Premixed Combustion Eddy Dissipation CFD Simulation

Premixed Combustion Eddy Dissipation CFD Simulation

Welcome to the third episode of our “Combustion: All Levels” course. In this comprehensive lesson, we’ll dive deep into the world of premixed combustion simulation using ANSYS Fluent CFD software. This episode focuses on the Eddy Dissipation model and its application in combustion chamber analysis.

Overview of the Simulation

Our simulation revolves around a two-dimensional combustion chamber model, where we’ll explore the intricacies of premixed combustion. We’ll use the Species Transport model and employ the Eddy Dissipation approach to account for turbulence-chemistry interactions.

Geometry and Meshing

We begin by creating our model using Design Modeler software. The meshing process, a crucial step in CFD simulation, is performed using ANSYS Meshing software. Our model features:

• A structured mesh type
• 86,002 elements for accurate results

Simulation Methodology

Species Transport Model

We utilize the Species Transport model to simulate the combustion process. This approach allows us to:

• Model a one-reaction methane-air mixture
• Use the volumetric option for chamber combustion modeling

Eddy Dissipation Model

The Eddy Dissipation model is key to our simulation, as it:

• Accounts for turbulence-chemistry interactions
• Focuses on mixing effects rather than detailed kinetic mechanisms

Additional Settings

To ensure a comprehensive simulation, we also:

• Enable the Energy equation to calculate temperature changes
• Set the Viscous model to Standard k-epsilon

Simulation Results and Analysis

Upon completion of the simulation, we’ll analyze various contours and data, including:

• Temperature distribution
• Velocity profiles
• Mass fractions of different species
• Streamlines showing secondary flows

These results will provide insights into the combustion process, temperature increases, and the role of secondary flows in enhancing fuel-air mixing and combustion efficiency.

Conclusion and Learning Outcomes

By the end of this episode, you’ll have a solid understanding of:

• Premixed combustion simulation techniques
• The application of the Eddy Dissipation model in CFD
• Interpreting CFD results for combustion chamber analysis
• The importance of secondary flows in combustion processes

Join us in this exciting exploration of premixed combustion simulation and take your CFD skills to the next level!