Computational Fluid Dynamics (CFD) has become an essential tool in the design and development process of engineering devices. In the last decades, CFD has also become a state of the art tool for the development of internal combustion engines (IC-engines). It offers successful assessment of new technologies, e.g. new fuel preparation methods, new combustion concepts and/or alternative fuels. The simulation of an IC-engine is one of the most challenging applications of CFD modelling and it consumes a lot of computer resources. Furthermore, for an efficient simulation of more cylinders IC-engines periphery engine parts and all cylinders have to be included in calculations. Growing calculation domains increase the calculation time non-linearly and make them impracticable in the daily work of an engineer in the engine development process.
This paper covers the discussion of a methodology for the efficient CFD simulation of a 2-cylinder 2-stroke high-performance engine using the cyclic and time delayed boundary condition. This boundary condition allows a reduction of the calculation domain and therewith of the calculation time. The boundary condition data are calculated during the simulation and are set on the corresponding face in the calculated domain. The essential advantage of the boundary condition is a reduced simulation effort for cyclic and time delayed technical problems. For the IC-engine simulation, this means that the complete simulation of the 2-cylinder engine can be carried out without the geometry of the second cylinder.
Saobraćajna sredstva i transport