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Ogee Spillway CFD Simulation

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In general, any obstacle that impedes the passage of water and causes the water level to rise up behind it is called a spillway.


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The main task of this type of structure (spillway) is to remove excess water in situations such as floods 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. 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:

k-epsilonViscous model
Standardk-epsilon model
Standard wall functionNear wall treatment
Volume of fluidMultiphase model
air – waterphases
Sharpinterface modeling
Onimplicit body force
Boundary conditions (ogee spillway)
Mass flow inlet – Pressure inletInlet type
0 PaSupersonic gauge pressuremixtureair-inlet
0volume fractionair
1volume fractionwater
0 PaSupersonic gauge pressuremixturewater-inlet
0 kg.s-1mass flow rateair
376 kg.s-1mass flow ratewater
Pressure outletOutlet type
1backflow volume fractionair
0backflow volume fractionwater
WallWalls type
stationary wallogee wall
Solution Methods (ogee spillway)
Simple Pressure-velocity coupling
PRESTOpressureSpatial discretization
second-order upwindmomentum
Compressivevolume fraction
first-order upwindturbulent kinetic energy
first-order upwindturbulent dissipation rate
Initialization (ogee spillway)
standardInitialization method
0.4626283 m.s-1x-velocity
0water volume fraction


All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.



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