A Two-Zone Multigrid Model for SI Engine Combustion Simulation Using Detailed Chemistry

Table 4

Computational time of two-zone MG model with different combination of searching levels and skipping high-temperature cells (𝑇>800 K) in the unburned region (CA=−6.3 to 70).

Case	woMG	MG2+5	MG3+5	MG4+5	MG5+5
CPU time [hrs]	173.3	29.3	29.2	28.3	27.4
Wall time [hrs]	48.6	11.9	11.6	11	10.5
Speedup	3.6	14.6	14.9	15.8	16.5