Learning Forum

[Cabbage123]

I would really appreciate any help regarding some of the details about operating pressure and density calculation for non-premixed combustion:

1. What is the difference between the "operating pressure" set in the boundary conditions tab vs the non-premixed combustion model settings box? Do they need to be set to the same value, or can I work with 0 Pa "boundary condition" operating pressure?
2. When using the non-premixed combustion models, the system operating pressure is used to calculate density using the ideal gas law - which operating pressure is this?
3. How does this differ between adiabatic and non-adiabatic energy treatment / compressibility effects being enabled?
4. When non-adiabatic compressibility effects are enabled and the "pdf-mixture" density is set in the Create/Edit Materials box to be calculated via a cubic EOS, how is density calculated? Are the individual species densities still calculated via the ideal gas law using [p=operating pressure] and [T=temperature from look up tables]?

[Rahul Kumar]

Hello,
Please refer to these sections in Fluent user's guide : https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v212/en/flu_ug/flu_ug_sec_probdef_equil.html
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v212/en/flu_th/flu_th_uns_sec_pdf_details.html