b'Engineer Innovation | AutomotiveRate shaping the future CFD based optimization of multi-pulse injection strategies delivers a cost-efficient methodology to cope with the complexity of future gasoline direct injection combustion systems By Simon Fischer, Technical Marketing EngineerTo stay competitive with emergingdistribution and turbulence conditions alternative powertrain solutions, thefor optimum combustion performance. gasoline engine needs to undergoHowever, a reliable virtual shaping of significant improvements in thermalinjection rate profiles requires accurate efficiency and reduce particulate matterhigh-fidelity computational fluid emissions. Yet, any measure to achievedynamics (CFD) simulation technology these goals comes at the penalty ofand a robust and capable design increasing complexity of the combustionexploration tool catering for the system, implying a direct increase inautomated intelligent search of better development cost and time-to-market.strategies in a highly complex and often Therefore, a key to modern gasolineconstrained design space. As significant direct injection development is theprogress has been made in both fields ability to virtually explore more systemover the past decades and thanks to configurations and operating strategies,continuously increasing computational building less physical prototypes andpower, even a comparably reducing corresponding cost intensecomputationally expensive simulation physical testing. like in-cylinder CFD has become a candidate for true design exploration.Among the various high-potential measures to improve gasoline directBased on that engineers at Siemens injection fuel economy and reduceDigital Industries Software established a emissions is the usage of multi-pulsefully integrated CFD-based design injection strategies aimed at ideal fuelexploration methodology to find better 46'