12
Conclusion
Since 1998, during my activity at the FKFS and IVK University of Stuttgart an innovative fast-
response 3D-CFD tool has been developed. This tool aims for a better integration in the
development process of internal combustion engines and represents a step towards virtual engine
development. A more reliable calculation of the engine processes for engineering purposes and a
clear representation of the results allow a more comprehensive analysis of the engine behavior.
In addition comparisons with experimental data or results from other simulation tools can be
easily and efficiently performed. The 3D-CFD-domain is not, as usually, limited to the
simulation of the cylinder alone, but can be extended up to the full engine. This allows a more
predictive simulation by reducing the effects of the boundary conditions on the results. The
simulation run is always performed over many operating cycles so that the convergence of the
results can also be proofed.
Within a 3D-CFD-simulation with
QuickSim both an evaluation tool and a real working-process
analysis are operative. This strategy allows an “online” analysis of the average relevant results
from the flow field and establishes a comparative investigation with the real working-process
analysis under the same thermodynamic conditions. This information network helps not only
better investigating the phenomena occurring in the engine, but also sets the requisites for a more
advanced and reliable modeling of engine processes. Each 3D-CFD-engine-model is a modular
object within a network of local and global variables, which in dependence of their numerical
reliability can be easily used and combined in the chosen formulation (“internal coupling”).
Following this procedure the local implementation of 3D-CFD-engine-models, e.g., can also rely
on typical and reliable phenomenological correlations used for global investigations of engine
processes. Concluding, the engine-process modeling in
QuickSim aims pragmatically to find the
best compromise among the physical understanding of the phenomenon, the mathematical
formulation, the algebraic description and the numerical implementation of the model also using
coarse meshes. In contrast to the common practice, the dimensions of the cells within the 3D-
M. Chiodi, An Innovative 3D-CFD-Approach towards Virtual Development of
Internal Combustion Engines, DOI 10.1007/978-3-8348-8131-1_12,
© Vieweg+Teubner Verlag | Springer Fachmedien Wiesbaden GmbH 2011