CFD modelling of combustion and industrial multiphase flows

Computational Fluid Dynamics (CFD) is a powerful and affordable tool to enable deep understanding of and to design various industrial flow processes such as combustion in boiler furnaces, chemical reactors and other mixing processes. VTT offers a wide range of expertise in CFD modelling and simulation of combustion and other industrial processes and equipment. The development and computationally efficient implementation of models describing the relevant physical and chemical phenomena is an essential part of our research work.


Industry is facing growing demands for new and more efficient processes owing to the need to reduce emissions and to utilize raw materials more economically. In process design, detailed modelling using CFD and other techniques is necessary to achieve these goals. The challenge of modelling is increasing because the processes are complex, involving complicated geometry, chemical reactions, mass and heat transfer, multiphase flows, and sometimes complex rheology.


  • Reduction of emissions, firing different fuels, co-firing, oxyfuel combustion:
    - CFD studies of combustion, heat transfer, slagging tendencies and pollutant formation in boiler furnaces to investigate and develop combustion processes
  • Industrial process design and safety:
    - CFD studies of chemical reactors and process industry equipment
    - Applications of three-dimensional CFD in nuclear safety analysis
    - Analysis of fouling and corrosion with detailed chemical and molecular modelling
  • Development and application of multiphase CFD models for fluidized beds, flotation and fixed catalytic bed reactors, etc.
  • Innovative combination of different modelling approaches with CFD (e.g. FEM for fluid-structure interaction, multiblock modelling, cellular automata, molecular modelling)


  • Fast testing of new design concepts
  • Detailed information of process conditions even when measurements are difficult
  • Improved understanding of process performance and controlled process chemistry
  • New innovative breakthroughs

References and merits

  • Large group of modelling experts with wide experience in CFD, molecular modelling and numerical methods
  • Long-term partnership with major companies in the energy and process industries
  • Active cooperation with universities and research institutes and other teams of VTT 

See also

High performance of boilers