Learning Forum

[vipul.gupta]

I am simulating fluid flow. At the inlet of domain, i am giving mass flow rate inlet boundary conditions. At outlet, I am giving pressure outlet boundary condition with a static/gauge pressure using UDF (because the outlet face has inclination) I have a query regarding the sign of pressure formulation term. Should it be negative or positive?

 

[Federico Alzamora Previtali]

Pressure in Fluent is given as gauge pressure, so it will be relative to the Operating Pressure set in Fluent. The sign will depend on this Operating Pressure.

[vipul.gupta]

Thanks for your response. 

I am using operating pressure value equal to 101325 pa. My query is on sign, 

whether I should use -dens*g*y or dens*g*y ?

I am asking because y=x[1] provide the y coordinate with sign (outlet is on the negative y) . So, should I add minus sign in the F_PROFILE formulation to make pressure positive?