Transient fluid flow, ignition and premixed combustion in a moving boundary geometry representing a cylinder of an internal combustion
engine.
Physics and modelling
Favre-averaged time-dependent turbulent compressible combusting fluid flow model. The flow is represented by the Favre-averaged
compressible formulation of the Navier-Stokes equation. Turbulence is modelled using the standard k-e turbulence model with wall functions. The combustion
process is modelled with the Weller 2-equation model. The geometrical changes due to piston motion with a moving mesh. The top-level OpenFOAM executable
assembles all the necessary models from the libraries listed below. The selection of models is made at run-time and the mesh motion is defined simply by specifying
the operating parameters for the engine. In this setup the changes to modelling choices or operating conditions for the engine are simple and quick. The simulation
presented here uses the customizable “time-format” of the OpenFOAM database so that the results are organised according to the crank angle (DCA) rather than in
time.
OpenFOAM solver
XiFoam, using the compressibleTurbulenceModels, thermophysicalModels (basic, combustion and laminarFlameSpeed); meshMotion and engine libraries.
Images and animations
The animation presented shows the propagation of the flame front during combustion.
