Im modelling a combustion case. i have calculated air fuel ratio by hand and i have found air mass flow rate 0,003268326 kg/s and fuel mass flow rate 0,000537634 kg/s. moreover, i have four air injector with dimension of 70 mm and i have defined one air inlet for all air injectors. moreover, i have six fuel injector with dimension of 42 mm and i have defined one fuel inlet for all injector. When i defined boundary conditions , should i divide total air mass flow rate to four and total fuel mass flow rate to six ? and what should i set hydraulic diameter for both air and fuel inlets.