Abstract
Simulation of the merging process of two diesel sprays which is a time-consuming task was accelerated using the so-called General-Purpose computing on a GPU (Graphics Processing Unit).The calculation bottleneck was identified as the deterministic judgment model of droplet collision, which seems imperative for a complicated injection system such as that of a Direct Water Injection (DWI) system. The calculation algorithm of the judgment model was carefully modified from that designed for a conventional CPU (Central Processing Unit), and the acceleration was so evident in certain cases that total calculation time was reduced down to nearly one-fourth of the equivalent CPU calculation.
