channel flow: fully developed conditions
 

Hello everybody,

I am a beginner in using SU2, but not in CFD. Since one month I make some experiments with SU2 and I simulate very simple test cases, which also can be calculated analytically.

One of my first test cases was Hagen-Pouseille flow with a 2D mesh. I used:
- PHYSICAL_PROBLEM= NAVIER_STOKES
- KIND_TURB_MODEL= NONE
- MATH_PROBLEM= DIRECT
- REGIME_TYPE= INCOMPRESSIBLE
with the following boundary conditions:
- MARKER_HEATFLUX= ( wall, 0.0 )
- MARKER_SYM= ( axis )
- MARKER_INLET= ( inlet, 1000.0, 0.01, 1, 0, 0 )
- MARKER_OUTLET= ( outlet, 100000.0 )

Consequently, the mesh is rectangular and consists of: inlet (mass flow), outlet (back pressure), wall and axis (symmetry).

When I want to reach fully developed conditions, I need a very long channel/mesh.

Is there any possibility to combine periodic boundary conditions (inlet, outlet) with e.g. a mass flow inlet? In Star-CCM+, it is called a fully-developed interface with mass-flow or pressure drop option.

I tried this combination, but SU2 ignores the mass flow inlet condition and just copies the solution from the outlet to the inlet. As a consequence the initial flow velocity in the channel becomes smaller and smaller due to the friction at the wall.

I would appreciate any help.

Kind Regards.

Stefan