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Computational Fluid Dynamics – CFD

Research into fluid dynamics does not always require experimental apparatus. The flow field can be simulated on a computer using computational fluid dynamics, or CFD.

In many cases, the image of the flow field is much more detailed than one that would be possible to achieve through taking measurements.

The concept is similar to principles used in strength analysis using the Finite Element Method (FEM).

Steps in Computational Fluid Dynamics

  • 3D model creation of the flow area
  • Calculation grid creation for the flow area
  • Definition of the starting values and boundary conditions
  • Numerical solving of the flow equations
  • Post-processing of the results, graphic visualisation, and evaluation

Fluid Dynamics Laboratory CFD Tools

  • Finflo, a flow-solving programme created by the Helsinki University of Technology
  • Fluent, a commercially available CFD calculation programme
  • GridGen, a programme for grid creation and pre-processing
  • IGG, a programme for grid generation and pre-processing
  • Fieldview, a programme for post-processing and visualization

Examples of CFD simulations

The pressure distribution and power lines in a radial compressor and bladed diffuser

The flow rate at different sections of a centrifugal compressor's flow channel

Supersonic turbine stator nozzle

Original geometry, in which the flow is unevenly accelerated during the CFD simulation.

An improved version, which accelerates steadily up to more than double the speed of sound.