- 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.
|Near wall treatment||standard wall treatment|
|Multiphase (Volume of Fluid)||Volume fraction parameters||Implicit|
|Body force formulation||Implicit body force|
|Number of Eulerian phases||2|
|Fluid||Definition method||Fluent Database|
|Inlet_water||Type||Mass flow inlet|
|Mass flow||50 and 80 kg/s|
|Spatial discretization||Gradient||Least square cell-based|
|Momentum||Second order Upwind|
|Volume fraction||Modified HRIC|
|K||First order Upwind|
|Epsilon||First order Upwind|
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.
There are a Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.