Combustion Inside the Boiler, Ansys Fluent CFD Simulation Training


In this project, a combustion inside the boiler has been simulated and the results of this simulation have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Combustion Inside the Boiler Project Description

The present simulation is about the combustion inside a boiler via ANSYS Fluent. Boilers are pressurized tanks that carry out the boiling or heating fluid. Boiling is a process that brings the temperature of a fluid to the boiling point. Therefore, the combustion reaction must occur inside these boilers. The combustion reaction occurs in the computational zone of the boiler, and the desired species are defined using the species transport model. Nine different species are defined to define the combustion reaction, and five combustion reactions between these species are defined as volumetric. The current boiler consists of two different inputs, airflow inlet, and fuel flow inlet. Airflow with the temperature of 303.15 K and mass flow rate of 3.375 kg.s-1 enters from the side of the boiler, and a combination of several different fuels with the temperature of 300 K and mass flow rate of 0.6135 kg.s-1 enters from the narrow pipes of the lower part of the boiler.

Geometry & Mesh

The present model is designed in 3D via SpaceClaim. The boiler is designed so that airflow enters from the side panel of the boiler, and a combination of fuel flows enter through the narrow pipes of the lower part of the boiler, and the boiler outlet is related to the upper pipe of the boiler.


The mesh of the present model has been done via ANSYS Meshing. Mesh is done unstructured, and the number of cells equals 4694637. Figure 2 shows the mesh of the model.


Set-Up & Solution

Assumptions used in this simulation  :

  • Pressure-based solver is used.
  • The present simulation is steady.
  • The effect of gravity is ignored.


Viscous k-epsilon
k-epsilon model realizable
near-wall treatment standard wall function
Species Model Species Transport
number of volumetric species 9 (C4H10, iC4H10, C3H4, C2H4 , Ch4, O2, CO2, H2O, N2)
reactions volumetric
Energy On
Boundary conditions
Inlet – Air Mass Flow Inlet
mass flow rate 3.375 kg.s-1
temperature 303.15 K
O2 mass fraction 0.21
N2 mass fraction 0.79
other species mass fraction 0
Inlet – Pipe Mass Flow Inlet
mass flow rate 0.6135 kg.s-1
temperature 300 K
CH4 mass fraction 0.704
C3H4 mass fraction 0.074
C2H4 mass fraction 0.035
iC4H10 mass fraction 0.063
C4H10 mass fraction 0.025
other species mass fraction 0
Outlet Pressure Outlet
gauge pressure 0 pascal
Outer Walls Wall
wall motion wall motion
heat flux 0 W.m-2
Inner Walls Wall
wall motion stationary wall
thermal conditions coupled
Pressure-Velocity Coupling Coupled
pressure second-order
momentum second-order upwind
turbulent kinetic energy second-order upwind
turbulent dissipation rate second-order upwind
energy second-order upwind
species mass fraction second-order upwind
Initialization methods Standard
gauge pressure 0 pascal
x-velocity 1.573 m.s-1
y-velocity & z-velocity 0 m.s-1
temperature 303.15 K
O2 mass fraction 0.21
other species mass fraction 0

Combustion Inside the Boiler Results

After solution, 2D and 3D contours related to each defined species’ temperature, velocity, and mass fraction, including oxygen, carbon dioxide, water vapor, CH4, C2H4, C3H4, and C4H10, are obtained. The contours show that after combining carbohydrates with oxygen, a combustion reaction occurs, and, as a result, the boiler interior temperature rises. Also, as the combustion reaction begins, carbohydrates and oxidants decrease at the boiler inlet, and in turn, carbon dioxide and vapor are produced as reaction products, and their amount increases. The results are shown in Figures.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.


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