Outflow vs Pressure Outlet BCs
Could someone explain to me the difference between outflow and pressure outlet boundary conditions?
I simulated a steady state flow through a straight pipe using the two different boundary conditions at the outlet, with a velocity inlet boundary condition at the inlet. I get quite different results in terms of the total pressure drop. Why is this so?
The conditions Fluent uses can be found in the manual
the outflow boundary condition is described in 7.10.1 and 7.10.2
the Pressure Outlet boundary is described in 7.8.1
taking a quick look at it i think the pressure outlet defines
(and some other things)
while in the case of an outflow a zero diffusion flux is defined for all variables
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