boundary conditions

[Anonymous]

I have an industrial silencer with client given outlet conditions ie flowrate and pressure.

Working with the cfd boundary input its not a problem assigning these figures to the outlet,the problem is what do i assign to the inlet.

Do i assign the flowrate,do i assign none,there does seem to be a collection of different options.

Having chosen what i thought was correct and running a simulation i find that the flow vectors give some unexpected results.

Any idea what should be assigned to the inlet boundary.

[Jon.Wilde · Accepted solution]

Hi,

The most common set up is a flow rate at the inlet (which is the same as at the outlet if incompressible)

Pressure at the outlet, which is typically a P=0. The delta will be the same regardless of the value if incompressible.

CFD will prepdict the inlet pressure for you and that will be your system pressure drop.

Hope that helps,

Jon