equation question

[HEROISCOMING1]

Hi~

I'm studying fds

When performing weather modeling using fds, is it correct to calculate the mass of the fluid (nitrogen, oxygen, etc. contained in the air) using the following conservation equation?

Thank you!

[drjfloyd]

The equations used by FDS are provided in the Technical Reference Guide.

[HEROISCOMING1]

Thank you for your reply... but
Even after looking at the guide, I don’t understand it very well....
Is it correct that the chemical species conservation equation in the fds program is involved in the combustion process?

[drjfloyd]

Yes. Combustion is a checmical reaction between species. If you dont know the amounts of those species present, then you can't predict the combustion.