The units are sort of covered here  https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v241/en/flu_udf/flu_udf_Limitations.html So I'd expect the unit to be kgmol/m3 or rather kmol/m3 as the former unit is an older Americanism for the latter. Best check would be to add another UDM and make it equal to one of the species concentrations and then compare.Â
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