an innovative 3d cfd approach towards virtual development of internal combustion engines pdf

In this work the development of a new 3D-CFD-tool called QuickSim as a new approach in the
three dimensional analysis of internal combustion engines is presented. This tool tries to take
advantage of the potentiality of the traditional 3D-CFD-approach combined with a remarkable
reduction of the above mentioned drawbacks so that a major contribution in engine development
process can be ensured.

The peculiarities of QuickSim are: fast analysis calculations, reliability, user-friendliness, clear representation of the results without ambiguity and cost efficiency. Moreover this simulation tool aims for a higher integration into the existent engine development process so that a more efficient comparison with both experimental data and other simulation programs can be achieved.

More precisely QuickSim is a 3D-CFD-tool exclusively dedicated and optimized for the
simulation of internal combustion engines (gasoline, diesel, CNG and other alternative fuels).
There are no limitations regarding fuel injection and valve motion strategies. This fast response
simulation, thanks to improved or newly developed 3D-CFD-models for the description of
engine processes, ensures an efficient and reliable calculation also using coarse 3D-CFD-meshes.
Based on this approach the CPU-time can be reduced up to a factor 100 in comparison to
traditional 3D-CFD-simulations.

An integrated and automatic “evaluation tool” establishes a comprehensive analysis of the relevant engine parameters (clear representation of the results) and the “internal coupling” with the real working-process analysis (WP) allows both a supported analysis of the engine processes and a better comparison and control with test bench results and other simulation tools. Furthermore the simulation of several successive operating cycles (reduction up to completely elimination of the influence of the initial conditions) and the extension of the simulated 3D-CFD-domain up to the full engine (increasing of predictability and reduction of the influence of boundary conditions) are possible.

As introduced before, the 3D-CFD-models implemented into QuickSim do not have a general
validity for any thermodynamic investigation. Their formulation is adjusted in order to both
optimize the solution of engine processes and reduce the computational resources required for
the calculation. These models are based on a combination of different approaches (traditional
local 3D-CFD-models, engine-specific phenomenological relationships, trained neural networks,
databases and if needed empirical relationships) and take explicitly into account the cell
dimensions and cell structures.