Discussion on Numerical Modelling of Physical Processes in a Combustion Engine∗

The contribution presents our approach to numerical modelling of processes in a combustion engine and its present situation. The modelling was motivated by the aim of computation of production of nitrogen oxides during the work cycle of such engine. There are the models of flow of compressible gas, heat and mass transport, and chemical reactions and their connection presented here. The model of flow is made by solution of Navier-Stokes and compressible continuity equations by the finite element method. Transport problem is described by the advection equation and the energy equation; both are solved applying the finite volume method. Chemical reactions are modelled locally in each finite volume. All three models use the same mesh in each time step; the mesh is changing in time.