Technical Paper
Engine Flow Calculations Using a Reynolds Stress Model in the Kiva-II Code
1996-02-01
960636
Numerical simulation is now a more and more commonly used tool to investigate flows inside IC engine combustion chambers. A key parameter of these codes is to simulate accurately turbulence since it describes the flow structure and turbulence results are inputs for combustion and spray models. In usual industrial codes, in-cylinder flows are calculated with the standard k - ε model. Nevertheless, deficiencies of this model for engine flow simulations are now well known. The turbulence anisotropy due. to the volume variation in the cylinder axis direction can not be taken into account by the k - ε model since it is based on the hypothesis of a single turbulent velocity scale. Moreover, this model is deficient to simulate swirling flows and it poorly predicts recirculating zones (these two kinds of flows are frequently encountered in combustion chambers).