Combustion and Reactive Flows with Ansys Fluent
Learn how to model combustion processes using CFD, predict combustion realistically and related processes further. This training is offered as a 3-day course.
Duration
3 days
Prerequisites
Basic knowledge of Ansys Fluent
Software used
Ansys CFD
- Understanding and influencing combustion processes in details
- Task-specific selection of chemical models
- Acquire virtual measurements even in inaccessible places
- Clean combustion: reduce the development of pollutants
Description
Combustion processes involve a variety of physical phenomena that interact and influence each other. Modelling and simulation of combustion processes with the help of Computational Fluid Dynamics (CFD) offer a fast, cost-effective extension to experiments, for example to design new equipment. Very detailed information can be obtained even in locations that are not accessible in the experiment. Further advantages of combustion simulation include the prediction of pollutant development and the optimization of apparatus.
In the workshops, you will learn how to influence combustion processes in detail. With the help of simulation, you can place virtual measuring sensors at any desired position. Depending on the problem, you will be able to choose the appropriate models to describe the chemistry and improve the combustion process; for example to reduce pollutants.
This course is aimed at advanced users who have previous knowledge of CFD and want to deepen their knowledge in reacting CFD flow.
Detailed agenda for this 3-day training
Day 1
01 Basic concepts of reacting flows
- Important parameters: stoichiometry, reaction rate, chemical equilibrium, Dammköhler number, diffusion flame, premixed combustion
- References to common literature
- How to use the software help
- Workshop: Simple global reaction: Methane combustion in a combustion chamber
02 Species transport, detailed chemistry and turbulence-chemistry interaction
- Detailed description of chemical reactions: advantages and disadvantages
- Turbulent mixing
- Fast reactions: Eddy Dissipation Model
- Model Setup
- Workshop: Eddy Dissipation model for the simulation of a 300 KW combustion chamber
03 Chemistry with finite reaction rates (Finite-Rate Model)
- Description of slow chemistry: Laminar Finite Rate, Eddy Dissipation Concept (EDC)
- Solution methods and acceleration procedures for detailed reaction mechanisms
- Plausibility check of the simulation results (adiabatic flame temperature, source term for reaction heat)
- Hints/Best Practice for mesh generation: How fine do you need to resolve?
- Workshop: Methane-air mixture combustion in a conical reactor
04 Reducing the computation time for large reaction mechanisms
- Extended workshop: Detailed modelling of the Sandia-D flame with more than 300 reactions
- Comparison between Finite-Rate and Eddy-Dissipation Model
- Application of the Stiff Chemistry Solver
- Apply the acceleration methods for a faster calculation of combustion
Day 2
05 Simulation of turbulent diffusion flames
- What are diffusion flames?
- Modeling based on the fuel-oxidant mixture (concept of mixture fraction)
- Non adiabatic systems and heat losses
- Reducing the computing time through the concept of chemistry tabulation
- Workshop: Flamelet method for calculation with a detailed chemical mechanism
06 Premixed and partially premixed combustion
- Advantages of premixed combustion
- Quantifying the combustion progress: C-equation (reaction progress variable)
- Partially premixed flames
- Reducing the computing time through Flamelet Generated Manifold (FGM)
- Workshop: Premixed combustion in a conical chamber using the Zimont model
07 Combustion of liquid fuels
- Introduction of the Discrete Particle Model (DPM)
- Evaporation of droplets
- Mixture preparation for optimum combustion
- Homogenization of the mixture and temperature distribution
- Workshop: Liquid fuel combustion using the premixed flame model
08 Spray combustion in complex configuration
- Extended workshop: Application of DPM in combustion simulation
- Phase transition with DPM and mixture formation
- Partially premixed spray combustion
- Application in complex geometry (Co-axial combustion chamber)
- Creation of FGM table for combustion
Day 3
09 Surface reaction and combustion of solid particles
- Pyrolysis of solid fuels
- Combustion of solid particles
- Absorption and desorption of species
- Validation of the combustion simulation
- Model Setup
- Workshop: Catalytic combustion of methane with surface reactions on walls
10 Radiation in combustion
- Importance and estimation of radiation effects
- Quantification: Radiation intensity and Radiation heat flux
- P1 radiation model
- DO-radiation model
- Absorption of radiation energy in the fuel-gas mixture: importance material properties
- Model Setup
- Workshop: Simulation of a flame under consideration of the radiation
11 Emission and reduction of pollutants
- Simulation-based estimation of pollutant formation (NOx, SOx)
- NOx formation mechanisms
- Methods to avoid and reduce NOx
- SOx determination in postprocessing
- Formation methods for soot
- Determination of pollutants concentration distribution
- Workshop: Simulation of NOx reduction by urea injection (SNCR)
12 Simulation of the burning of solid fuels
- Extended Workshop: DPM for the combustion of particles
- Burning of coal: drying, pyrolysis and heterogeneous oxidation
- Detailed description of the chemistry (6 reactions and 7 species)
- Setting up the model and solver
- Post-processing of the results
- Overview of complementary tools: Chemkin-Pro (Reaction Design), Model Fuel Library
Your Trainers
Dr.-Ing. Mouldi Chrigui
Placement in the CADFEM Learning Pathway
Participant data
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Commentary
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