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Ogee Spillway CFD Simulation, ANSYS Fluent Training

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The present problem is an ogee spillway CFD simulation.

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

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Description

Spillway

The main task of this type of structure (spillway) is to remove excess water in situations such as flood that water flow damages the dam body. The structure of these spillways consists of a vertical plate in the flow direction of the fluid whose upper edge can be both sharp, curve, and wide. Spillways have several types, including open channel, chute, stepped, bell-mouth, siphon, ogee (ogee crest), side channel, labyrinth, and so on.

Problem Description

The present problem is an ogee spillway CFD simulation by ANSYS Fluent software. Since the channel uses two different flows, the two-phase flow model is used. The two-phase VOF (volume of fluid) model is used in this simulation so that the water is defined as the primary phase, and the air is defined as the secondary phase. The purpose of the present study is to investigate the behavior of water flow after passing through an ogee spillway in the presence of airflow.

The Assumption for Ogee Spillway CFD Simulation

The simulation is Steady-State, the solver is Pressure-Based, and the gravity effect is considered equal to -9.81 m.s-1 on Y-axis.

Geometry & Mesh

The 2-D geometry of the present model is designed by Design Modeler software. The present model involves a wide-angle overflow that comprises a vertical wall in the flow path. The unstructured mesh of the present model is carried out by ANSYS Meshing software. The element number is equal to 10959.

Ogee Spillway CFD Simulation Steps

Here are some summaries of the problem definition and problem-solving steps in the table:

Models
k-epsilon Viscous model
Standard k-epsilon model
Standard wall function Near wall treatment
Volume of fluid Multiphase model
air – water phases
Implicit formulation
Sharp interface modeling
On implicit body force
Boundary conditions (ogee spillway)
Mass flow inlet – Pressure inlet Inlet type
0 Pa Supersonic gauge pressure mixture air-inlet
0 volume fraction air
1 volume fraction water
0 Pa Supersonic gauge pressure mixture water-inlet
0 kg.s-1 mass flow rate air
376 kg.s-1 mass flow rate water
Pressure outlet Outlet type
1 backflow volume fraction air
0 backflow volume fraction water
Wall Walls type
stationary wall ogee wall
Solution Methods (ogee spillway)
Simple   Pressure-velocity coupling
PRESTO pressure Spatial discretization
second-order upwind momentum
Compressive volume fraction
first-order upwind turbulent kinetic energy
first-order upwind turbulent dissipation rate
Initialization (ogee spillway)
standard Initialization method
0.4626283 m.s-1 x-velocity
0 water volume fraction

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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