[ryan_m]

Hi,

Im running 3D airfoils (NACA 0016 @ 0 degrees) using an incompressible solver (simpleFoam). The results Im getting aren't making much sense: non-symmetrical pressure distribution, the velocity at the inlet seems to be different to what I specified. I think my boundary conditions are at fault. Could someone please have a look at the following boundary conditions to see if there are any errors:

Pressure: fixedValue outlet, zeroGradient elsewhere

Velocity: fixedValue inlet, zeroGradient outlet, movingWallVelocity on boundaries and 0 at the airfoil walls

k, epsilon, nuTilda: fixedValue inlet, zeroGradient elesewhere

Any help will be much appreciated.

Ryan

[ngj]

Hi Ryan

The movingWallVelocity, is that on the side walls parallel to the longitudinal direction of the channel? I would put a symmetry condition on those walls, see e.g. User Guide sec 6.2.1.

The other boundary conditions look reasonable.

- Niels

[ryan_m]

Hi Niels,

I do have a symmetry plane in the mesh which I defined as a symmetryPlane (forgot to mention that in original post!). The movingWallVelocity is for the top, bottom and side of my domain. I am currently running the case now, Ill post another comment if my results dont work out.

Thanks for your comments.

Ryan

[pbo]

Hi Ryan,

movingWallVelocity is for moving/deforming boundaries;
for a static mesh, used fixedValue for the Velocity at the top, bottom and side boundaries if what you want is to prescribe the velocity on these patches.
However, you will be better off using the slip condition on those.

Patrick