Ogee Spillway CFD Simulation
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.
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:
|Standard wall function||Near wall treatment|
|Volume of fluid||Multiphase model|
|air – water||phases|
|On||implicit body force|
|Boundary conditions (ogee spillway)|
|Mass flow inlet – Pressure inlet||Inlet type|
|0 Pa||Supersonic gauge pressure||mixture||air-inlet|
|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|
|stationary wall||ogee wall|
|Solution Methods (ogee spillway)|
|first-order upwind||turbulent kinetic energy|
|first-order upwind||turbulent dissipation rate|
|Initialization (ogee spillway)|
|0||water 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.