Combustion Chamber (Transient) ANSYS Fluent CFD Simulation Tutorial

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  • In this project, a combustion chamber is simulated by ANSYS Fluent software applying a Transient and Pressure-based solver, considering the gravity effect.
  • The geometry of the present model is 3-D, and Design Modeler software designs it.
  • ANSYS Meshing software performs the meshing of the current model. The element number is equal to 694928.
  • The Species Transport Model is activated to model the combustion.
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Combustion Chamber (Transient) Description

In this project, we simulate a combustion chamber by ANSYS Fluent software applying a Transient and Pressure-based solver, considering the gravity effect. Inside the combustion chamber are three main parts: the air inlet pipe, the burner section, and the outlet pipe.

Inside the chamber is a thin wall with several cavities of varying dimensions. The small primary holes for cooling the chamber wall by layering flow, and the next big ones are to keep the flame in the middle of the chamber. The geometry of the present model is 3-D, and Design Modeler software designs it.

ANSYS Meshing software performs the meshing of the current model. The mesh type is unstructured. We use a triangular grid, and the element number is 694928.


We simulate the combustion chamber by applying a Transient and Pressure-based solver, considering the gravity effect. We use the Standard Wall Function and K-epsilon RNG model for the turbulence equation since the flow inside the chamber combustion is relatively complex.

We apply the Species Transport Model to model the combustion. Mass flow rates of the air and the fuel (CH4) equal 0.02 kg.s-1 and 0.0006 m.s-1, respectively, with a temperature of 300k. Also, the chamber’s outer wall is adiabatic. in this case, there are two steps of methane-air combustion, with six species involved in the reaction: methane, Oxygen, nitrogen, water vapor, carbon dioxide, and carbon monoxide.

Mass fractions are .23 and .77 for Oxygen and nitrogen, respectively.

Combustion Chamber (Transient) Conclusion

For the current simulation, we present both Volume rendering(3D Contour) and streamlines of velocity, pressure, temperature, density, and mass fraction of components to give much insight into the problem. Briefly, the air and Methane-air enter the domain from the around and bottom surfaces of the geometry, respectively, and make a combustion region.

Temperature and pressure increase and the flow then goes to the outlet at a higher speed, as depicted in the Figures, which is the main challenge of this simulation.


  1. Avatar Of Johathan Dach

    Johathan Dach

    I’m interested in buying this product, but I have a question. Can you customize the simulation parameters according to my specifications? For example, can you change the fuel type, the compression ratio, or the ignition timing?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Yes, we can customize the simulation parameters according to your needs. We have a team of experienced engineers who can modify the simulation setup and run different scenarios for you. You can contact us at [email protected] and let us know what kind of simulation you want. We will get back to you with a quote and a delivery time.

  2. Avatar Of Elias Paucek

    Elias Paucek

    I have a suggestion for your product. Can you add some features that allow me to visualize the results in different ways? For example, can you show me the contours of temperature, pressure, velocity, or species mass fraction on different planes or surfaces? Can you also show me some animations or videos of the combustion process?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your suggestion. We appreciate your input and we are always looking for ways to improve our product. We already have some features that allow you to visualize the results in different ways using ANSYS Fluent post-processing tools. You can see some examples of these features in our tutorial. However, we are also working on adding more features that will enhance your visualization experience. You can expect to see some updates on our product soon or contact us via [email protected].

  3. Avatar Of Dr. Modesto Gibson Phd

    Dr. Modesto Gibson PhD

    I really like your product, but I’m not sure if I can afford it. How much does it cost? Do you offer any discounts or payment plans?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Our product is very affordable compared to other CFD solutions in the market. The price of our product depends on the complexity and duration of the simulation, as well as the number of licenses required. You can check our pricing page for more information. We also offer discounts for students, researchers, and bulk orders. You can also pay in installments if you prefer. Please contact us at [email protected] and we will be happy to assist you.

  4. Avatar Of Prof. Elbert Kuphal V

    Prof. Elbert Kuphal V

    I found the use of different cooling hole sizes for layering flow and flame retention fascinating. Is there a particular reason for the sizes chosen in the design of the cooling holes, or were they determined through trial and error?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      The sizes of the cooling holes in the chamber wall were carefully chosen based on theoretical calculations and simulation testing. They are designed to optimize heat transfer and to ensure that the flame is maintained appropriately in the middle of the combustion chamber. The smaller holes are engineered to provide sufficient cooling by layering the flow of combustion gases, while the larger ones are designed to influence the flame position and stability. The exact dimensions are a result of design optimization and computational analysis.

  5. Avatar Of Darby Marks Jr.

    Darby Marks Jr.


  6. Avatar Of Enid Reichert

    Enid Reichert

    What model is used for turbulent chemistry interaction?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      In this project, it is assumed that the speed of the chemical reaction after mixing fuel and air is infinite and occurs as soon as the chemical reaction is mixed; for this purpose, the eddy dissipation model is used.

  7. Avatar Of Precious Watsica

    Precious Watsica

    Wow, this is amazing! I love how you simulated the combustion process in such a realistic way. How did you do it?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your kind words. We used ANSYS Fluent software to model the combustion chamber as a transient problem. We applied the species transport model and the eddy dissipation concept to account for the chemical reactions and the turbulence effects. You can find more details about our simulation setup and results in our tutorial.

  8. Avatar Of Verona Weissnat

    Verona Weissnat

    Is radiation considered in this combustion chamber simulation and how do you account for different materials sensitivity to temperature?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      For this simulation, there’s no specific mention of radiation being considered, but it’s commonly included in combustion simulations because it can significantly affect temperature distribution and emissions. Material sensitivity to temperature is typically accounted for by setting temperature-dependent material properties within the simulation software, such as specific heat capacity, thermal conductivity, and emissivity values.

  9. Avatar Of Odie Hartmann

    Odie Hartmann

    Can we adjust the mass flow rates to simulate different intensities of combustion within the chamber?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Yes, it is possible to adjust the mass flow rates of air and fuel (CH4) in the simulation to study different combustion intensities within the chamber.

  10. Avatar Of Marlee Hoppe

    Marlee Hoppe

    The tutorial that taught me to simulate a combustion chamber was very informative. Being able to account for gravity effects and using Species Transport Model advanced my understanding of combustion processes significantly.

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your review! We’re delighted to hear that our Combustion Chamber ANSYS Fluent CFD Simulation Tutorial was helpful to you. It’s great to know you’ve gained valuable insights into combustion modeling and species transport. If you have any more feedback or need further assistance, don’t hesitate to reach out to us!

  11. Avatar Of Dell Boyle

    Dell Boyle

    I’m impressed with the capability to simulate combustion in a transient state with ANSYS Fluent. How does the solver ensure accuracy during these transient simulations?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      MR CFD’s admin is happy to elaborate! The solver ensures accuracy in transient combustion simulations through refined mesh settings, robust numerical models like the Species Transport Model, and detailed initial conditions for turbulence, fluid flow, and chemical species. Time-step management and convergence criteria are also suitably selected to capture the fast transient phenomena accurately within the combustion chamber.

  12. Avatar Of Mr. Carroll Rodriguez Phd

    Mr. Carroll Rodriguez PhD

    This simulation pack was particularly insightful! Will there be advanced tutorials that delve into the optimization of combustion chamber designs?

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Thank you for your positive feedback on the Combustion Chamber (Transient) simulation tutorial! Currently, we offer a range of guides and tutorials focused on CFD simulations in various applications. We always consider the interests of our users. We suggest regularly checking our website for updates or subscribing to our newsletter for announcements on any new advanced optimization tutorials for combustion chamber designs.

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