Ejector CFD Simulation, Two-Phase Flow, ANSYS Fluent Training

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In this project, two-phase flow of vapor and liquid ammonia in a two-phase ejector has been simulated by ANSYS Fluent software.

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

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Ejector Introduction

In general, an ejector 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 ejector 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.

Project Description

In this project, two-phase flow of vapor and liquid ammonia in a two-phase ejector has been simulated by ANSYS Fluent software. The realizable k-epsilon model is used for flow analysis. The VOF multi phase model for two phases of liquid ammonia and vapor ammonia has been used to investigate the phase interactions. The energy equation is also activated in this analysis. The liquid ammonia will enter the computational domain through the primary inlet with the pressure of 9MPa and temperature of 393K. This flow will induce the vapor ammonia to exit the ejector along with liquid ammonia.

Ejector Geometry & Mesh

The geometry of this model is designed and meshed in Gamit®. The mesh type used for this geometry is structured and the element number is 11808.

ejector ejector

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.

(ejector) Models
Viscous model k-epsilon
Model realizable
Near wall treatment Standard wall function
Energy model On
Multi phase VOF
Phase 1 Ammonia vapor
Phase 2 Ammonia liquid
(ejector) Boundary conditions
Outlets Pressure outlet
Gauge pressure 0 Pa
Temperature 312 K
Walls wall motion stationary wall
New wall Heat flux 0 W/m2
wall Coupled
(ejector) Solution Methods
Pressure-velocity coupling Simple
Spatial discretization pressure PRESTO!
Volume fraction compressive
momentum second order upwind
energy second order upwind
Turbulent kinetic energy First order upwind
Turbulent Dissipation rate First order upwind
(ejector) Initialization
Initialization method   Hybrid


We present the contours of, pressure, temperature, velocity, etc.

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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