Hi all,

When implementing a pressure BC with the environmental option on, does star-cd automatically assumes that the pressure over that region is atmospheric pressure? if not, for the sake of clarification, do i need to specify the atmospheric pressure (101325 Pa) in the pressure section?

Also, what are the differences if i specify the pressure in the pressure BC tab and if i specify the pressure in the initialization tab? what i want to achieve is to set the pressure over some certain region (volume), which includes the boundary, to be atmospheric. am i on the right track?

please advice. thanks!

1. The pressure specified for "Pressure" regions in Star-CD is ALWAYS relative pressure referenced to Reference Pressure in Initialization and Reference Data. By default it's 1e5 Pa, so if you want atmospheric pressure in your region just set 0!

2. Environment option means that "environmental losses" will be automatically taken into account if you pressure boundary will act as inlet boundary.

All this information can be found in the manual.