Learning Forum

[Dato]

Hello everyone,

I'm modeling dispersion of CO in the air. The species model without chemical reaction is used. I have specified the density of mixture material as incompressible ideal gas. The incompressible ideal gas is defined as followed as reference in user guide. However,  the "Mw", molecular weight of mixture, is not explicitly defined for users. Anyone konws how the molecular weight is calculated by fluent using incompressible ideal gas law in species model? It's not illustrated in user guide nor theory guide. 

Best regards.

[jcooper]

Hi: Dato:

The molecular weight for a mixture is calculated as the mass fraction weighted value of component molecular weights, so the equation in 8.3.6 still applies.

Regards,

Judy