I was wondering how to model a proper inlet pressure boundary condition.
I have a pipe system with an inlet flow of 400 m³/hr at around 2 bars
The output is just an outlet into the environment.
When I apply the boundary conditions I cannot map an inlet boundary condition with those two values.
I get negative pressures in the results.
inlet flow settings:
How do I model an inlet boundary condition with a volume flow AND a pressure and why do I get negative pressure on the way - even with the absolute display i get 0.1 Mpa max
You have to select only one of variables. Pressure rese and mass flow overpredict fluid flow. You can select or mass flow (rigid boundary condition) and inlet pressure will be estimated during analysis or pressure rise (soft boundary condition) and you get mass flow as result.
The pressure outputted is a gage pressure, relative too your ambient pressure.
Also like previously mentionned specifying both the pressure and volume flow rate would over constrain the problem.