Firehose Simulation, Ansys Fluent Training
In this project, a firehose has been simulated and the results have been investigated.
This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Firehose Project Description
The current project simulates the firehose by Ansys Fluent software. The system consists of two different fluids, including air as the primary fluid and one secondary fluid is water. The Eulerian VOF model has been used. The water is entering the domain with a speed of 9 m/s with gravity considered as -9.81 m/s-2 on the y-axis.
The 2-D geometry of the present model is carried out using Design Modeler software. The geometry has a one-cylinder shape object as imaginary on fire, and firehose as inlet, firehose geometry itself design by followed eruption firehose standard shape to simulate water flow directly and accurately. Ground and object considered as wall and also around sphere considered as an outlet.
The meshing of this present model has been generated by ANSYS Meshing software. The mesh grid is unstructured with no element quality lower than 0.61, and the total cell number is 147351. the figure below shows an overview of the performed mesh.
Firehose CFD Simulation
To simulate the present model, several assumptions are considered, which are:
- The solver is pressure-based.
- Simulation has only examined fluid behavior; in other words, heat transfer simulation has not been performed.
- The effect of gravity on the flow is considered to be 9.81 m.s-2 and along with the y-axis in the present model.
The following tables represent a summary of the defining steps of the problem in this project and its solution:
|shear flow corrections||k-epsilon options|
|0||initial gauge pressure||mixture|
|24 m/s||velocity magnitude||air|
|1||backflow volume fraction||air|
|0||backflow volume fraction||water|
|stationary wall||wall motion|
|Phase coupled||pressure-velocity coupling|
|first-order upwind||specific dissipation rate|
|first-order upwind||volume fraction|
|9 m/s||water velocity (0,y,0)|
|0 m/s||air velocity (x,y,z)|
|1||the secondary phase volume fraction|
Water starts to flow from the firehose nozzle toward a cylinder-shaped object. It finally hits it and covers it with water to burn the imaginary fire. The whole simulation takes action about 1.2 seconds long.
You can obtain Geometry & Mesh file and a comprehensive Training Movie which presents how to solve the problem and extract all desired results.