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Fluid mechanics
Fluid mechanics

Combustion and Reactive Flows with Ansys Fluent

Overview

Training Expert

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

Benefits
  • 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
Consultant, CADFEM Afrique du Nord s.a.r.l.

Placement in the CADFEM Learning Pathway

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When will I receive the final confirmation for my training booking?

Straight after you sign up, an automatic confirmation of receipt will be sent to the email addresses you provided. Once you have successfully verified the data you provided, you will receive your personalized sign-up confirmation, containing further information on course fees, the billing address, etc., by email within two to three working days.  

As soon as the minimum number of attendees has been reached, you will receive a final training confirmation containing further information. If you have booked an on-site training, we recommend that you wait until you have received this final confirmation before booking your travel and accommodation.

If the minimum number of attendees is not reached, we reserve the right to cancel the training seven days before it is due to start at the latest. We are happy to inform you on changing your booking to an alternative date. Please note that we accept no liability for hotel or travel bookings that attendees have already made.

When is the sign-up deadline for a training?

Training places will generally be allocated based on the order in which attendees sign up. For this reason, we always recommend booking for your desired date as early as possible.

As long as a coures still has free places, it can be booked.

At what time do the training courses begin and end?

Usually the training courses start at 9:00 am and end at 5:00 pm of the respective local time. The actual course times will be stated in the booking confirmation. Please note that, depending on the training host, there may be a possible time shift between your and the provider's local time. Therefore all local times are provided with the valid time shift to Greenwich Mean Time (GMT). 

Technical Manager