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Hydraulic Jump of Water Flow in a Rectangular Channel

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In this project, hydraulic jump of water flow in a rectangular channel is analyzed.

This product includes a Mesh file and a comprehensive Training Movie.

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Description

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.

hydraulic jumphydraulic jump

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.

Models
Viscous K-epsilon model Standard
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
Materials
Fluid Definition method Fluent Database
Material name Air
Material name Water
Boundary conditions
Inlet_air Type Pressure inlet
Gauge pressure zero
Inlet_water Type Mass flow inlet
Mass flow 50 and 80 kg/s
Solver configurations
Pressure-velocity coupling Scheme SIMPLE
Spatial discretization Gradient Least square cell-based
Pressure PRESTO!
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.

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