in case of defining a volumetric passive scalar source, is the value represent the flux per the volume of the source or the volume of the domain?
for example, the average passive scalar concentration in space with volume of 100x100x20 m3 increased from 100 mg/m3 to 300 mg/m3 within an hour,
is it correct to calculate the flux for volumetric passive scalar by dividing 200mg/m3 (the difference in the concentration) over time (60x60 s)
flux in this case equal to 0.055 mg/m3.s
or i should multiplies the value (0.055) by the volume of the domain (so flux equal 11111.11 mg/s) and then divide it over the passive source volume