how to setup pressure boundary conditions?
I want to use star-ccm to simulate water flowing in a duct. One side of this duct is connected with a very larger top-openned reservoir and the other side is applied with a negtive pressure [like vacuum pump] to suck water out. What kinds of pressure type should I define in inlet side at reservoir top face and outlet side ?
Thank you !!
inlet pressure outlet
outlet pressure outlet
Inlet- Velocity Inlet
Outlet: Pressure Outlet
Most convenient BC for duct flow.
So, can I set the inlet side with 1 atm total pressure as a boundary condition; and 0.95 atm static pressure pressure as outlet condition ? [reference pressure = 0 atm]
As to the pre-defined velocity, should I set it in the initial condition?
You can either do mass flow inlet or velocity inlet.
for outlet use stagnation inlet and choose a negative pressure.
pressure outlet does not work as well with negative pressures.
as far as initial conditions go: they are good for the first initial guess.
use the inlet conditions on the inlet boundary with no pressure.
set something for the reference pressure, i dont think ccm+ likes 0 reference pressure that much and adjust your outlet pressure accordingly.
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