PPM rather than kg for NOx emissions

MMatt · September 30, 2020, 08:43

In an ICE simulation I would like to check the number of NOx particles not in kg but in ppm. Is there something in the detailed soot model that I have to activate specifically?

azandian · October 1, 2020, 11:06

If you want volume/volum ppm, you can simply use the NOx mole fraction which is also reported in emissions.out. If you want mass/mass ppm, you can simply divide the mass of the NOx species (from species_mass.out) by the total mass of all the species in the domain (from thermo.out), and multiply it by 1 million.

September 30, 2020, 08:43	PPM rather than kg for NOx emissions	#1
MMatt Member MMatt Join Date: May 2013 Posts: 59 Rep Power: 12	In an ICE simulation I would like to check the number of NOx particles not in kg but in ppm. Is there something in the detailed soot model that I have to activate specifically?

October 1, 2020, 11:06		#2
azandian New Member Arash Zandian Join Date: Oct 2019 Location: Convergent Science, Madison WI Posts: 16 Rep Power: 6	If you want volume/volum ppm, you can simply use the NOx mole fraction which is also reported in emissions.out. If you want mass/mass ppm, you can simply divide the mass of the NOx species (from species_mass.out) by the total mass of all the species in the domain (from thermo.out), and multiply it by 1 million. MMatt likes this. __________________ Arash Zandian, Sr. Research engineer, Applications (608) 230-1580 convergecfd.com

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