Fuel Injector CFD Simulation, Three-Phase Flow, ANSYS Fluent Training

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In this project, a three-phase flow fuel injector has been simulated by ANSYS Fluent software.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Fuel Injector Introduction

In general, a fuel injector is a system of ducting and nozzles used to direct the flow of a high-pressure fluid in such a way that a lower pressure fluid is entrained in the jet and carried through a duct to a region of higher pressure. It is a fluid-dynamic pump with no moving parts, excepting a valve to control inlet flow. A steam injector is a typical application of the principle used to deliver cold water to a boiler against its pressure, using its own live or exhaust steam, replacing any mechanical pump.

Fuel Project Description

In this project, a three-phase flow fuel injector has been simulated by ANSYS Fluent software. The standard k-epsilon model is used for flow analysis. The Mixture multi phase model for three phases of air, liquid and vapor has been used to investigate the phase interactions. The liquid will enter the computational domain through the injector with the velocity of 20m/s and a jet flow is formed inside.

Geometry & Mesh

The geometry of this model consists of a combustion chamber and a fuel injector and an air entrance. It is designed and meshed in Gambit®. The mesh type used for this geometry is unstructured and the element number is 932107.

fuel injector fuel injector fuel injector

Fuel Injector CFD Simulation Settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are steady.
  • The effect of gravity is ignored.

The applied settings are summarized in the following table.

Viscous model k-epsilon
Model standard
Near wall treatment Standard wall function
Multi phase mixture
Mixture parameters Slip velocity
Phase 1 air
Phase 2 liquid
Phase 3 vapor
Boundary conditions
Inlet Velocity inlet
Velocity 20m/s
liquid Volume fraction=1
Outlets Pressure outlet
Gauge pressure 0 Pa
Walls wall motion stationary wall
Solution Methods
Pressure-velocity coupling Simple
Spatial discretization pressure PRESTO!
Volume fraction First order upwind
momentum First order upwind
Turbulent kinetic energy First order upwind
Turbulent Dissipation rate First order upwind
Initialization method   standard
Gauge pressure 0 Pa
Velocity(x,y,z) 0 m/s
Turbulent kinetic energy 1.5 m2/s2
Turbulent Dissipation rate 1129627 m2/s3


The contours of, pressure, velocity, streamlines, liquid volume fraction and etc. are presented.

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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