Methane Combustion in a Gas Stove — ANSYS Fluent CFD SimulationDescriptionThis project presents a CFD simulation of methane combustion in a gas stove — a familiar everyday device that's surprisingly rich in physics. Modeling stove combustion matters for design, optimization, safety, and efficiency. As methane burns, it raises the local temperature, which lowers the air density; the hot exhaust then rises by buoyancy, drawing fresh, denser air in to sustain the flame. In this project, you'll capture that complete cycle — combustion, heat release, and natural-draft airflow — in a full 3D model. As the opening project of the Combustion: Beginner CFD Training Package, it introduces the foundational combustion workflow through the most familiar everyday burning device.MethodologyThe 3D gas stove geometry is designed in Design Modeler and meshed with a large unstructured grid of roughly 5.53 million elements using Fluent Meshing. The energy equation is activated for the reacting, heat-releasing flow, and the Species Transport model is set up with a methane combustion mechanism. The turbulence–chemistry interaction is handled with the eddy-dissipation model — a robust, efficient choice for combustion — and turbulence is modeled with the Realizable k-ε model, which offers good accuracy at low computational cost for this kind of problem. A Pressure Inlet boundary condition is applied so that the combustion air is drawn in naturally by the pressure difference rather than forced, capturing the coupled physics of combustion and buoyancy-driven natural convection.AnalysisPost-processing produces temperature, CO₂ mass fraction, and velocity contours in both 2D axial planes and 3D, revealing the flame structure, the products of combustion, and the natural-draft airflow. The results identify a peak flame temperature of about 1709 K and a buoyancy-driven velocity of about 1.33 m/s, confirming how the heat release sets up the rising exhaust and the fresh-air intake that sustains the flame. Combustion plus natural draft appears in stoves, furnaces, water heaters, flares, and fired heaters, and the Species Transport + eddy-dissipation + buoyancy workflow built here is a foundational, widely transferable combustion-modeling skill. By the end of this project, you'll be able to set up a reacting-flow simulation with the Species Transport model and a methane combustion mechanism, configure the eddy-dissipation turbulence–chemistry interaction, apply a pressure-inlet natural-draft boundary condition, and interpret the temperature, species, and velocity fields of a buoyancy-driven combustion problem.

Non-Premixed Combustion — ANSYS Fluent CFD SimulationDescriptionThis project simulates non-premixed combustion in a 2D combustion chamber, where air and hydrocarbon fuel enter through two separate inlets and react to release the fuel's chemical energy as heat. It's a foundational study in reacting-flow CFD — the configuration that describes most real burners, furnaces, and gas-turbine combustors, where fuel and oxidizer are deliberately kept apart until they meet in the reaction zone. Within the Combustion: Beginner CFD Training Package, this project introduces the foundational combustion model — the mixture-fraction approach — establishing the core reacting-flow method the later chamber, swirl, and flare cases build on.MethodologyThe key modeling choice is the non-premixed (mixture-fraction) approach within Fluent's Species Transport framework. Instead of tracking every reaction rate directly, the model solves transport equations for the mixture fraction — the local mass fraction originating from the fuel stream — and reads the resulting species and temperatures from pre-computed chemistry. This is what makes non-premixed combustion both efficient and stable: the chemistry is folded into the mixture fraction, so you model the mixing and let the thermochemistry follow. By definition, the fuel and oxidizer enter through independent paths and do not premix before reaching the chamber. An air stream (N₂ at mass fraction 0.767, O₂ at 0.233) enters at 300 K and 1.19 kg/s, while a pure CH₄ (methane) stream enters at 300 K and 0.019 kg/s through a separate inlet. The geometry is built in Design Modeler and meshed in ANSYS Meshing as an unstructured mesh of 11,202 cells.AnalysisThe results provide contours of pressure, temperature, velocity, and density, plus mass-fraction fields for O₂, CH₄, H₂O, CO₂, N₂, CO, and C₂H₆, along with in-chamber pathlines. The fields confirm a properly anchored combustion reaction: methane and air react where the streams meet, consuming reactants and producing CO₂, H₂O, and intermediates like CO — and the temperature field maps the flame and hot-product zone exactly where the mixture fraction is near stoichiometric. By the end of this project, you'll be able to set up Species Transport with the non-premixed mixture-fraction model, define separate fuel and oxidizer inlets with realistic compositions and flow rates, and read flame structure and product formation from temperature and species contours.

DescriptionThis project simulates steady-state combustion inside a cylindrical combustion chamber using ANSYS Fluent, a device central to countless industrial applications where continued performance improvement remains an active engineering focus. The chamber has four radial air inlets around its circumference, four axial fuel inlets at the top, and a single outlet at the bottom for combustion products. Air enters through two distinct paths: the first air stream passes through swirl-inducing blades before entering the chamber to promote flow circulation, while the second stream bypasses direct entry and instead reaches the chamber through perforations, a staged air-admission strategy intended to produce a more stable flame. Methane serves as the fuel. The 3D geometry is built in SpaceClaim and meshed in ANSYS Meshing with 2,626,307 elements.MethodologyThe chemical reaction between air and methane is captured with the Species Transport model, tracking five species: O2, N2, CH4, CO2, and H2O. Air enters at 0.21 oxygen mole/mass fraction, a flow rate of 0.005 kg/s, and 430 K, while fuel enters simultaneously at 0.0001 kg/s and 300 K. The outer chamber wall is treated as adiabatic with zero heat flux. Turbulence and the resulting temperature distribution are resolved using the RNG k-epsilon model together with the energy equation.AnalysisThe solution yields 2D contours of temperature and velocity throughout the chamber. These results indicate the staged air admission and swirl-inducing blade arrangement are achieving effective combustion, with the chamber reaching an average temperature of 1006.5 K, consistent with a well-established, stable methane-air flame under the given flow and thermal boundary conditions.

Combustion Chamber (Transient) — ANSYS Fluent CFD SimulationDescriptionThis project simulates a combustion chamber in ANSYS Fluent using a transient, pressure-based solver with the effect of gravity included. Combustion is the central theme: methane is burned with air inside the chamber, and the simulation is built around capturing the chemical reaction, the resulting heat release, and the way the hot products move through the geometry. The chamber comprises three main parts — the air inlet pipe, the burner section, and the outlet pipe — and contains a thin internal wall pierced by cavities of varying size. The small primary holes cool the chamber wall through a layering film of flow, while the larger holes help anchor the flame in the center of the chamber, a configuration typical of real combustor liners. Within the Combustion: Beginner CFD Training Package, this project adds time-dependence to the combustion-chamber progression, building on the steady-state chamber toward transient flame behavior in a realistic combustor geometry.MethodologyThe geometry is three-dimensional and was created in Design Modeler, then meshed in ANSYS Meshing using an unstructured triangular grid of 694,928 elements. Because the flow inside a combustor is complex and highly turbulent, the RNG k-ε turbulence model with standard wall functions is used. Combustion itself is represented through the Species Transport model, which is the heart of the setup: it tracks each chemical constituent and the reactions that convert reactants into products while releasing energy. Air and fuel (CH₄) enter at mass flow rates of 0.02 kg/s and 0.0006 kg/s respectively, both at 300 K, and the chamber's outer wall is treated as adiabatic. The reaction is modeled as a two-step methane–air combustion involving six species — methane, oxygen, nitrogen, water vapor, carbon dioxide, and carbon monoxide — with the inlet air composed of oxygen and nitrogen at mass fractions of 0.23 and 0.77.AnalysisThe results are presented as three-dimensional volume renderings and streamlines of velocity, pressure, temperature, density, and the mass fractions of the participating species, giving a detailed view of the combustion process. Air enters around the periphery and the methane–air mixture from the bottom surface, meeting to form the combustion region. There, temperature and pressure rise sharply as the reaction proceeds, and the heated flow accelerates toward the outlet — the central behavior the simulation sets out to capture. By the end of this project, you'll be able to set up a transient Species Transport combustion simulation with a multi-step methane–air reaction, model a realistic combustor liner with film-cooling and flame-anchoring holes, and interpret the temperature, pressure, and species fields that reveal flame stabilization, heat release, and the transport of combustion products.

This tutorial presents a CFD analysis of a 2-D gas turbine combustion chamber using ANSYS Fluent.A gas turbine is a rotating machine driven by the energy released during combustion. It consists of three main components: a compressor that pressurizes incoming air, a combustion chamber where fuel and air mix and ignite, and a turbine that converts the energy of the hot, expanding gases into mechanical work. Part of this mechanical output drives the compressor itself, while the remainder powers the generator in turbo-generator setups, provides thrust in turbojet and turbofan engines, or serves other applications depending on the turbine's design.The fuel delivery system is one of the most actively developed areas of gas turbine design, with injectors playing a central role in achieving efficient combustion. This project models the combustion of a methane-air mixture inside the chamber, with methane and oxygen entering at velocities of 128.9304 m/s and 12.0396 m/s, and temperatures of 286 K and 109 K, respectively. The resulting mixture ignites, releasing energy and generating heat throughout the domain.The geometry was created in Design Modeler and discretized using ANSYS Meshing, producing a structured mesh of 197,006 cells.MethodologySince the simulation involves multiple chemical species, the Species Transport model is employed to solve the transport equations for each species, while a volumetric reaction defines the combustion process. The Eddy-Dissipation model captures the interaction between turbulence and chemical kinetics, and the real gas equation accounts for density variations of the vapor phase with temperature.ResultsThe simulation outputs contours of temperature, velocity, pressure, and species mass fractions throughout the combustion chamber, confirming that the combustion reaction proceeds as expected. Concentrations of the oxidizer and fuel are highest near the inlet and decrease progressively as they are consumed in the reaction, while combustion products such as H₂O and CO start at zero and increase steadily along the chamber. As the reaction is exothermic, it releases substantial heat, driving a marked rise in chamber temperature.

Vortex Combustion Chamber Simulation in ANSYS FluentIntroductionThis project simulates the combustion reaction occurring inside a vortex combustion chamber using ANSYS Fluent. Combustion is a chemical process between a combustible material and an oxidizing agent, resulting in the release of heat and the transformation of raw materials, typically accompanied by light in the form of a flame or glow. While combustion is fundamentally a form of oxidation reaction, its rapid reaction rate, substantial heat release, and associated temperature rise and flame formation place it in a distinct category of chemical processes. The vortex combustion chamber represents a new generation of liquid-fuel internal combustion engine design, in which a specific injector arrangement generates a swirling vortex flow. This vortex enhances cooling and improves mixing of the propulsion components within the chamber, enabling complete combustion to be achieved in a smaller chamber volume.Geometry and MeshThe combustion chamber geometry was designed and meshed within GAMBIT, using an unstructured mesh totaling 379,535 cells.MethodologyThe combustion process was analyzed using the species transport model, with a mixture of air and methane serving as the fuel. The Eddy-Dissipation method was employed to capture the chemical-turbulent interaction of the combustion reactants, and the NOx prediction model was activated, using the temperature method for the turbulence-chemistry interaction mode. The ideal gas equation was used to account for density variations resulting from temperature changes within the chamber.Results and ConclusionContours of velocity, pressure, temperature, and species mass fraction were generated in both 3D and 2D, clearly capturing the formation of the combustion flame and the resulting temperature distribution within the chamber. Velocity vectors reveal a high degree of flow turbulence throughout the domain, and the overall contour results confirm that the combustion chamber's performance has been accurately captured by the simulation.

Vortex Flame Combustion Chamber, 4-Inlet (Methane and Air) — ANSYS Fluent CFD Simulation TrainingThis project simulates the vortex flame inside a combustion chamber using ANSYS Fluent, with the full case analyzed through CFD post-processing.The geometry is a three-dimensional cylindrical combustion chamber built in Design Modeler. Air enters through four inlet sections arranged radially around the chamber, while fuel enters through four inlet sections positioned axially at the top. A single outlet at the bottom of the chamber discharges the combustion products.The mesh was generated in ANSYS Meshing using a structured grid, with a total of 725,521 elements.MethodologyThe chamber has a cylindrical structure in which the reactants — fuel and air — enter separately through four inlets in the upper region, and the reaction products exit from the bottom.Air enters radially through four inlets spaced 90 degrees apart around the outer circumference of the chamber, while methane is injected directly into the chamber interior through the remaining four inlets. This arrangement establishes the swirling, vortex-shaped flame at the heart of the model.The chemical reaction between air and methane is modeled with the Species Transport model, involving five species: O₂, N₂, CH₄, CO₂, and H₂O. The incoming air contains a mass fraction of 0.23 oxygen, with a flow rate of 0.001135845 kg/s at 300 K. The fuel enters simultaneously at a flow rate of 0.0000645 kg/s, also at 300 K.The outer wall is treated as a convective boundary exchanging heat with the surroundings, with an ambient (free-stream) temperature of 300 K and a heat transfer coefficient of 25 W/m²·K.The RNG k-epsilon turbulence model and the energy equation are both activated to resolve the turbulent flow field and compute the temperature distribution throughout the domain.ResultsThe solution yields 2D and 3D contours of pressure, temperature, velocity, and the mass fractions of O₂, CH₄, H₂O, CO₂, and N₂.The contours show that as combustion takes place between fuel and air, temperature rises sharply near the chamber inlets. As the reaction proceeds, the methane mass fraction decreases while the mass fractions of the combustion products — CO₂ and H₂O — increase accordingly.

Diesel Fuel Combustion in a Gas Turbine Combustion Chamber — ANSYS Fluent CFD Simulation TrainingThis project simulates the combustion of diesel fuel inside the combustion chamber of a gas turbine system using ANSYS Fluent, with the full case analyzed through CFD post-processing.The combustion chamber works as follows: air enters from the space surrounding the chamber, passes through a bladed diffuser duct where it becomes turbulent, and then enters the dedicated combustion space to mix more effectively with the fuel. The fuel, meanwhile, is injected into the chamber through a nozzle and mixes with the incoming air, allowing combustion to take place. The fuel used is diesel (C₁₆H₂₉), which reacts with the airflow.The combustion reaction involves four species — diesel, hydrogen, oxygen, and carbon — so the Species Transport model is used to define the gaseous species, together with the volumetric reaction model to govern the reaction between them. Air enters the chamber at a velocity of 3 m/s and a temperature of 300 K, while diesel is sprayed into the chamber interior at 4 m/s and 300 K. The aim of the study is to investigate the mass fractions of the reactants and the combustion products.The 3D geometry was created in Design Modeler and meshed in ANSYS Meshing using an unstructured grid, for a total of 3,488,057 cells.MethodologyThe Species Transport model is used to analyze the combustion process, and the energy equation is activated to compute the temperature changes throughout the domain.ResultsOnce the solution is complete, 2D and 3D contours of pressure, temperature, velocity, and the mass fractions of diesel, oxygen, carbon dioxide, and water vapor are obtained.The contours show that the fuel mixes well with the oxidizer and that combustion takes place, with its products clearly visible. The temperature is very high in parts of the combustion chamber, and the results show that the combustion flame is well formed.

Gas Flare, Two-Step Air–Methane Mechanism Combustion, ANSYS Fluent CFD Simulation TutorialDescriptionThis project simulates combustion in a gas flare, using a two-step methane–air mechanism, in the presence of a crosswind, with ANSYS Fluent.This case is a clear example of a reacting flow, where the fluid motion and the chemistry are solved together: the flow carries fuel and air into the flame, the combustion reactions release heat and change the gas composition, and the resulting temperature and density fields feed back into the flow. Modeling this coupling is exactly what the reacting-flow (species transport) approach is built for.A gas flare is a combustion device used in industrial facilities such as oil and gas refineries and at production wells, particularly on offshore platforms, to safely burn off natural gas.The 3-D geometry was built in Design Modeler. Because the flare is symmetric, only half of it is modeled to cut the computational cost, with a symmetry boundary condition applied. The flare has a cylindrical body with four outlet ducts and sits inside a computational domain that carries the wind flow; this domain is likewise halved along the symmetry plane. The model was meshed in ANSYS Meshing with 1,546,925 elements.Simulation MethodologyGas flares burn the natural gas released during oil extraction. During extraction, natural gas accumulates above the oil in the reservoir. Collecting and storing this gas is preferable, but where that is not possible it is flared. Burning the gas in a flare avoids uncontrolled, hazardous release, and converting methane to carbon dioxide before it reaches the atmosphere is less harmful than releasing the methane directly.To capture the chemistry, the species transport model is used with volumetric reactions enabled, and the eddy-dissipation model estimates the reaction rate. A methane–air mixture burns through a two-step mechanism: first methane and oxygen react to form carbon monoxide (and water), then the carbon monoxide combines with oxygen to form carbon dioxide. Air enters the domain at 0.2 m/s and 300 K, and the fuel enters at 0.1 m/s and 300 K. The realizable k-ε model and the energy equation are enabled to solve the turbulent flow and compute the temperature distribution.Results & ConclusionAfter solving, two- and three-dimensional contours of pressure, temperature, velocity, and the mass fraction of each modeled species were obtained, with the two-dimensional contours shown on the geometry's symmetry plane.The species mass-fraction contours confirm that the reaction takes place: the carbon dioxide and carbon monoxide contours show these products being generated, while the methane contour shows the hydrocarbon being consumed as the reactant. The contours also show that the crosswind carries the combustion products, such as carbon dioxide and carbon monoxide, away from the flare and disperses them into the surrounding environment.

DescriptionThis project simulates combustion in a gas flare system using ANSYS Fluent, investigated through CFD analysis. The model was built in 3D using Design Modeler. Owing to the symmetrical structure of the flare and to reduce computational cost, only a 120-degree segment of the geometry was modeled.The flare has a cylindrical structure situated within a cylindrical computational domain. Several distinct sections — steam, gas flow, and pilot — are defined at the tip of the flare. Meshing was performed in ANSYS Meshing, producing 1,043,138 elements.MethodologyA flare system, or gas flare, is a combustion device used in industrial facilities such as oil and gas refineries and at oil and gas production wells, particularly on offshore platforms, to safely burn off surplus hydrocarbon gases. The Species Transport model was used to carry out this simulation.The reacting mixture is defined as an n-butane–air blend consisting of nine gaseous species: C₄H₁₀, O₂, CO₂, H₂O, H₂, CH₄, C₂H₆, C₃H₈, and N₂. The volumetric reaction model was activated to enable the chemical reactions and, in turn, the combustion process, which is represented by five distinct chemical reactions.At the flare tip, a stream of hydrocarbon gas enters the environment at a flow rate of 0.09259 kg/s. Simultaneously, a methane flow from the pilot and a steam flow from the steam inlet — both at velocities of 2.479 m/s — enter the domain to ignite the mixture. The standard k-epsilon model was used to solve the turbulent flow equations, together with the energy equation to compute the temperature variation within the combustion region.ConclusionOn completion of the solution, three-dimensional contours of velocity and of the mass fraction of each modeled gas species were obtained.For instance, examining the three-dimensional contour of carbon dioxide clearly shows that the combustion reaction and the resulting production of CO₂ are taking place. As the results also demonstrate, the mass fractions of the fuel species decrease with distance from the fuel inlet, while the mass fractions of the reaction products correspondingly increase along the same direction — confirming the progress of combustion through the domain.