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massless tracer for new gas species

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Helene:
Hi,

It does not seem possible to have a massless tracer for a new gas species. Works with water vapor but not with a custom species (NCl3, for example). Mass flux is specified (not mass fraction). Nevertheless, no results. Is there a special trick to know about?

thanks,

Helene

jharbold:
Read chapter 18 of the FDS user guide.

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