Study on Underground Utility Tunnel Fire Characteristics under Sealing and Ventilation Conditions

Table 1

Heat release and mass source with different sizes.

Grid size (m)	Mass of fire source (g)	Theoretical heat release (kJ)	Numerical heat release (kJ)	Error (%)
0.04 × 0.04 × 0.04	244	4122	4340	5.3
0.05 × 0.05 × 0.05	220	3730	3925	5.2
0.06 × 0.06 × 0.06	202	3388	3649	7.7