Required field
Required field
Required field

# How to set Velocity Outlet Boundary Conditions?

## Question

How should I set velocity outlet boundary conditions?

## Solution

If you use Fixed value, you need to define velocity with respect to the coordinate system. This means, based on the flow direction, assign U_x, U_y, U_z and set (+) or () whether the direction is in positive or negative axis.

If you use flow rate, you need to define either

• Mass flow rate, or
• Volume flow rate

In this case, you need to define flow rate as negative to ensure that flow leaves the domain.

Important Information