抄録
A modified CFD code based on the KIVA family of codes incorporating several strategies for reducing the computational time required for diesel engine simulations is presented. These strategies, all of which may be applied simultaneously, include the following: (1) a dynamic maximum time step model, (2) spray models that reduce mesh dependencies, (3) a coarse axisymmetric non-polar sector mesh with relatively uniform cell sizes, (4) a parallel CHEMKIN combustion model using MPI with load balancing, and (5) a radius of influence chemistry cell grouping method. The average wall time required for a simulation of a Mitsubishi Heavy Industries heavy-duty diesel engine from IVC to EVO is reduced from 60 hours to 40 minutes through the use of 12 processors and the strategies described in this paper.
