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.

DescriptionThis project uses ANSYS Fluent to simulate multi-jet ethylene-air combustion, applying species transport and reacting flow modeling to a core problem in chemical reaction flow engineering. The simulation examines how multiple angled jets mix and react, capturing the interaction between turbulent flow, species transport, and chemical reaction — relevant to combustion systems across aerospace propulsion, gas turbines, and industrial furnaces.MethodologyA 2D combustion chamber geometry with multiple jet inlets is built in DesignModeler and meshed in ANSYS Meshing using a structured grid of 9,928 elements. The simulation uses a pressure-based, steady-state solver, with the Species Transport model configured for volumetric reactions to represent ethylene-air combustion, and the Eddy-Dissipation model applied to capture turbulence-chemistry interaction.ConclusionResults include pressure, velocity, and temperature contours, along with species concentration distributions showing combustion product formation. The simulation reveals how jet velocity and angle affect mixing and combustion behavior, temperature distributions and peak combustion zones, and the formation of combustion products relevant to emissions. These findings support combustor design optimization for improved combustion efficiency and reduced emissions across aerospace, power generation, and industrial thermal systems.

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.

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.

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.

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.

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 the combustion reaction — fire and smoke — arising from a leaking pressure tank in a factory using ANSYS Fluent. The factory is modeled as a computational domain containing several elements such as tanks, plates, and boxes. A cylindrical pressurized tank develops a leak, releasing flammable methane gas into the surrounding environment; the contact of this methane with the free ambient air then leads to a combustion reaction.The aim of the project is to investigate the behavior of the combustion flame and the path of smoke emission over time, so the simulation is carried out in a time-dependent (transient) manner.The study proceeds in two steps. The first step examines only the leakage of methane from inside the tank into the surrounding space, with methane released gradually over time. The second step allows this leaked gas to react with the air and ignite, producing flame and smoke (carbon dioxide) through the combustion reaction. In the first step there is no need to define a chemical reaction — only air and methane are present, without reaction. Both the factory air and the methane inside the tank are under pressure; a groove at the top of the tank serves as the leakage point, and assigning a higher initial pressure to the methane drives its release into the outer environment. Once the release has fully developed, the combustion reaction between methane and the free air is defined using stoichiometric coefficients, with methane and oxygen as reactants and carbon dioxide and water vapor as products. A spark is also defined at the groove section of the tank to initiate combustion.The geometry was created as a 3D model in Design Modeler, and meshing was performed in ANSYS Meshing using an unstructured grid of 124,162 cells.MethodologyThe viscous model used is RNG k-epsilon with standard wall functions. The solver is transient, and the energy equation is enabled to capture the temperature field. The Species Transport model is used to simulate the combustion reaction.ConclusionAfter the simulation, the behavior of the reactants and reaction products was examined. To study the flame, an iso-surface at a constant temperature was used, with the flame temperature taken as the measure representing the flame's extent. To investigate the smoke produced by combustion, the behavior of carbon dioxide — defined as a product of the reaction — was examined, using its mass fraction as the iso-surface measure. Similarly, the leaked methane was tracked using its mass fraction as an iso-surface measure. Methane leakage before combustion, and the flame and carbon dioxide emission after combustion, were all studied at different time instants and presented as animations.In the first step, the results clearly capture the leakage process: methane first fills the pressurized tank, then, once the leak occurs, escapes into the surrounding environment at high pressure. In the second step, the results show the onset of the combustion reaction. The temperature rises sharply as a result of the explosion; the flame grows at the start of combustion and then gradually fades over time. Carbon dioxide is produced throughout the space, confirming that combustion has taken place, since this gas is the product of the reaction — it too erupts at the moment of ignition and diminishes in volume as time progresses.

Coronavirus Spread Due to a Cough in Open Air — ANSYS Fluent CFD Simulation TrainingThis project simulates the spread of coronavirus particles resulting from a human cough in open-air conditions, using ANSYS Fluent. When an infected person coughs, virus-laden particles disperse through the air and can potentially reach and infect a nearby healthy individual. Understanding this process, and determining the minimum safe distance needed to limit transmission, has become one of the most actively studied topics in CFD research, commonly referred to as social or physical distancing.The model consists of a human figure placed within a cube-shaped domain representing the open-air environment, with the mouth defined as the source of virus-carrying droplets. The 3-D geometry was created using SolidWorks and Design Modeler, and meshed in ANSYS Meshing with an unstructured mesh, refined further near the mouth region. The total element count is 584,587.MethodologyA two-way coupled Discrete Phase Model (DPM) is used to capture the unsteady behavior of the dispersed droplets and their interaction with the surrounding continuous airflow. The model accounts for stochastic collision, coalescence, and breakup of droplets. Droplets are injected at a temperature of 310 K, a velocity of 31.85 m/s, and a flow rate of 0.018 kg/s, released over a time interval of 0 to 0.1 s.Since droplet sizes vary, the Rosin-Rammler logarithmic distribution is used to define the diameter range, including the minimum, maximum, and mean diameters, the spread parameter, and the number of diameter classes per injection. The Species Transport model is enabled alongside the droplet model to capture droplet evaporation, meaning the airflow field around the patient is solved together with species mixing.ResultsThe simulation tracks the virus-laden particles over time, producing an animation that shows their release and gradual dispersal. Snapshots of the particle distribution at different time steps are also extracted. The results illustrate how the virus spreads during a cough event in open air, covering the period from 0.1 s to 1.75 s.

Decomposition of MgO with Argon Gas for Magnesium Particle Production — ANSYS Fluent SimulationIntroductionThermal decomposition, or thermolysis, is a chemical breakdown driven by heat. The decomposition temperature of a substance is the temperature at which it chemically breaks apart. Such reactions are typically endothermic, since energy is required to sever the chemical bonds within the compound. In line with the equation below, the decomposition of magnesium oxide is an endothermic reaction, and here the process is driven by preheating the system with argon gas:MgO(s) → Mg(s) + O₂(g)This project presents a Computational Fluid Dynamics (CFD) simulation of a magnesium–oxygen (Mg–O) thermal reaction using ANSYS Fluent. The aim is to investigate the coupled interactions between fluid flow, heat transfer, and chemical reaction within a specialized reactor geometry. A clear understanding of these processes is essential for optimizing the design and operation of Mg–O-based energy systems, which hold promise for clean energy production and storage.The geometry was created in ANSYS Design Modeler and meshed in ANSYS Meshing, producing a structured grid of 53,760 elements. This level of refinement provides a good balance between computational accuracy and efficiency.MethodologyA steady-state, pressure-based solver was used together with the SST k-omega turbulence model. Reaction modeling was handled with the Species Transport model coupled to the Eddy-Dissipation turbulence-chemistry interaction. The Discrete Phase Model (DPM) was activated to capture particle behavior, with droplet-type particles evaporating from the MgO-particle phase into the MgO-fluid phase.For the boundary conditions, argon gas together with MgO particles is injected from the right inlet, while argon gas alone enters from the left inlet.ConclusionThe CFD simulation of the Mg–O thermal reaction offers valuable insight into the coupled processes occurring inside the reactor. The key findings are as follows:Static Pressure — The pressure field ranges from −1.893 to 2.994 Pa, with higher values near the walls and lower values in the central region, a distribution that promotes reactant mixing.Temperature — Temperatures span 300–700 K, peaking in the lower chamber and at the outlet, which marks the primary reaction zone.Velocity — Velocity magnitudes range from 0 to 2.199 m/s, with complex flow patterns and recirculation zones that enhance mixing and boost reaction rates.Species Distribution — The Mg mass fraction (0–0.06) is highest in the lower chamber, coinciding with the high-temperature regions. The MgO-fluid mass fraction (0–0.1) peaks in the central chamber, illustrating product formation and transport. The O₂ mass fraction (0–0.039) is inversely correlated with the Mg concentration, confirming the progress of the reaction.Together, these results demonstrate the interplay between fluid dynamics, heat transfer, and chemical reaction. The reaction is most intense in the lower chamber, where significant recirculation strengthens mixing, and the formation and distribution of the MgO-fluid product are clearly observed.